CN115577825A - Method for determining width of urban ecological corridor depending on river and road - Google Patents
Method for determining width of urban ecological corridor depending on river and road Download PDFInfo
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Abstract
The invention relates to a method for determining the width of an urban ecological corridor depending on rivers and roads, which comprises the following steps: acquiring geographic information data of a target area and preprocessing the geographic information data; constructing an ecological source region screening index system to screen out an ecological source region; constructing a comprehensive resistance surface; determining a potential corridor path between any two ecological sources; identifying a current density map of a region of the potential corridor path having significant connectivity to animal migration; superposing the river and road layer data with a current density map, extracting a buffer area with the width of 100m and calculating the average value of the current density to obtain a buffer area layer with current information; presetting a minimum width, dividing the buffer area into a plurality of stages according to the average current density value, extracting galleries corresponding to the buffer area, and endowing each gallery with the minimum width corresponding to the corresponding stage according to the preset value. The invention determines the width grade of the urban corridor according to the current density, and is beneficial to determining the width range of the urban ecological corridor depending on rivers and roads.
Description
Technical Field
The invention relates to the field of ecological environment, in particular to a method for determining the width of an urban ecological corridor depending on rivers and roads.
Background
The rapid urbanization leads to the problems of the reduction of biodiversity in urbanized areas and the like, and the contradiction between urban ecological protection and urban development is aggravated. The scientific planning and construction of the urban ecological corridor is an effective way for solving the problem. The construction of the urban ecological corridor is an important step for the implementation of urban ecological space planning under the national space planning, is an important way for protecting variety diversity, improving urban and rural landscape quality, improving public recreation space and improving the service value of an ecological system, and is also a key link for promoting urban and rural coordination, harmony between human and nature and improvement of the ecological system.
Due to the linear structure of the urban ecological corridor, species diversity and ecological benefits are affected by the corridor width. From the perspective of landscape ecology, the wider the ecological corridor is, the more obvious the ecological effect is; the ecological corridor is too narrow and the corridor is greatly influenced by human activities. However, from the animal and plant research point of view, the wider the corridor is, the more favorable the corridor is, the too wide the corridor is not favorable for the rapid migration of organisms, and an appropriate width value is required. The range of the ecological corridor is too large, which can cause the waste of homeland resources, and the ecological corridor is too narrow, which is not beneficial to the development of ecological space. In urban areas, ecological galleries are mostly attached to linear spatial layout of rivers, roads and the like, the urban ecological gallery width is unclear, the efficiency of an urban ecological network is limited, and the width definition of the urban ecological gallery is one of the problems to be solved urgently.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for determining the width of an urban ecological corridor depending on rivers and roads, which is suitable for determining the width of the urban ecological corridor depending on the rivers and the roads.
The technical purpose of the invention is realized by the following technical scheme:
a method for determining the width of an urban ecological corridor depending on rivers and roads comprises the following steps:
step 3, combining the land utilization type and the NDVI to construct a comprehensive resistance surface;
and 7, presetting the minimum width corresponding to each grade, dividing all buffer areas with current information into a plurality of grades according to the average current density value by a natural breakpoint method, sequentially descending grades from the highest grade according to the grades of the buffer areas to extract the buffer areas, obtaining galleries corresponding to the extracted buffer areas, and endowing each gallery with the minimum width corresponding to the corresponding grade according to the preset value.
Further, in step 2, the urban green land is extracted through ArcGIS, the urban green land larger than 5ha in the urban green land is used as a pre-selected urban ecological source land, and the ecological source land is identified from the pre-selected urban ecological source land through constructing an ecological source land screening index system.
Furthermore, the ecological source ground screening index system comprises four factors of vegetation quality, connectivity index, cold island effect index and area, the four factors are respectively graded and then weighted and overlapped, and the ecological source ground is screened out from the weighted and overlapped result according to a preset threshold value.
Further, in step 3, all factors of the land use type are subjected to weighted assignment, and the land use type and the NDVI image are superposed to obtain a comprehensive resistance surface.
Further, in step 4, the comprehensive resistance surface and the ecological source are imported into the Linkage Mapper, the ecological source and the resistance surface are selected, and a potential corridor path between any two ecological source areas is determined based on the minimum cumulative resistance model.
Further, a potential corridor path between any two ecological sources is determined by simulating a minimum cost path between the ecological sources by means of the MCR model,
wherein f represents a minimum cumulative resistance value, D ij Represents fromSpatial distance, R, from ecological source j to spatial cell i i Representing the drag coefficient of cell i. .
