三峡库区紫色土坡地的耕作利用方式与水土流失初探

THE INFLUENCE OF DIFFERENT CULTIVATION ON SOIL AND WATER LOSSES OF SLOPES LANDS IN THE THREE GORGES RESERVOIR REGION

三峡库区紫色土坡耕地分布广，水土流失严重。对５个小区降雨连续２ａ的观测和泥沙养分分析，证明免耕植橙、石坎梯地、纵横向沟等是保持水土较好的耕作利用方式。在此基础上，增加植被覆盖度、加强夏作的表土保护，能显著地控制紫色土坡耕地的水土流失。

The purple sloping cropland distributes extensively in the TGRR with serious soil losses.Rainfall and the nutrients(O.M, N, P, K) of sediment in this area were measured.The results showed that the losses of soil and nutrient were closely related to the cultivation patterns of sloping land.Planting orange trees on the zero tillage land, building stone wall terraces and digging vertical and horizontal furrows were good land using methods.Furthermore,soil and water losses of purple sloping cropland could be controlled effectively by increasing plant cover rate and protecting top soil.