CN101968874A - Identification technology of surface-water body vegetation importance value of lake swampiness degree - Google Patents
Identification technology of surface-water body vegetation importance value of lake swampiness degree Download PDFInfo
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- CN101968874A CN101968874A CN2010102730458A CN201010273045A CN101968874A CN 101968874 A CN101968874 A CN 101968874A CN 2010102730458 A CN2010102730458 A CN 2010102730458A CN 201010273045 A CN201010273045 A CN 201010273045A CN 101968874 A CN101968874 A CN 101968874A
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Abstract
The invention relates to an identification technology for confirming the lake swampiness degree importance value of main aquatic vegetation. The invention analyzes and reconstructs factors by researching the decomposition rates of dominant species, objectively identifies the lake swampiness degree importance value of different kinds of aquatic vegetation by combining with the main index of vegetation distribution and confirms dominant marsh plants in a region. Compared with the prior art, the invention effectively integrates the structure and characteristic information of plants in a researched region and improves the regional identification rate. Compared with a traditional method of empowering weighted values by the qualitative analysis of a single plant community for water implementation, the invention more accurately reflects the contribution rates of different plants to the swampiness of grass-type lakes, enhances the scientificity and the rationality of swampiness degree judgment and provides a basis for predicting and controlling the lake swampiness.
Description
Technical field
The present invention relates to a kind of identification technique of determining main aquatic vegetation lakes and swamps degree importance value, be by after the analysis to the decomposition of the main hydrophyte in lake, the speed of depositing, the principal character index that distributes with plant combines, reflect the method for different plants, for the bogginess prediction in careless type lake and improvement provide the basis to the bogginess contribution rate.
Background technology
The lake as the body of contacting directly of atmospheric water, surface water and underground water exchange, is very important link in the global hydrology cyclic process.Difference according to the development stage of succession can be divided into the lake careless type lake and algae type lake two big classes.Grass type lake is meant the ecosystem-type with a large amount of aquatic vascular plants, because its pasture and water are abundant, water quality is good, the species Stability Analysis of Structures, and bio-diversity is good, thereby has comparatively superior natural ecosystems service function and higher social economic value.
Under state of nature, careless type lake often needs generally to need more than one thousand years or longer through time slowly for a long time, finishes the lake growth extinction periodic process by poor nutrition-nutrition-eutrophy-bogginess.Yet, in recent years because climate change and interference of human activities have surpassed the ability of regulation and control of careless type lake ecosystem own, havoc the balance of material cycle and energy Flow, cause the hydrophyte undue growth, the lakes and swamps degree is accelerated, and the lakebed alluvial is serious, and bio-diversity is on the hazard, havoc the ecosystem structure of lake and marshland, weakened the Wetland ecological value of services.Therefore, to careless type lakes and swamps deciding degree, predict and be controlled to for the present stage problem demanding prompt solution.
The generation of grass type lakes and swamps may appear at bottom, and the top layer is perhaps in the water body.For the bogginess in top layer and the water body, the main advantage marsh plant of determining to promote the lakes and swamps process; For the bottom bogginess, mainly study the equilibrium relation of swamp vegetation bioaccumulation and decomposition rate.Because the trophic level in lake improves fast, make hygrophyte, emergent aquactic plant, floatingleaved plant and submerged plant progressively cover whole lake surface, increased the biomass of hydrophyte greatly, and its residual body decomposition amount in dead back is far below falling into water body litter semi-invariant, make biofouling serious, the rapid bogginess in lake.Therefore, in the well-developed careless type of aquatic vegetation lake, degree of peat formation not only need be considered the alluvial of silt, also will be in conjunction with the biofouling of aquatic vegetation.In traditional lakes and swamps deciding degree, vegetation alluvial index is normally according to vegetation type, very water, floating leaf, heavy water carried out simple bogginess rank determine that plant classification is thicker, decomposition, the alluvial speed of having ignored different plants are different, thereby cause the discrimination in zone low; Simultaneously, the bogginess contribution rate of each kind of plant of qualitative analysis is carried out weight assignment to it, and subjectivity is more intense, and confidence level is lower, but causes analyzing unilateral, degree of accuracy and practicality reduces.
