论文部分内容阅读
森林与水之间的关系是当今林学和生态学领域研究的核心问题。岷江上游森林在水土保持和调节流域水量平衡等方面具有重要的生态功能,但20世纪以来森林被大量砍伐,生态功能遭到破坏,水沙条件发生改变。以岷江上游紫坪铺控制站长系列水文资料对岷江上游水文特征变化进行分析,并结合森林破坏对森林水文效应进行探讨。其结果表明,由于岷江上游森林破坏,使流域的蒸腾量减小,年径流量增大,枯枝落叶层减少,枯水期径流量减小,河流含沙量增大,洪峰流量减弱,大洪水发生的机率显著下降。
The relationship between forests and water is at the heart of today’s research in the field of forestry and ecology. Forests in the upper reaches of the Minjiang River have important ecological functions in water and soil conservation and regulation of water balance in the basin. However, since the 20th century, forests have been largely deforested, ecological functions have been destroyed, and water and sediment conditions have changed. Based on the series of hydrological data of Zipingpu Control Station in the upper reaches of Minjiang River, hydrological characteristics of the upper reaches of Minjiang River are analyzed, and the hydrological effects of forests are discussed in combination with forest damage. The results show that due to the destruction of forests in the upper reaches of the Minjiang River, the transpiration of the watershed is reduced, the annual runoff is increased, the litter layer is reduced, the runoff in dry season is decreased, the sediment concentration in rivers is increased, the flood peak discharge is reduced, The probability of significant decline.