土壤有机质与水土流失的关系定量研究

土壤中有机质含量的多少是衡量土壤肥力高低的主要指标。水土流失对土地生产力的破坏，实质在于土壤肥力的下降或损失。为了探讨土壤有机质与水土流失的定量关系，在王家沟流域10～12°坡耕地上进行了4 a的定位试验。结果表明，每年1 hm²施入有机肥料30 000～75 000 kg，可以减少径流量4.8～12.4个百分点，减少土壤侵蚀量31.5%～35.4%。

Quantitative Study on the Relation of Soil Organic Content and Soil and Water Losses

The soil organic content is the main index of measuring soil fertility. The essence of soil and water losses to land productivity’s damage is the loss or decline in soil fertility. In order to study the quantitative relation of soil organic content and soil and water losses, we had done a four year expriment on the sloping land of 10～12° in wangjiagou watershed. The result show that it can ruduce runoff 4.8～12.4 percent and amount of soil erosion 31.5%～35.4% if executing into the organic fertilizer 30 000～75 000 kg/(hm²·a).