CN115358635B - Wetland change analysis method and system based on land utilization data and storage medium - Google Patents
Wetland change analysis method and system based on land utilization data and storage medium Download PDFInfo
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Abstract
The application provides a wetland change analysis method and system based on land use data and a storage medium, belonging to the technical field of wetland change analysis, wherein the wetland change analysis method based on the land use data comprises the following steps: acquiring land utilization data of the lake Taihu watershed wetland; analyzing the area change and the type change of the wetland in the Taihu lake basin through a land utilization transfer matrix according to the land utilization data to obtain an area change analysis result; and analyzing the space-time change characteristics of the wetland landscape in the Taihu lake basin through the landscape pattern index to obtain a landscape change analysis result. According to the technical scheme, the area dynamic and landscape pattern evolution characteristics of the Taihu lake basin wetland are analyzed based on the land utilization data, and a reference basis is provided for the wetland protection and recovery.
Description
Technical Field
The application relates to the technical field of wetland change analysis, in particular to a wetland change analysis method and system based on land utilization data and a storage medium.
Background
The Taihu river basin is one of the areas with the most intensive population and economic activities in China, is developed industrially and has high urbanization level, but has a lot of flood disasters, so that the wetland environmental problems caused by factors such as natural variation and human activities in the area are highly concerned, and the comprehensive control of the distribution condition, dynamic variation and driving factors of the wetland in the river basin is particularly important. However, the current wetland research on the Taihu lake watershed mainly focuses on the service function of an ecosystem, ecological health evaluation and biodiversity, and the research on the space-time change of the Taihu lake watershed wetland is less, so that the requirement on protection of the watershed wetland is difficult to meet.
Disclosure of Invention
The embodiment of the application aims to at least solve the problems that the space-time change of the Taihu lake watershed wetland is less researched and the protection requirement of the watershed wetland is difficult to meet.
Therefore, a first object of the present application is to provide a wetland change analysis method based on land use data.
A second object of the present application is to provide a wetland change analysis system based on land use data.
A third object of the present application is to provide a wetland change analysis system based on land use data.
A fourth object of the present application is to provide a readable storage medium.
In order to achieve the first object of the present application, a technical solution of a first aspect of the present invention provides a wetland change analysis method based on land use data, including: acquiring land utilization data of the lake Taihu watershed wetland; analyzing the area change and the type change of the lake Tai river basin wetland through a land utilization transfer matrix according to the land utilization data to obtain an area change analysis result; analyzing the time-space change characteristics of the wetland landscape in the Taihu lake basin through the landscape pattern index to obtain a landscape change analysis result; the land utilization data comprise wetland data and non-wetland data, the wetland data comprise paddy field data, canal data, lake data, reservoir, pit and pond data, beach data and marshland data, and the non-wetland data comprise forest land data, grassland data, construction land data, dry land data and unutilized land data.
According to the wetland change analysis method based on the land utilization data, land utilization data of the Taihu lake basin wetland is obtained firstly, the land utilization data comprises wetland data and non-wetland data, the wetland data comprises paddy field data, canal data, lake data, reservoir pit and pond data, beach data and marshland data, and the non-wetland data comprises forest land data, grassland data, construction land data, dry land data and unutilized land data. And analyzing the area change and the type change of the wetland in the Taihu lake watershed through a land utilization transfer matrix according to the land utilization data to obtain an area change analysis result, and analyzing the space-time change characteristics of the wetland landscape in the Taihu lake watershed through a landscape pattern index to obtain a landscape change analysis result. The method comprises the steps of extracting wetland type distribution data of the Taihu river basin based on land utilization data, analyzing area dynamics and landscape pattern evolution characteristics of the Taihu river basin wetland by using a land utilization transfer matrix and a landscape pattern index, and accordingly providing a reference basis for protection and recovery of the Taihu river basin wetland.
In addition, the technical scheme provided by the application can also have the following additional technical characteristics:
among the above-mentioned technical scheme, according to land use data, the area change of tai lake basin wetland, type change are analyzed through land use transfer matrix, obtain area change analysis result, specifically include: manufacturing a wetland change conversion matrix through a land utilization transfer matrix according to the land utilization data; analyzing the area change of the Taihu lake basin wetland according to the wetland change conversion matrix to obtain an area change analysis result; and analyzing the type change of the Taihu lake basin wetland according to the wetland change conversion matrix to obtain a type change analysis result.
