妫水河流域水源涵养林时空动态格局研究

 分析官厅水库上游妫水河流域20多年水源涵养林分布格局的动态变化。结果表明:妫水河流域的森林覆盖率一直呈上升状态,从1975年的10.96%,已上升到46.61%;经济林面积增长迅速,每年约增长150hm2;树种组成正在向多样性转化,从1975年以4个主要树种为主,到1995年已形成8个树种的格局。因此认为妫水河流域水源涵养林总体状况正在好转,但还存在经济林面积增加过快,可能引起环境污染和森林植被类型结构不合理等问题。

Dynamic pattern of water conservation forest on space-time in Guishui river basin

Dynamic variation of distribution pattern of water conservation forest in the last 20 years in Guishui river basin of upper reaches of Guan Ting was reservoir analyzed. The results showed that the forest cover rate increase straightly from 10.96% in 1975 to 46.61% in 2000. The area of cash forest increases rapidly about 150 hm^2 each year. The main tree species composition is becoming variety from 4 in 1975 to 8 in 2000. So it is considered that the situation of water conservation forest in Guishui river basin is better and better, but also there are many problems, such as too many cash forest causing environment pollution and irrational distribution of forest vegetation in the watershed and so on.