密云水库北京集水区典型植被土壤入渗特征研究

通过对密云水库北京集水区5种典型植被类型入渗特征的研究表明,密云水库水源涵养林林地土壤的初渗速率在13~20mm/min之间,改变微地形后,土壤的渗透性能得到明显改善.密云水库北京集水区土壤渗透性和持水功能最好的是侧柏林,最差为荒草坡和农田.对3种渗透模型拟合结果表明,考斯加柯夫公式和菲利普公式对该地区土壤入渗前期拟合较好,而随着时间推移,霍顿公式的拟合结果更接近于实测值.

Soil Infiltration Characteristics of Typical Vegetation in the Catchment of Miyun Reservoir

The infiltration characteristics of the five typical vegetations growing in the catchment of Miyun reservoir are studied.The results indicate that the beginning infiltration speed of forestry soil is between 13 mm/min and 20mm/min,and soil permeability improves noticeably with the changes of micro-topography.Among the plants growing in the catchment of Miyun reservoir,Biota orientalis forest has the best soil infiltration quality and moisture-holding capability,barren land and farm land have the worse ones.According to the fitted results of three infiltration equations,the fitted results of Kostiakov formula and Philip formula are near to the actual soil infiltration situation at the beginning,however,Horton formula is the best throughout the whole soil infiltration process.