Alpine grassland soil health evaluation method based on physical, biological and chemical composite indicators

Abstract

An alpine grassland soil health evaluation method based on physical, biological and chemical composite indicators evaluates the alpine grassland degeneration degree by aid of a grassland degeneration index on the basis of visualized vegetation indicators. The grassland degeneration index (GDI) is composed of the integer bit and an effective figure at the bit after the decimal point, and the structure is that GDI=(100-C)*28%+(100-P)*39%+(70-E)*26%+(25-H)*7%, wherein C indicates the cover degree, P indicates grass yield proportion, E indicates edible forage grass proportion, and H indicates edible forage grass height. The GDI index can be calculated simply by measuring the cover degree, the biomass, the edible forage grass amount and the edible forage grass height of a plant community in practical application. The alpine grassland degeneration degree is judged according o the DGI index: when the DGI index is smaller than 13.9, the grassland is not degraded; when the DGI index ranges from 13.9 to 33.5, the grassland is slightly degraded; when the DGI index ranges from 33.5 to 52.4, the grassland is moderately degraded; when the DGI index ranges from 52.4 to 68.4, the grassland is seriously degraded; and when the DGI index is larger than 68.4, the grassland is extremely degraded. The alpine grassland soil health evaluation method can completely display the grassland degeneration condition information and can qualitatively and quantitatively evaluate the alpine grassland degeneration degree.

Description

technical field [0001] The invention is a method for evaluating the soil health of the alpine grassland based on comprehensive physical, chemical and biological indicators, and is a new evaluation method for the soil health of the alpine grassland. The invention belongs to the technical field of alpine grassland soil health diagnosis and evaluation, and is an important basic work for the stable development of grassland ecosystems and slowing down grassland degradation. Based on field surveys and laboratory analysis data, a reasonable evaluation of the soil health of the alpine grassland ecosystem can scientifically formulate alpine grassland protection policies and propose scientific restoration strategies to protect the ecological environment of the Qinghai-Tibet Plateau and slow down grassland degradation. It can be said that the scientificity of alpine grassland soil health evaluation will directly affect the rationality of policy formulation, so as to affect the ecological...

AI Technical Summary

Problems solved by technology

In these studies, soil quality evaluation was initially based on single soil physical and chemical properties, however, soil physical and chemical properties as soil quality indicators sometimes cannot evaluate the impact of soil management and land use

Moreover, these indicators cannot fully reflect the degree of soil health, that is, soil health cannot be represented by a single physical and chemical indicator, and soil health evaluation indicators must be composed of complex indicators that can represent soil chemical, biological, and physical properties and processes.

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