According to the technical scheme, the area change and the type change of the Taihu lake basin wetland are analyzed through the land utilization transfer matrix according to the land utilization data to obtain an area change analysis result, and specifically, the method includes the steps of firstly, manufacturing a wetland change conversion matrix through the land utilization transfer matrix according to the land utilization data. And analyzing the area change of the Taihu lake watershed wetland according to the wetland change conversion matrix to obtain an area change analysis result, and analyzing the type change of the Taihu lake watershed wetland according to the wetland change conversion matrix to obtain a type change analysis result. The method is characterized in that a wetland change conversion matrix is manufactured based on the land utilization transfer matrix, the change space-time characteristic analysis of the Taihu lake basin wetland is carried out from two aspects of the area change and the type change of the wetland, and a reference basis can be provided for the wetland protection and recovery.
In the above technical scheme, the wetland change conversion matrix is:
wherein S represents an area, n is the number of land use types, i, j (i, j =1,2, \ 8230;, n) are land use types before and after transfer, respectively,
the area of the i-type land converted into the j-type land before the transfer.
In the technical scheme, the wetland change conversion matrix is manufactured according to a land use transfer matrix, and the land use transfer matrix is an application of a Markov model in geography and can comprehensively and specifically reflect the structural characteristics and the change direction of land use change. Each row element in the matrix represents the area flow direction of the i land class after transfer, and each column element represents the area source for generating the j land class after transfer. And the wetland change conversion matrix can be used for obtaining the wetland area change characteristics and the type change characteristics of the Taihu lake basin and calculating the interconversion area of the wetland and the non-wetland.
In the technical scheme, the space-time change characteristics of the wetland landscape of the Taihu lake basin are analyzed through the landscape pattern index to obtain a landscape change analysis result, and the method specifically comprises the following steps: analyzing the space-time change characteristics of the type level of the wetland in the Taihu lake basin through the landscape pattern index to obtain a type level change analysis result; and analyzing the time-space change characteristics of the landscape level of the wetland in the Taihu lake watershed through the landscape pattern index to obtain a landscape level change analysis result.
In the technical scheme, the space-time change characteristics of the wetland landscape in the Taihu lake watershed are analyzed through the landscape pattern index to obtain a landscape change analysis result, and specifically, the space-time change characteristics of the type level of the wetland in the Taihu lake watershed are analyzed through the landscape pattern index to obtain a type level change analysis result. And then analyzing the time-space change characteristics of the landscape level of the wetland in the Taihu lake basin through the landscape pattern index to obtain a landscape level change analysis result. The landscape pattern index is a simple quantitative index capable of highly concentrating landscape pattern information, reflecting certain aspects of characteristics of the structural composition and the spatial configuration of the landscape pattern information, developing landscape change characteristics of the Taihu lake basin landscape wetland from two aspects of type level and landscape level based on the landscape pattern index, and providing reference basis for wetland protection and restoration.
In the above technical solution, the landscape pattern index includes a plaque level index, a plaque type level index, and a landscape level index.
In the technical scheme, the landscape pattern index can be divided into a plaque level index, a plaque type level index and a landscape level index. The plaque type level index is analyzed for different types of plaques, and the landscape level index is used for describing overall characteristics of the research area.
In the above technical solution, the type level includes a plaque density, a maximum plaque index, an area-weighted average fractal dimension, and an aggregation index.
In this solution, the type level includes the plaque density, the maximum plaque index, the area-weighted average fractal dimension, and the concentration index. The patch density is used for describing the landscape crushing degree, and the larger the value is, the more the number of patches on a unit area is, and the higher the landscape crushing degree is. The maximum plaque index is used for describing the degree of occupation of the landscape by the maximum plaque and expresses the superiority of the landscape type. The area-weighted average fractal dimension is used to describe the complexity of the landscape patch shape, with values near 1 indicating a close approximation to a square and values near 2 indicating a more complex shape. The aggregation index is used for describing the aggregation degree of the types in space, and the larger the value is, the closer the plaques of the same type are, and the distribution is aggregated.
In the technical scheme, the landscape level comprises the number of patches, a landscape shape index, a shannon diversity index and a vine spread index.
