森林枯枝落叶层涵养水源保持水土的作用评价

Evaluation on Role of Forest Litter to Water Source Conservation  and Soil and Water Conservation

在综合分析森林枯枝落叶层各水文生态功能和蓄水减沙效益的基础上，首次提出了在森林垂直结构的３个层次中，枯枝落叶层是实现森林涵养水源、保持水土的主要作用层。它所涵蓄的降水达到了农地径流量的６２．９％，它具有的保持土壤的能力，足以使坡面森林采伐后不会出现新的水土流失。因此，保护好这一死地被物层是山区营林工作的重要任务。

Based on the comprehensive analysis on the hydroecological functions of forest litter and its benefits to water storage and sediment reduction,the litter as a main working layer among the three layers of forest vertical structure conserving soil and water source is put forward firstly.According to the determination,the conserved rainfall by the litter reaches to 62.9% of the runoff in farmland,and its capacity to conserve soil is enough to control soil and water loss after forest has been cut in the slope land.So litter is an important layer of forest management in mountain region.