Summary of the invention
The objective of the invention is: at the architectural feature consideration deficiency definite in the existing lakes and swamps decision technology the vegetation index, the technology of the different plants of a kind of identification to bogginess contribution importance value is provided, by analyzing the decomposition difference of the main aquatic vegetation of top layer-water body, draw the alluvial coefficient of different plants, in conjunction with its distribution characteristics, effectively the different plants of reflection are to the contribution margin of careless type lakes and swamps, thereby strengthen science and rationality that degree of peat formation is judged, but improve prediction and the precise control and the practicality of lakes and swamps.
For achieving the above object, technical scheme of the present invention is: by the research to the decomposition alluvial of the main residual body of hydrophyte in the top layer in careless type lake and the water body, obtain the alluvial coefficient of different plants, and in conjunction with the principal character index of vegetation, vegetation is determined the advantage marsh plant of this area to the importance value of lakes and swamps in the Research on Identification district.
Concrete steps are as follows:
(1) by mainly building the mass-planting quilt in the top layer-water body in on-the-spot investigation Research on Identification zone, determines the overall target of plant distribution characteristics.
For the bogginess type of aquatic vegetation excessive multiplication in top layer and the water body, be its space distribution state of synthesis display, aquatic vegetation is carried out the feature investigation, the investigation index of emergent aquactic plant is height, density, cover degree, frequency and biomass; Group's investigation index of floatingleaved plant is density, cover degree, frequency and biomass; The submerged plant investigation index is frequency and biomass, final overall target (P by distribution characteristics
Zzh), i.e. the mean value of each investigation index relative value reflection.
The overall target of plant distribution characteristics is big more, represents the big more at this study area proportion of this kind of plant, also may be big more to the contribution of degree of peat formation.
(2) carry out field trial or literature survey, determine mainly to build the residual body coefficient of dissociation of mass-planting thing.
Pertinent literature shows that the resolution ratio of plant residue meets unsophisticated logarithmic equation, that is:
In(M
t/M
0)＝-kt (1)
M wherein
t(g) and M
0(g) be respectively plant weight and plant initial weight in the time of t days, k is a coefficient of dissociation, and coefficient of dissociation is more little, illustrates to reduce fewly more in search time implants quality, and plant is difficult decomposes.
Therefore the mass-planting thing of mainly building of research area is carried out decomposition experiment on the spot, simulate the decomposable process that rots naturally of aquatic plant residue, the reduction of periodic monitor plant is perhaps carried out the pertinent literature investigation, determines the coefficient of dissociation of plant.
(3) utilize the residual body coefficient of dissociation of step (2), carry out the factor and rebuild, the importance value and the advantage marsh plant of the degree of peat formation of different plants determined in identification.
Change the plant coefficient of dissociation of gained, obtain the relative biofouling coefficient (A) of different plants:
I, n=1,2 ..., m, wherein 1,2 ..., on behalf of the difference in 1～m kind study area, m build the mass-planting thing.
In the bogginess process in lake, have only and consider that simultaneously plant distributes and the alluvial ability, the reflection plant of science is to the contribution rate of bogginess more, so the importance value (W of the top layer of lakes and swamps degree-water body vegetation
Zzh) be:
I, n=1,2 ..., m, wherein 1,2 ..., on behalf of the difference in 1～m kind study area, m build the mass-planting thing.The importance value maximum become this regional advantage marsh plant.
Characteristic of the present invention is: because the top layer-water body in the different careless types lake is built mass-planting by group's difference to some extent, plant is decomposed alluvial speed and exists than big-difference, carry out the reconstruction of vegetation index by coefficient of dissociation after, consider Plant Diversity with plant distribution prerequisite under, determine the vegetation importance value of degree of peat formation, can improve regional susceptibility, obtain being more suitable for the vegetation index that the survey region vegetation is formed and the degree of peat formation of feature is predicted.
