【摘要】 本研究旨在研究雅江中游河谷土壤抗蚀性的空间差异性。以雅江中游河谷地带典型样地0～20 cm土壤为研究对象,采用ANOVA显著性分析和主成分分析方法,对雅江中上游河谷地带土壤的机械组成、有机质含量、团聚体含量以及土壤容重进行研究。结果表明:土壤有机质含量、团聚体含量状况是评价雅江中上游流域土壤抗蚀性强弱的最佳指标;不同河谷地区的土壤抗蚀性强弱差异显著;有机质与水稳性指数和水稳性团聚体均呈不显著正相关关系(P>0.05),与容重和结构破坏率均呈不显著负相关(P>0.05),而容重与结构破坏率呈显著正相关(P<0.05)。植被覆盖度、人为干扰因素是导致土壤抗蚀性空间差异的重要原因,因此可以采取措施增加地被物覆盖度、减少人为破坏,增强土壤的抗蚀性,改善雅江中游流域的水土流失现状。更多还原

【Abstract】 The purpose of this study was to research the spatial difference of soil antierodibility in the valley of Yarlung Zangbo River. In this paper,the 0～20cm soil in the typical plot of the middle reaches of the Yajiang River was used as the research object.The ANOVA significance analysis and principal component analysis method were used to analyze the mechanical composition, organic matter content,aggregate content and soil bulk density. The results showed that soil organic matter content and aggregate content were the best indicators for evaluating the soil antierodibility, and there were significant differences in soil antierodibility in different valley areas.The antierodibility of different soils was:YD-3>YD-1>YD-4>YD-2.There was no significant positive correlation between organic matter,water stability index and water-stable aggregates(P >0.05), and there was no significant negative correlation with bulk density and structural failure rate(P>0.05), but bulk density was significantly positively correlated with structural failure rate(P<0.05). In conclusion, vegetation coverage and human disturbance are important reasons for the spatial difference of soil erosion resistance.Therefore,corresponding measures should be taken to increase the coverage of ground cover and reduce man-made destruction to enhance soil corrosion resistance and improve current status of soil erosion in the middle and upper reaches of the basin of Yarlung Zangbo River.更多还原