Landscape-scale plant diversity evaluation method with time-space consistency

Abstract

The invention discloses a landscape-scale plant diversity evaluation method with time-space consistency. The method comprises the following steps: S1, interpreting a medium-high resolution remote sensing image based on a random forest method, and obtaining a typical plant community spatial distribution diagram of a research area; s2, performing drainage basin analysis based on a digital elevation model (DEM) of the research area, and dividing the research area into a plurality of water collection areas or small drainage basins; s3, improving a plant diversity evaluation index of a sample point scale, replacing species counting with a species distribution area, and constructing a landscape-scale plant diversity evaluation index Di (x, y) with time-space consistency; and S4, calculating the landscape-scale plant diversity index of each small watershed of the research area, evaluating the overall plant diversity of the research area by using the landscape-scale plant diversity index, and analyzing the spatial-temporal change of the overall plant diversity. The method is suitable for plant diversity evaluation of regional scale long-time sequences, the operation method is simple and convenient, and popularization and application are facilitated.

Description

technical field [0001] The invention relates to the technical field of biodiversity evaluation, in particular to a landscape-scale plant diversity evaluation method with temporal and spatial consistency. Background technique [0002] The plant diversity in the ecosystem is the main component of its biodiversity, because vegetation not only plays an important role in the ecosystem as the main supplier of material energy, but also constitutes the main habitat of mammals, birds and other life forms, Therefore, changes in its attributes mean changes in the habitats of other organisms. Maintaining regional plant diversity is the key to maintaining ecosystem biodiversity, and scientific assessment of its plant diversity is also the key to revealing the overall level of regional biodiversity. [0003] The traditional plant diversity assessment is mostly based on the vegetation survey data of sample points. Due to the limitation of the number and distribution of sampling points, it ...

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Problems solved by technology

[0003] The traditional plant diversity assessment is mostly based on the vegetation survey data of sample points. Due to the limitation of the number and distribution of sampling points, it is often difficult to expand the evaluation results from local to global scales, and it is also difficult to make horizontal and vertical comparisons. Assessment of the impact of climate change and human activities on ecosystem services

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