In the technical scheme, the landscape level comprises the number of patches, a landscape shape index, a shannon diversity index and a tendril degree index. Wherein, the number of the patches is used for describing the landscape crushing degree, and the larger the value is, the higher the landscape crushing degree is. The landscape shape index is used to describe the shape change of the landscape, and the larger the value, the more complicated the shape. The shannon diversity index is used for describing the richness, complexity and heterogeneity of the landscape system structure composition, and the larger the value is, the more abundant and complex landscape structure composition, the high fragmentation degree and the more balanced area proportion of each patch type are shown. The spreading index is used for reflecting the agglomeration degree or extension tendency of different plaque types in the landscape, and the larger the value is, the better the landscape connectivity is.
In order to achieve the second objective of the present application, a technical solution of the second aspect of the present application provides a wetland change analysis system based on land use data, including: the acquisition module is used for acquiring the land utilization data of the lake Tai river basin wetland; the area change analysis module is used for analyzing the area change and the type change of the Taihu lake basin wetland through the land utilization transfer matrix according to the land utilization data to obtain an analysis result; and the landscape change analysis module is used for analyzing the time-space change characteristics of the wetland landscape of the Taihu lake watershed through the landscape pattern index to obtain a landscape change analysis result.
The wetland change analysis system based on the land utilization data comprises an acquisition module, an area change analysis module and a landscape change analysis module. The acquisition module is used for acquiring the land utilization data of the lake Taihu watershed wetland. The area change analysis module is used for analyzing the area change and the type change of the lake Tai river basin wetland through the land utilization transfer matrix according to the land utilization data to obtain an analysis result. The landscape change analysis module is used for analyzing the time-space change characteristics of the wetland landscape of the Taihu lake basin through the landscape pattern index to obtain a landscape change analysis result. The method comprises the steps of extracting wetland type distribution data of the Taihu river basin based on land utilization data, analyzing area dynamics and landscape pattern evolution characteristics of the Taihu river basin wetland by using a land utilization transfer matrix and a landscape pattern index, and accordingly providing a reference basis for protection and recovery of the Taihu river basin wetland.
In order to achieve the third objective of the present application, a technical solution of the third aspect of the present application provides a wetland change analysis system based on land utilization data, including: the wetland change analysis method based on the land utilization data comprises a memory and a processor, wherein the memory is stored with a program or an instruction which can be run on the processor, and the processor realizes the steps of the wetland change analysis method based on the land utilization data in any one of the technical schemes of the first aspect when executing the program or the instruction, so that the method has the technical effects of any one of the technical schemes of the first aspect, and is not repeated herein.
In order to achieve the fourth object of the present application, in a fourth aspect of the present application, a readable storage medium is provided, where a program or an instruction is stored, and the program or the instruction, when executed by a processor, implements the steps of the wetland change analysis method based on land use data in any one of the technical solutions of the first aspect, so that the method has the technical effects of any one of the technical solutions of the first aspect, and is not described herein again.
Additional aspects and advantages of the present application will be set forth in part in the description which follows, or may be learned by practice of the present application.
Drawings
The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart illustrating steps of a wetland change analysis method based on land use data according to an embodiment of the present application;
fig. 2 is a flowchart illustrating steps of a wetland change analysis method based on land use data according to an embodiment of the present application;
fig. 3 is a flowchart illustrating steps of a wetland change analysis method based on land use data according to an embodiment of the present application;
fig. 4 is a block diagram schematically illustrating the structure of a wetland change analysis system based on land use data according to another embodiment of the present application;
fig. 5 is a block diagram schematically illustrating a structure of a wetland change analysis system based on land use data according to still another embodiment of the present application.
Wherein, the correspondence between the reference numbers and the part names in fig. 4 and 5 is:
10: a wetland change analysis system based on land utilization data; 110: an acquisition module; 120: an area change analysis module; 130, 130; a landscape change analysis module; 300: a memory; 400: a processor.
Detailed Description
In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.
The wetland change analysis method and system based on land use data and the storage medium according to some embodiments of the present application are described below with reference to fig. 1 to 5.