Further, in step 5, based on a circuit theory, inputting data of an ecological source and comprehensive resistance surface by using a Pinchpoint tool, setting a cost weighted distance as a threshold, and operating the Pinchpoint tool to identify a high current density area in a potential ecological corridor to obtain a current density map.
Compared with the prior art, the invention has the beneficial effects that:
(1) The method for determining the width of the urban ecological corridor depending on the river and the road determines the width grade of the urban corridor according to the current density, determines the urgency of ecological restoration of linear spaces such as different rivers and roads and the like, and is favorable for determining the width range of the urban ecological corridor depending on the river and the road.
(2) The method takes the urban river and road linear space data as the alternative paths of the urban ecological galleries, and is maximally suitable for the current situation that the urban existing galleries are mostly built depending on the linear spaces such as rivers, roads and the like on the aspect of urban planning.
(3) According to the method, the ecological source land is identified by coupling the land utilization type and the NDVI, and the ecological benefit differences of different land types are considered on the basis of considering the current land state of the urbanization condition.
(4) In the prior art, the substance flow in the ecological network is mostly covered, the invention explores the animal migration process of the urban potential ecological corridor through the circuit theory, and considers the animal migration requirement for realizing the accurate guidance of the construction of the urban ecological corridor.
Drawings
FIG. 1 is a map of the ecological source selected in the example of the present invention.
FIG. 2 is a composite resistance surface distribution plot for an embodiment of the present invention.
Fig. 3 is a schematic diagram of a potential gallery distribution in an embodiment of the invention.
FIG. 4 is a schematic view of the ecological source distribution in the embodiment of the present invention.
FIG. 5 is a current density graph in an embodiment of the invention.
Fig. 6 is a schematic width diagram of an urban ecological corridor depending on roads and rivers in an embodiment of the invention.
Detailed Description
The technical scheme of the invention is further described by combining the specific embodiments as follows:
a method for determining the width of an urban ecological corridor depending on rivers and roads takes the Min-river region in the overseas market as an example, and comprises the following steps of:
the method comprises the steps of extracting urban green lands through ArcGIS, taking the urban green lands larger than 5ha in the urban green lands as pre-selected urban ecological source lands, and identifying the ecological source lands from the pre-selected urban ecological source lands by constructing an ecological source land screening index system. The ecological source screening index system comprises four factors of vegetation quality, connectivity index, cold island effect index and area, the four factors are respectively divided into 10 levels and then subjected to weighted superposition, and the ecological source is screened out from weighted superposition results according to a preset threshold value, in the embodiment, the pre-selected urban ecological source of the first 3 levels is screened out as the ecological source, and finally 39 ecological source are screened out, as shown in fig. 1.
Step 3, combining the land utilization type and the NDVI to construct a comprehensive resistance surface;
land use types include ecospaces and non-ecospaces: in the ecological space, the ecological barrier property of woodland, greenbelt, wetland, grassland and garden land is small; rivers, lakes and reservoirs are usually difficult to surmount, and the assistance value is relatively large;
in the non-ecological space, the ecological barrier property of residential land, road land, industrial and mining land, storage land and the like is relatively high; non-ecological space with high ecological barrier performance, such as expressway and high speed railway.
And (3) weighting and assigning values to all factors of the land use type, and superposing the land use type and the image of the NDVI to obtain a comprehensive resistance surface, wherein the deeper the color is, the larger the resistance value is, as shown in FIG. 2.
And 4, importing the comprehensive resistance surface data and the ecological source data into a Linkage Mapper, selecting an ecological source and a resistance surface, and determining a potential corridor path between any two ecological source areas based on a minimum cumulative resistance model, as shown in fig. 3.
A potential corridor path between any two ecological sources is determined by simulating a minimum cost path between the ecological sources by means of an MCR model,
wherein f represents a minimum cumulative resistance value, D ij Represents the spatial distance, R, from the ecological source j to the spatial cell i i Representing the drag coefficient of cell i.
And 5, based on a circuit theory, inputting data of an ecological source area and a comprehensive resistance surface by using a Pinchpoint tool, setting a cost weighted distance as a threshold value, and operating the Pinchpoint tool to identify a high current density area in the potential ecological corridor to obtain a current density map, wherein the current density map is shown in fig. 4.
And 6, superposing the river and road layer data and the current density map, extracting a buffer area with the width of 100m along the river and road data, and calculating the average value of the current density in the buffer area by using a partition statistical tool in ArcGIS to obtain a buffer area layer with current information, wherein the buffer area layer is shown in FIG. 5.
And 7, presetting the minimum width corresponding to each grade, dividing all buffer areas with current information into a plurality of grades according to the current density average value by a natural breakpoint method, sequentially descending the grades from the highest grade according to the grades of the buffer areas for buffer area extraction to obtain galleries corresponding to the extracted buffer areas, inputting the preset values into a GIS platform, and making the buffer areas with corresponding widths by means of buffer area tools to form a gallery boundary with the minimum width.
