森林植被对防治洪水灾害的作用分析

Relationship between flood and forest vegetation in Zhejiang Province in 1994:

１９９４年的水灾，给浙江省造成直接经济损失３９．９亿元，调查研究结果表明。森林对防治灾减灾作用非常明显，它主要是通过树冠截留、减少地表径流和提高土壤蓄水性能来实现防灾抗灾作用的。在森林覆盖率和森林蓄积量这两个因子中，后者与灾情关系更为密切，当森林蓄积量每亩平均在３．５ｍ３左右的地区就没有灾情发生，蓄积量在２．０ｍ３左右的地区灾情不明显，蓄积量在１．０ｍ３左右的地区灾情严重。

The economic loss made by floods in Zhejiang Province in 1994 reached 3 99 billion yuan RMB. It was shown that forest decreased soil runoff loss and improved soil water-conserving capacity from our investigation. The forest store is more relative to flood than the forest cover rate. When the forest store was more than 3 5m 3 per 667 m 2, the flood didn't happen. But the flood took place when the forest store was less than 1 0m 3 per 667 m 2.