As shown in fig. 1, the wetland change analysis method based on the land use data according to one embodiment of the present application includes the following steps:
step S102: acquiring land utilization data of the lake Taihu watershed wetland;
step S104: analyzing the area change and the type change of the wetland in the Taihu lake basin through a land utilization transfer matrix according to the land utilization data to obtain an area change analysis result;
step S106: analyzing the time-space change characteristics of the wetland landscape of the Taihu lake watershed through the landscape pattern index to obtain a landscape change analysis result;
the land utilization data comprise wetland data and non-wetland data, the wetland data comprise paddy field data, canal data, lake data, reservoir, pit and pond data, beach data and marshland data, and the non-wetland data comprise forest land data, grassland data, construction land data, dry land data and unutilized land data.
According to the wetland change analysis method based on the land utilization data, land utilization data of the Taihu lake basin wetland is obtained firstly, the land utilization data comprise wetland data and non-wetland data, the wetland data comprise paddy field data, canal data, lake data, reservoir pit and pond data, beach data and marshland data, and the non-wetland data comprise forest land data, grassland data, construction land data, dry land data and unused land data. And analyzing the area change and the type change of the wetland in the Taihu lake watershed through a land utilization transfer matrix according to the land utilization data to obtain an area change analysis result, and analyzing the space-time change characteristics of the wetland landscape in the Taihu lake watershed through a landscape pattern index to obtain a landscape change analysis result. Based on the land utilization data, extracting wetland type distribution data of the Taihu lake basin, and analyzing the area dynamics and landscape pattern evolution characteristics of the Taihu lake basin wetland by using a land utilization transfer matrix and a landscape pattern index, thereby providing a reference basis for the protection and recovery of the Taihu lake basin wetland.
As shown in fig. 2, according to the wetland change analysis method based on the land utilization data provided by the present application, the area change and the type change of the wetland in the lake tai river basin are analyzed through the land utilization transfer matrix according to the land utilization data, so as to obtain an area change analysis result, which specifically includes the following steps:
step S202: manufacturing a wetland change conversion matrix through a land utilization transfer matrix according to the land utilization data;
step S204: analyzing the area change of the Taihu lake basin wetland according to the wetland change conversion matrix to obtain an area change analysis result;
step S206: and analyzing the type change of the lake Tai watershed wetland according to the wetland change conversion matrix to obtain a type change analysis result.
In the embodiment, the area change and the type change of the lake Taihu watershed wetland are analyzed through the land utilization transfer matrix according to the land utilization data to obtain an area change analysis result, and specifically, the method comprises the steps of firstly manufacturing a wetland change conversion matrix through the land utilization transfer matrix according to the land utilization data. And analyzing the area change of the Taihu lake watershed wetland according to the wetland change conversion matrix to obtain an area change analysis result, and analyzing the type change of the Taihu lake watershed wetland according to the wetland change conversion matrix to obtain a type change analysis result. The method is characterized in that a wetland change conversion matrix is manufactured based on the land utilization transfer matrix, the change space-time characteristic analysis of the Taihu lake basin wetland is carried out from two aspects of the area change and the type change of the wetland, and a reference basis can be provided for the wetland protection and recovery.
Further, the wetland change conversion matrix is as follows:
wherein S represents an area, n is the number of land use types, i, j (i, j =1,2, \ 8230;, n) are land use types before and after transfer, respectively,
area for transition from i class to j class before transition. The wetland change conversion matrix is manufactured according to a land use transfer matrix, and the land use transfer matrix is an application of a Markov model in geography and can comprehensively and specifically reflect the structural characteristics and the change direction of land use change. Each row element in the matrix represents the area flow direction of the i land class after transfer, and each column element represents the area source for generating the j land class after transfer. And the wetland change conversion matrix can be used for obtaining the wetland area change characteristics and the type change characteristics of the Taihu lake basin and calculating the interconversion area of the wetland and the non-wetland.
As shown in fig. 3, the space-time variation characteristics of wetland landscape in the lake Taihu watershed are analyzed through the landscape pattern index to obtain a landscape variation analysis result, and the method specifically comprises the following steps:
step S302: analyzing the space-time change characteristics of the type level of the wetland in the Taihu lake basin through the landscape pattern index to obtain a type level change analysis result;
step S304: and analyzing the space-time change characteristics of the landscape level of the wetland in the Taihu lake basin through the landscape pattern index to obtain a landscape level change analysis result.