Embodiment
Below by example the technology of the present invention is carried out specific description:
(1) determines mainly to build the mass-planting thing in the top layer-water body of survey region by identification on the spot, determine the overall target of plant distribution characteristics.
Study area is the careless type of Haihe basin lake, by investigation, determines that the mass-planting thing of mainly building in this zone is: emergent aquactic plant-reed, cattail; Floatingleaved plant-He; Heavy water is planted-Potamogeton pectinatus L, hornwort.The overall target of each plant distribution characteristics is as shown in the table:
Table 1 is mainly built the overall target of mass-planting thing distribution characteristics
(2) carry out field trial or literature survey, determine mainly to build the residual body coefficient of dissociation of mass-planting thing.
Get decline phase and build the mass-planting thing and simulate on the spot and decompose experiment, draw this lake mainly to build group plant residue coefficient of dissociation as shown in the table:
Table 2 is mainly built the coefficient of dissociation of group plant residue
(3) utilize the residual body coefficient of dissociation of step (2), carry out the factor and rebuild, the importance value and the advantage marsh plant of the degree of peat formation of different plants determined in identification.
Residual body coefficient of dissociation to plant transforms, and draws plant alluvial coefficient A to be:
Table 3 is mainly built the alluvial coefficient of mass-planting thing
According to the principal character index of building the mass-planting thing and the alluvial coefficient of gained, the vegetation importance value of determining this lakes and swamps degree is shown in the following table, and definite reed is the advantage marsh plant on this ground:
The top layer of table 4 lakes and swamps degree-water body vegetation importance value
Claims (4)
1. the top layer of lakes and swamps degree-water body vegetation importance value identification technique, it is characterized in that phytometer being rebuild by the coefficient of dissociation of different plants, and diversity and the distributed intelligence of consideration plant, the importance value of identification and definite vegetation obtains being more suitable for the vegetation index that image study zone vegetation is formed and the degree of peat formation of feature is predicted.According to claims 1 described method, its concrete characterization step is as follows:
(1) by mainly building the mass-planting quilt in the top layer-water body in on-the-spot investigation Research on Identification zone, determines the overall target of plant distribution characteristics.
(2) carry out field trial or literature survey, determine mainly to build the residual body coefficient of dissociation of mass-planting thing.
(3) utilize the residual body coefficient of dissociation of step (2), carry out the factor and rebuild, the importance value and the advantage marsh plant of the degree of peat formation of different plants determined in identification.
2. according to claims 2 described methods, it is characterized in that: the distribution overall target is meant that the investigation index of emergent aquactic plant is height, density, cover degree, frequency and biomass in the step (1); Group's investigation index of floatingleaved plant is density, cover degree, frequency and biomass; The submerged plant investigation index is frequency and biomass, final overall target (P by distribution characteristics
Zzh), i.e. the mean value of the relative value of each investigation index reflection.
3. according to claims 2 described methods, it is characterized in that: the plant residue of getting is the decline phase plant in the step (2).
4. according to claims 2 described methods, it is characterized in that: the unsophisticated logarithmic equation of definite selection of plant coefficient of dissociation in the step (2).
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102511257A (en) * | 2011-11-15 | 2012-06-27 | 北京师范大学 | Regulating and controlling method for bogginess of grass type shallow lake based on synergic decomposing effect of plant residues |
| CN102542259A (en) * | 2011-12-29 | 2012-07-04 | 宁波工程学院 | Identification method for near-shore on-land water body |
-
2010
- 2010-09-06 CN CN2010102730458A patent/CN101968874A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102511257A (en) * | 2011-11-15 | 2012-06-27 | 北京师范大学 | Regulating and controlling method for bogginess of grass type shallow lake based on synergic decomposing effect of plant residues |
| CN102542259A (en) * | 2011-12-29 | 2012-07-04 | 宁波工程学院 | Identification method for near-shore on-land water body |
| CN102542259B (en) * | 2011-12-29 | 2013-08-07 | 宁波工程学院 | Identification method for near-shore on-land water body |
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Open date: 20110209 |