【摘要】 借助大量观测资料分析研究了不同森林类型、不同土地利用状况以及不同尺度下 ,森林对非点源污染的调控能力较强 ,坡面森林可使固体污染物减少 60 %以上 ,林地的营养元素损失减少 30～ 50 %。对于不同尺度下的流域 ,森林覆盖率高的流域水质参数指标大多低于森林覆盖率低的流域 ,尤其是 NH+ 4 ,从坡面小流域到大流域急剧下降。被采伐过的流域的水温上升 0 .2～ 0 .4℃ ,N损失量从 4kg/hm2· a上升到 1 42 kg/hm2· a。更多还原

【Abstract】 The control capacity of forest ecological system for non point pollution under different forest styles, land use and different scales were analysed. It shows that forest ecological system has stronger capacity for non point pollution control. Hill side forest can reduce solid pollutants at least 60%, and decrease the loss of nutrient elements up to 30%～50%. The parameters of water quality under higher forest coverage ratio are much lower than that under lower forest coverage ratio. The water temperature in cutting watershed will increase at 0.2℃～0.4℃. The loss of N from 4kg/hm 2·a will be up to 142kg/hm 2·a.更多还原