干旱区研究

Arid Zone Research >

2021 , Vol. 38 >Issue 1: 104 - 113

DOI: https://doi.org/10.13866/j.azr.2021.01.12

Soil Resources

The influence of alpine meadow degradation on soil conductivity change

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  • 1. Qinghai University, Xining 810016, Qinghai, China
    2. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
    3. National Ecosystem Science Data Center, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China

Received date: 2020-08-03

  Revised date: 2020-09-24

  Online published: 2021-03-05

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Abstract

Grassland degradation is a complex and long-term process, and the most apparent sign of its occurrence is vegetation degradation (e.g., vegetation community composition, productivity, and spatial structure). During this process, soil physical-chemical properties change, impoverishing the soil and making it arider. Soil electric conductivity is an index for measuring the water-soluble salinity, reflecting soil salinization. To explore how the soil conductivity changes during the degradation of alpine meadow, whether the soil conductivity presents a regular change with the degradation of alpine meadow, just like the physical-chemical characteristics of vegetation and soil. Therefore, to analyze the influence of alpine meadow degradation on soil conductivity, we studied the undergraded and degraded alpine meadows in the Three River Source Region. We adopted a statistical test method to systematically analyze the relationship between vegetation and soil characteristics and the degraded alpine meadow’s soil conductivity. The degradation of alpine meadow significantly affected the vegetation coverage and biomass, causing the reduction of total soil nitrogen, organic matter, and moisture, turning it more infertile. We found that alpine meadow’s degradation negatively impacted soil conductivity. The soil conductivity showed a consistent trend with alpine meadow’s degradation indexes, including vegetation coverage, aboveground biomass, soil organic matter, and total nitrogen content. Therefore, we believe that alpine meadow’s degradation will change soil conductivity, and that these parameters can be used as an index of the degree of soil salinization and meadow degradation. Our study aims to reveal the characteristics of vegetation-soil conductivity during the alpine meadow’s degradation process, enrich the evaluation indexes of degraded alpine meadow, and provide a scientific basis for the early warning and restoration management of degraded alpine meadow.

Key words： alpine degraded meadow; soil electrical conductivity; vegetation characters; soil characters

Cite this article

WANG Yingcheng,LU Guangxin,ZHAO Lirong,DENG Ye,WANG Junbang . The influence of alpine meadow degradation on soil conductivity change[J]. Arid Zone Research, 2021 , 38(1) : 104 -113 . DOI: 10.13866/j.azr.2021.01.12

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