祁连山林草复合流域土壤水文效应

通过测定国家重点野外科学观测试验站———祁连山森林生态站排露沟流域土壤水分物理性质,研究其水文效应表明:(1)亚高山灌丛草甸土持水能力最强、通气状况良好,山地森林灰褐土持水能力次之、通气状况最好,山地栗钙土持水能力较差、通气不良;(2)土壤水文效应随深度而变化,变化幅度亚高山灌丛草甸土>山地森林灰褐土>山地栗钙土;(3)单位土壤水文效应亚高山灌丛草甸土>山地森林灰褐土>山地栗钙土;(4)土壤水文效应大小除受本身的性质决定外,还受其厚度影响,亚高山灌丛草甸土各项指标均高于其它土壤类型,由于其处于较高海拔土层薄,总的水文效应指标除自然贮水量外反而比山地森林灰褐土和山地栗钙土低。

Soil Hydrological Effect of Forest and Grass Complex Watershed in Qilian Mountains

The paper researched the soil water effect across measuring the physical characters of soil water in Pailugou watershed in Qilian Mountains forest ecology monitoring station belonging to the state key field scientific experimental station. The result shows:(1)The water holding capacity of sub-alpine shrub meadow soil is best and aerate well and then forest gray-brown soil with best aeration, chestnut soil has little water holding capacity and bad aeration;(2)The index of soil hydrology effect changes with soil depth, the change extent was sub-alpine shrub meadow soil > forest gray-brown soil > chestnut soil;(3)Hydrology effect of soil unit depth was sub-alpine shrub meadow soil > forest gray-brown soil>chestnut soil;(4)Soil hydrology effect is affected by soil depth besides its characters, the indexes of unit depth of sub-alpine shrub meadow soil were better than the other soil types, but the total hydrology effect index was lower except of natural storing water amount since the little soil layer in the high altitude.