In the embodiment, the space-time change characteristics of the wetland landscape of the Taihu lake watershed are analyzed through the landscape pattern index to obtain a landscape change analysis result, and specifically, the space-time change characteristics of the type level of the wetland of the Taihu lake watershed are analyzed through the landscape pattern index to obtain a type level change analysis result. And then analyzing the time-space change characteristics of the landscape level of the wetland in the Taihu lake basin through the landscape pattern index to obtain a landscape level change analysis result. The landscape pattern index is a simple quantitative index capable of highly concentrating landscape pattern information, reflecting certain aspects of characteristics of the structural composition and the spatial configuration of the landscape pattern information, developing landscape change characteristics of the Taihu lake basin landscape wetland from two aspects of type level and landscape level based on the landscape pattern index, and providing reference basis for wetland protection and restoration.
In the above embodiments, the landscape configuration index may be divided into a plaque level index, a plaque type level index, and a landscape level index. The plaque type level index is used for analyzing different types of plaques, and the landscape level index is used for describing overall characteristics of the research area.
In some embodiments, the type levels include plaque density, maximum plaque index, area-weighted average fractal dimension, and aggregate index. The patch density is used for describing landscape crushing degree, and the larger the value is, the more the number of patches on a unit area is, and the higher the landscape crushing degree is. The maximum plaque index is used for describing the degree of the landscape occupied by the maximum plaque and expresses the dominance of the landscape type. The area-weighted average fractal dimension is used to describe the complexity of the landscape patch shape, with values near 1 indicating a close approximation to a square and values near 2 indicating a more complex shape. The aggregation index is used for describing the aggregation degree of the types in space, and the larger the value is, the closer the plaques of the same type are, and the distribution is aggregated.
In some embodiments, the landscape level includes a number of patches, a landscape shape index, a shannon diversity index, and a vine spread index. The number of the spots is used for describing the landscape crushing degree, and the larger the value is, the higher the landscape crushing degree is. The landscape shape index is used to describe the shape change of the landscape, and the larger the value, the more complicated the shape. The shannon diversity index is used for describing the richness, complexity and heterogeneity of the landscape system structure composition, and the larger the value is, the more abundant and complex landscape structure composition, the high fragmentation degree and the more balanced area proportion of each patch type are shown. The popularity index is used for reflecting the agglomeration degree or the extension trend of different plaque types in the landscape, and the larger the value is, the better the landscape connectivity is.
As shown in fig. 4, an embodiment of the second aspect of the present application provides a wetland change analysis system 10 based on land use data, including: the acquisition module 110 is used for acquiring the land utilization data of the lake Taihu watershed wetland; the area change analysis module 120 is used for analyzing the area change and the type change of the lake Taihu watershed wetland through a land utilization transfer matrix according to the land utilization data to obtain an analysis result; and the landscape change analysis module 130 is used for analyzing the time-space change characteristics of the wetland landscape in the Taihu lake watershed through the landscape pattern index to obtain a landscape change analysis result.
In this embodiment, the wetland change analysis system 10 based on land use data includes an acquisition module 110, an area change analysis module 120, and a landscape change analysis module 130. The acquisition module 110 is used for acquiring the land utilization data of the lake Taihu watershed wetland. The area change analysis module 120 is used for analyzing the area change and the type change of the lake Taihu watershed wetland according to the land utilization data through a land utilization transfer matrix to obtain an analysis result. The landscape change analysis module 130 is used for analyzing the time-space change characteristics of the wetland landscape in the lake Taihu river basin through the landscape pattern index to obtain a landscape change analysis result. The method comprises the steps of extracting wetland type distribution data of the Taihu river basin based on land utilization data, analyzing area dynamics and landscape pattern evolution characteristics of the Taihu river basin wetland by using a land utilization transfer matrix and a landscape pattern index, and accordingly providing a reference basis for protection and recovery of the Taihu river basin wetland.
As shown in fig. 5, an embodiment of the third aspect of the present application provides a wetland change analysis system 10 based on land use data, including: the storage 300 and the processor 400, wherein the storage 300 stores a program or an instruction that can be executed on the processor 400, and the processor 400 implements the steps of the wetland change analysis method based on land utilization data in any one of the embodiments of the first aspect when executing the program or the instruction, so that the method has the technical effects of any one of the embodiments of the first aspect, and is not described herein again.
