黄土丘陵沟壑区不同土地利用类型土壤抗侵蚀性研究

为了解我国北方农牧交错区不同地表覆盖物对土壤入渗的影响,以宁夏回族自治区盐池县为例,采用样线调查法进行地被状况调查,并在所设样线各样方内对应进行入渗试验.通过对外业数据的处理、分析,对各种地被状况影响入渗的情况进行了探讨.结果表明,植物的生长对水分入渗具有促进作用.植被盖度与入渗深度之间呈指数相关关系,相关系数达0.893.枯落物的覆盖对水分的入渗具有明显的阻碍作用,两者呈对数相关关系,相关系数高达0.921.生物结皮对入渗具有明显的阻碍作用,结皮盖度与人渗深度之间呈线性负相关,相关系数为-0.765,说明结皮的存在使土壤水分呈现浅层化趋势.

Soil Anti2erodibility Under Different Landuse Types in the Loess Hill and Gully Area

This study was conducted to understand the influence of surface coverage on soil infiltration in the farming-grazing transitional zone by taking Yanchi County, Ningxia Hui Automous Region as an example. The sample line method was used for the survey of plant coverage and infiltration measurements were carried out in sample plots. After field data were processed and analyzed, the effects of ground patterns on infiltration were then examined. Results show that plant growth can accelerate infiltration and plant coverage is exponentially related to infiltration depth with a correlation coefficient of 0. 893. The withered materials can significantly prevent water infiltration and the two present a logarithmic relation at a correlation coefficient of 0. 921. Bio-crust clearly impedes water infiltration and bio-crust coverage is negatively correlated to infiltration depth with a correlation coefficient of -0. 765. This implies that bio-crust is mainly responsible for the thinning trend of soil water content.