Method for evaluating degradation degree of alpine grassland based on visual vegetation indexes

Abstract

The invention discloses a method for evaluating degradation degree of alpine grassland based on visual vegetation indexes by using a grassland degradation index. The grassland degradation index (GDI) comprises an integer bit and a significant figure behind the decimal point and has a structure that GDI=(100-C)*28 percent+(100-P)*39 percent+(70-E)*26 percent+(25-H)*7 percent, wherein C is a cover degree, P is a grass yield, E is an edible grass proportion, and H is an edible grass height. During actual application, the cover degree, the biomass liveweight, the edible grass quantity and the edible grass height of a plant community are only determined, so that the GDI can be calculated. The degradation degree of the alpine grassland is judged according to the GDI, when the GDI is less than 13.9, the grassland is non-degraded grassland; when the GDI is 13.9-33.5, the grassland is lightly-degraded grassland; when the GDI is 33.5-52.4, the grassland is medium-degraded grassland; when the GDI is 52.4-68.4, the grassland is seriously-degraded grassland; and when the GDI is more than 68.4, the grassland is extremely-degraded grassland. According to the invention, the degradation condition information of the grassland can be completely expressed, and the degradation degree of the alpine grassland is quantitatively and qualitatively evaluated.

Description

technical field [0001] The invention is a method for evaluating the degradation degree of alpine grassland based on visual vegetation indexes, which is a new evaluation method for the degradation degree of alpine grassland. The invention belongs to the technical field of diagnosis and evaluation of alpine grassland degradation degree, and is an important basic work in grassland conservation and degraded grassland management. Only by making a reasonable evaluation of the degradation status of alpine grassland based on field survey data can scientific conservation and restoration plans be formulated and effective measures taken. It can be said that the rationality of the diagnosis of alpine grassland degradation will directly affect the decision-making, so as to affect the economic development of animal husbandry in the alpine area and the ecological security of the local and surrounding areas. Background technique [0002] The Qinghai-Tibet Plateau is the "third pole" of the...

AI Technical Summary

Problems solved by technology

In the original evaluation system, the degree of degradation is diagnosed based on individual indicators, and the evaluation results are different.

Moreover, the original evaluation system did not specify the weight of each index in the system, which led to uncertainty in the evaluation of the degree of grassland degradation

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