青藏高原高寒草原与草甸土壤可蚀性的关键因子

[目的]探讨青藏高原高寒草原与草甸土壤可蚀性特征差异,为高寒草原草甸土壤可蚀性研究提供重要参考.[方法]选取18个变化因子作为草原与草甸土壤可蚀性评价的影响因子,运用主成分分析、逐步回归分析以及通径分析法,确定高寒草原与草甸土壤可蚀性的主要影响因素,筛选青藏高原高寒草原与草甸土壤可蚀性的关键因子.[结果]高寒草原土壤可...

Key Factors of Soil Erodibility for Alpine Grassland and Meadow in Qinghai-Tibet Plateau

[Objective] The differences in soil erodibility between alpine grassland and alpine meadow in the Qinghai-Tibet Plateau were determined, in order to provide important reference for soil erodibility in alpine grassland. [Methods] 18 change factors were selected as potential influencing factors of soil erodibility for grassland and meadow. Principal component analysis, stepwise regression analysis, and path analysis were used to determine the main influencing factors of soil erodibility in order to select the key factors. [Results] The soil erodibility of alpine grassland was mainly affected by soil particle size and aggregate characteristics. Soil erodibility of alpine meadow was mainly affected by particle size and pore distribution, organic matter, aggregate characteristics, and permeability. The key factors of soil erodibility in alpine grassland were as follows: silt, mean weight diameter (MWD), aggregate size > 2 mm processing damage rate (PAD_>2), and aggregate size > 0.25 mm processing damage rate (PAD_>0.25). The key factors of soil erodibility in alpine meadow were as follows: silt, clay, aggregates size > 1 mm processing damage rate (PAD_>1), and soil saturated hydraulic conductivity. [Conclusion] Grassland and meadow soil showed great differences in particle mechanical composition, organic matter content, water content, and so on. The state of meadow soil was more suitable for vegetation development.