高寒草甸退化对土壤电导率变化影响的研究

土壤电导率是表征土壤水溶性盐的一个重要指标,可反映土壤盐渍化程度。为了研究高寒草甸退化对土壤电导率的影响,以三江源区未退化高寒草甸和退化高寒草甸为研究对象,系统分析了退化高寒草甸的植被特征和土壤特征与土壤电导率的相互关系。结果表明:高寒草甸退化会对土壤电导率产生显著负影响,且土壤电导率与评价高寒草甸的退化指标植被盖度、地上生物量、土壤有机质、土壤全氮含量表现出一致的变化趋势。因而,认为高寒草甸的退化是会引起土壤电导率的变化,土壤电导率作为土壤盐渍化程度的衡量指标,亦可作为评价草甸退化的客观指标之一。

The influence of alpine meadow degradation on soil conductivity change

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 meadows 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 meadows 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.