An embodiment of the fourth aspect of the present application provides a readable storage medium, on which a program or an instruction is stored, and the program or the instruction, when executed by a processor, implements the steps of the wetland change analysis method based on land utilization data in any embodiment of the first aspect, so that the method has the technical effects of any embodiment of the first aspect, and is not described herein again.
In this application, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (4)
1. A wetland change analysis method based on land utilization data is characterized by comprising the following steps:
acquiring land utilization data of the lake Taihu watershed wetland;
analyzing the area change and the type change of the lake Tai watershed wetland through a land utilization transfer matrix according to the land utilization data to obtain an area change analysis result;
analyzing the time-space change characteristics of the wetland landscape of the Taihu lake watershed through the landscape pattern index to obtain a landscape change analysis result;
the land utilization data comprises wetland data and non-wetland data, the wetland data comprises paddy field data, canal data, lake data, reservoir and pond data, beach data and marshland data, and the non-wetland data comprises forest land data, grassland data, construction land data, dry land data and unused land data;
analyzing the area change and the type change of the lake Tai watershed wetland through a land utilization transfer matrix according to the land utilization data to obtain an area change analysis result, which specifically comprises the following steps:
manufacturing a wetland change conversion matrix through a land utilization transfer matrix according to the land utilization data;
analyzing the area change of the Taihu lake basin wetland according to the wetland change conversion matrix to obtain an area change analysis result;
analyzing the type change of the Taihu lake basin wetland according to the wetland change conversion matrix to obtain a type change analysis result;
the wetland change conversion matrix is as follows:
wherein S represents an area, n is a number of land use types, i, j (i, j =1,2, \ 8230;, n)Respectively pre-transfer and post-transfer land use types,
the area of i land class is changed into j land class before transfer; the wetland change conversion matrix is manufactured according to the land use transfer matrix, and the land use transfer matrix is an application of a Markov model in geography and can comprehensively and specifically reflect the structural characteristics and the change direction of land use change; each row of elements in the matrix represents the area flow direction of the i land class after transfer, and each column of elements represents an area source for generating the j land class after transfer; through the wetland change conversion matrix, the area change characteristics and the type change characteristics of the Taihu lake basin wetland can be obtained, and the interconversion area of the wetland and the non-wetland is calculated;
the method for analyzing the space-time change characteristics of the wetland landscape in the Taihu lake basin through the landscape pattern index to obtain the landscape change analysis result specifically comprises the following steps:
analyzing the space-time change characteristics of the type level of the wetland in the Taihu lake basin through the landscape pattern index to obtain a type level change analysis result;
analyzing the space-time change characteristics of the landscape level of the wetland in the Taihu lake basin through the landscape pattern index to obtain a landscape level change analysis result;
the landscape pattern index comprises a plaque level index, a plaque type level index and a landscape level index; the plaque type level index is analyzed for different types of plaques, and the landscape level index is used for describing the overall characteristics of the research area;
the type level comprises plaque density, maximum plaque index, area weighted average fractal dimension and aggregation index; the patch density is used for describing landscape crushing degree, and the larger the value is, the more the number of patches on a unit area is, and the higher the landscape crushing degree is; the maximum plaque index is used for describing the degree of the landscape occupied by the maximum plaque and expressing the dominance degree of the landscape type; the area-weighted average fractal dimension is used for describing the complexity of the shape of the landscape plaque, the value close to 1 indicates that the shape is close to a square, and the value close to 2 indicates that the shape is more complex; the aggregation index is used for describing the aggregation degree of the types in space, and the larger the value is, the closer the plaques of the same type are, the more the distribution is aggregated;
the landscape level comprises the number of patches, a landscape shape index, a shannon diversity index and a tendril degree index; the number of the patches is used for describing the landscape crushing degree, and the larger the value is, the higher the landscape crushing degree is; the landscape shape index is used for describing the shape change of the landscape, and the larger the value is, the more complex the shape is; the shannon diversity index is used for describing the richness, complexity and heterogeneity of the landscape system structure composition, and the larger the value is, the more abundant and complicated landscape structure composition is shown, the high fragmentation degree is shown, and the area proportion of each patch type is more balanced; the spreading index is used for reflecting the agglomeration degree or extension tendency of different plaque types in the landscape, and the larger the value is, the better the landscape connectivity is.
