长江流域土壤水量平衡与植被旱度研究

以流域为研究单元,采用水量平衡与估算法相结合的参考蒸散修正模型,定量分析了长江流域九个区域的不同水平年的土壤水分动态、植被耗水量、水分亏缺量及植被旱度。结果表明:长江中下游流域植被旱度较大,特别是偏枯年。不同区域四季干旱规律、干旱程度不同,各有特点。长江流域的水量平衡中水分蒸散是主要的输出形式。因蒸散力较大,所以植被旱度较大,植被恢复要充分考虑其水分条件,选择合适条件的物种。

Water Measure Equilibrium in the Valley of Yangtse River and the Dry Degree of Forest

Regarded river valley as unit,the water measure equilibrium of different level year was quantitatively analyzed in nine districts in the valley of Yangtse River with the modified model to test stand evapotranspiration which combined water measure equilibrium method and estimation method together.The results showed that the droughty degree in the valley of Yangtse River was serious,especially in water lacking year.The droughty disciplinarians and degree were different in different districts.In the valley of Yangtse River,water evapotranspiration was the mainly output form in the water equilibrium.Because the evapotranspiration ability was big,so the droughty degree of plant was big.When replantting the plant the water condition could be considered,and suitable species were chosen.