色季拉山垂直气候带土壤可蚀性研究

Soil Erodibility of Typical Climate Types in Shergyla Mountain

为揭示藏东南典型气候带土壤可蚀性强弱及K值分布特征,以色季拉山垂直气候带土壤为研究对象,采用EPIC模型对该区域土壤可蚀性进行分析。结果表明:研究区土壤有机碳含量随海拔上升气候变化表现为,先增加后减小,再增加后又减小的变化规律;通过EPIC计算发现土壤可蚀性K值主要分布在0. 322 9～0. 345 2,属高可蚀性;不同气候类型土壤可蚀性大小顺序依次为:山地温带-亚高山寒温带气候过渡带>亚高山寒温带>山地温带>高山寒温带>亚高山寒温带-高山寒温带气候过渡带。土壤可蚀性K值与土壤大于0. 25 mm水稳性团聚体含量、大于0. 25 mm水稳性团聚体含量、平均质量直径、水稳性指数、粉粒含量均呈显著正相关(P <0. 05),与海拔、砂粒含量呈显著负相关(P <0. 05),但与土壤有机碳含量相关性不显著。

In order to reveal the characteristics of soil erodibility and distribution of K value in the typical climatic zone in Southeast Tibet,this paper took the soil in the vertical climatic belt of Shergyla Mountain as the research object,and EPIC model was used to analyze it.The results show that soil organic carbon content in the research region increases with the increase of the climatic change in the sea area,and then decreases again.The K value of soil erodibility is mainly distributed between 0.322 9 and 0.345 2,it belongs to highly erodible.The soil erodibility in different climatic types is in the following order:Mountainous temperate zone and sub-alpine cold temperate zone climate intermediate belt>Sub-alpine cold temperate zone>Mountainous temperate zone>Alpine frigid zone>Sub-alpine cold temperate zone and Alpine frigid zone climate intermediate belt.The soil erodibility K value is significantly positively correlated with soil water stability aggregate content greater than 0.25 mm,water stability aggregate content greater than 0.25 mm,average mass diameter,water stability index,and powder content.There was a significant negative correlation with altitude and sand content,but the correlation with soil organic carbon was not significant.