大兴安岭黑土区森林对径流的影响

Runoff influence by forest in black soil region of Daxing’anling area

根据对大兴安岭东南麓黑土区分析,结果表明,对于一次孤立的洪水,森林有明显的降低洪峰、减少洪水流量、延缓洪水过程的作用。在一般情况下,流域内森林覆盖率较高地区枯季径流量比森林覆盖率相对较低地区大,年内分配也较均匀。森林砍伐后会使年径流量明显减少,年径流量随森林覆盖率的增大而增加。

Based on analysis at black soil region in southeast side of Daxing’anling area,the results show that forest has the effects of decreasing flood peak,reducing flood discharge and delaying the flood process to an isolated flood.In general,the runoff of dry season is larger in high forest coverage area than in the low area,and the annual distribution is more uniform in high forest coverage area.The annual runoff will reduce after deforestation,and it increases with the more forest coverage.