In the embodiment, galleries corresponding to the buffer areas of the first 5 levels are extracted, the minimum widths of the galleries corresponding to the buffer areas of the first 5 levels are preset to be 30m, 60m, 100m, 150m and 200m respectively, and the wider the width is when the current density is higher; dividing all buffer area image layers with current information into 10 grades by a natural breakpoint method, extracting the buffer areas of the first 5 grades, removing galleries with relatively low current density, and giving each gallery a corresponding minimum width according to a preset minimum width value, as shown in fig. 6.
The present invention is further explained and not limited by the embodiments, and those skilled in the art can make various modifications as necessary after reading the present specification, but all the embodiments are protected by the patent law within the scope of the claims.
Claims (7)
1. A method for determining the width of an urban ecological corridor depending on rivers and roads is characterized by comprising the following steps:
step 1, obtaining geographic information data of a target area, wherein the geographic information data comprises vector boundary layer data, land utilization vector layer data and river and road layer data, and cutting and aggregating the layers of the geographic information data;
step 2, constructing an ecological source region screening index system, and identifying an ecological source region through the ecological source region screening index system;
step 3, combining the land utilization type and the NDVI to construct a comprehensive resistance surface;
step 4, importing the comprehensive resistance surface data and the ecological source data into a Linkage Mapper, and determining a potential corridor path between any two ecological source areas;
step 5, based on a circuit theory, identifying an area with an important connectivity effect on animal migration in a potential corridor path by using a Pinchpoint tool to obtain a current density graph;
step 6, superposing the river and road layer data with a current density map, extracting a buffer area with the width of 100m along the river and road data, and calculating the average value of the current density in the buffer area by using a subarea statistical tool to obtain a buffer area layer with current information;
and 7, presetting the minimum width corresponding to each grade, dividing all buffer areas with current information into a plurality of grades according to the current density average value by a natural breakpoint method, sequentially stepping down from the highest grade according to the grades of the buffer areas to extract the buffer areas, obtaining galleries corresponding to the extracted buffer areas, and endowing each gallery with the minimum width corresponding to the corresponding grade according to the preset value.
2. The method for determining the width of the urban ecological corridor relying on rivers and roads as claimed in claim 1, wherein in the step 2, the urban green lands are extracted through ArcGIS, the urban green lands with the height of more than 5ha in the urban green lands are used as pre-selected urban ecological source lands, and the ecological source lands are identified from the pre-selected urban ecological source lands by constructing an ecological source land screening index system.
3. The method for determining the width of the urban ecological corridor relying on rivers and roads according to claim 2, wherein the ecological source ground screening index system comprises four factors of vegetation quality, connectivity index, cold island effect index and area, the four factors are respectively graded and then weighted and overlapped, and the ecological source ground is screened out from the weighted and overlapped result according to a preset threshold value.
4. The method for determining the width of the urban ecological corridor relying on rivers and roads according to claim 1, wherein in the step 3, all factors of the land use type are subjected to weighted assignment, and the land use type and the image of the NDVI are overlaid to obtain a comprehensive resistance surface.
5. The method for determining the width of the urban ecological corridor relying on rivers and roads according to the claim 1, wherein in the step 4, the comprehensive resistance surface and the ecological source ground are led into a Linkage Mapper, the ecological source ground and the resistance surface are selected, and a potential corridor path between any two ecological source grounds is determined based on a minimum cumulative resistance model.
6. The method for determining the width of an urban ecological corridor relying on rivers and roads according to claim 5, wherein a potential corridor path between any two ecological sources is determined by simulating a minimum cost path between the ecological sources by means of an MCR model,
wherein f represents a minimum cumulative resistance value, D ij Represents the spatial distance, R, from the ecological source j to the spatial cell i i Representing the drag coefficient of cell i.
7. The method for determining the width of the urban ecological corridor relying on rivers and roads according to claim 1, wherein in the step 5, on the basis of circuit theory, a Pinchpoint tool is used for inputting ecological source ground and comprehensive resistance surface data, a cost weighted distance is set as a threshold value, and the Pinchpoint tool is operated to identify a high current density area in a potential ecological corridor to obtain a current density map.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116307400A (en) * | 2023-04-03 | 2023-06-23 | 吉林省林业科学研究院 | Method and device for identifying habitat corridor, electronic equipment and medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116307400A (en) * | 2023-04-03 | 2023-06-23 | 吉林省林业科学研究院 | Method and device for identifying habitat corridor, electronic equipment and medium |
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