2. A wetland change analysis system based on land use data is characterized by comprising:
the acquisition module (110) is used for acquiring the land utilization data of the wetland of the Taihu lake basin;
the area change analysis module (120) is used for analyzing the area change and the type change of the lake Tai flowing water wetland through a land utilization transfer matrix according to the land utilization data to obtain an analysis result;
the landscape change analysis module (130) is used for analyzing the time-space change characteristics of the wetland landscape of the Taihu lake basin through the landscape pattern index to obtain a landscape change analysis result;
the land utilization data comprises wetland data and non-wetland data, the wetland data comprises paddy field data, canal data, lake data, reservoir and pond data, beach data and marshland data, and the non-wetland data comprises forest land data, grassland data, construction land data, dry land data and unused land data;
the area change analysis module (120) is specifically configured to:
manufacturing a wetland change conversion matrix through a land utilization transfer matrix according to the land utilization data;
analyzing the area change of the Taihu lake basin wetland according to the wetland change conversion matrix to obtain an area change analysis result;
analyzing the type change of the Taihu lake basin wetland according to the wetland change conversion matrix to obtain a type change analysis result;
the wetland change conversion matrix is as follows:
wherein S represents the area, n is the number of land use types, i and j (i, j =1,2, \8230; n) are the land use types before and after the transfer respectively,
the area of the i land class is changed into the j land class before transfer; the wetland change conversion matrix is manufactured according to the land use transfer matrix, and the land use transfer matrix is an application of a Markov model in geography and can comprehensively and specifically reflect the structural characteristics and the change direction of land use change; each row of elements in the matrix represents the area flow direction of the i land class after transfer, and each column of elements represents an area source for generating the j land class after transfer; through the wetland change conversion matrix, the area change characteristics and the type change characteristics of the lake Taihu watershed wetland can be obtained, and the interconvertible area of the wetland and the non-wetland is calculated;
the landscape change analysis module (130) is specifically configured to:
analyzing the space-time change characteristics of the type level of the wetland in the Taihu lake basin through the landscape pattern index to obtain a type level change analysis result;
analyzing the time-space change characteristics of the landscape level of the wetland in the Taihu lake watershed through the landscape pattern index to obtain a landscape level change analysis result;
the landscape pattern index comprises a plaque level index, a plaque type level index and a landscape level index; the plaque type level indexes are analyzed for different types of plaques, and the landscape level indexes are used for describing overall characteristics of the research area;
the type level comprises plaque density, maximum plaque index, area weighted average fractal dimension and aggregation index; the patch density is used for describing landscape crushing degree, and the larger the value is, the more the number of patches on a unit area is, and the higher the landscape crushing degree is; the maximum plaque index is used for describing the degree of the landscape occupied by the maximum plaque and expressing the dominance degree of the landscape type; the area-weighted average fractal dimension is used for describing the complexity of the shape of the landscape plaque, the value close to 1 indicates that the shape is close to a square, and the value close to 2 indicates that the shape is more complex; the aggregation degree index is used for describing the aggregation degree of the types in space, and the larger the value is, the closer the plaques of the same type are, the distribution aggregation is shown;
the landscape level comprises the number of patches, a landscape shape index, a shannon diversity index and a tendril degree index; the number of the patches is used for describing the landscape crushing degree, and the larger the value is, the higher the landscape crushing degree is; the landscape shape index is used for describing the shape change of the landscape, and the larger the value is, the more complex the shape is; the shannon diversity index is used for describing the richness, complexity and heterogeneity of the landscape system structure composition, and the larger the value is, the more rich and complex the landscape structure composition is, the high fragmentation degree is shown, and the area proportion of each patch type is more balanced; the spreading index is used for reflecting the agglomeration degree or extension tendency of different plaque types in the landscape, and the larger the value is, the better the landscape connectivity is.
3. A wetland change analysis system based on land use data, characterized by comprising:
a memory (300) and a processor (400), wherein the memory (300) has stored thereon a program or instructions executable on the processor (400), the processor (400) when executing the program or instructions implementing the steps of the land use data based wetland change analysis method of claim 1.
4. A readable storage medium on which a program or instructions are stored, wherein the program or instructions, when executed by a processor, implement the steps of the land use data-based wetland change analysis method according to claim 1.
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