红壤小流域不同土地利用方式下的水土流失特征

运用通用土壤侵蚀方程对皖南红壤地区的荣胜河和兆溪口两个小流域土壤侵蚀量进行估算的结果表明,分布广泛的常绿阔叶林和灌丛以及牧草等植被类型具有较好的土壤保持效果,其中以常绿阔叶林的年均土壤保持量最大,而且其抗土壤侵蚀能力在各种土地利用类型中表现最强;两个小流域水土流失极为严重的区域多位于上游地势较高的中山丘陵区,具有明显的空间分布特征.

The characteristics of soil and water loss of different land utilization models in small watersheds of red soil region

The current land utilization makes against soil and water conservation in red soil region in Southland of Anhui Province. The Universal Soil Loss Equation (USLE) is used to estimate the soil losses in two small watersheds of this region. The results showed that the soil conservation capacities of the mountainous evergreen forest are the largest. There is more obvious spatial distribution rule of water and soil loss in two small watersheds, and almost all the regions where water and soil losses seriously are located in the middle mountains or the hills of relatively high altitude.