晋西北黄土丘陵沟壑区典型流域不同植被土壤蓄水能力研究

在对晋西北黄土丘陵沟壑区川河流域土壤蓄水量进行评价和计算的基础上,分析了流域内不同植被条件下以及不同立地条件下的土壤蓄水能力。结果表明:该流域内林草的土壤蓄水能力最好,农地居中,裸地最差,尤其以阴坡乔木树种的蓄水能力最好;立地条件不同,土壤蓄水能力不同;通过对不同降水年份的流域土壤储水量进行分析,表明丰水年的储水量比平水年增加9.2%,干旱年比平水年减少21.3%,在相同降水年份内治理后的储水量是治理前的1.5倍。

Soil Water Storage Ability in Typical Watershed in Loess Hill Area of Northwestern Shanxi Province

On the basis of evaluation and calculation on soil water storage capacity in the typical watershed of Chuanhe river in the loess hill area of northwestern Shanxi Province,soil water storage ability in different vegetation and site conditions in the watershed was analysed.The result shows that soil water storage ability in the forestland(especially arbor in shady slope) and grassland is the best,the farmland,the middle,and the wasteland,the worst.Soil water storage ability is different with different site conditions.The analyses of the soil water storage capacity in the different typical precipitation year show that the water storage capacity in ample flow year increases by 9.2% in comparison with that of the normal year,and the drought year decreases by 27%.The water storage capacity after management is 1.5 times the water storage capacity before management in same precipitation year.