等高垄作垄沟的水土流失特点研究

Erosion Characters of Ridge and Ditch Under Contour Tillage

研究了紫色土地区等高垄作法耕作中垄和沟的侵蚀特点，结果表明：等高垄作法在无覆盖时（包括植被），相对于平板耕作法有保水作用，而无防蚀效果；侵蚀主要发生于垄上，以流失土壤物理性粘粒为主，而平板地流失土粒无选择性，结构系数明显相对减小，导致了土壤性能恶化。

The erosive characteristics of ridge and ditch under countour tillage are studied in purple soil. The results show that, comparing with conventional tillage(CK), the runoff of contour tillage (CT) is diminished, but the sediment is not. When there are not any cover (including vegetable cover) on soil, the sediment of CT is mainly physical clay coming from its ridge, but that of CK is similar to the particle distribution of its source soil and its coefficient of soil structure is decreased significantly. It suggests that cover on ridge of CT will play an important role in controlling erosion, and CK will led to soil degradation notably.