Study On Hydrological Function Of Forest And Vegetation In The Pailugou Catchment, Qilian Mountains

Forest ecosystems in the geosphere- biosphere occupies an important place in the biogeochemical cycle, are important material base of human survival and development. Based on Qilian shanxi water forest dew ditch valley as the research base, using positioning observation method, in watershed scale, comprehensive analysis and comparison of the water conservation capacity of forest vegetation, conclude that ecological and hydrological functions and features of various vegetation types to provide the feasibility of the Qilian mountain forest ecosystem protection and management of the necessary theoretical reference. Through the Qilian mountain dew ditch forest vegetation hydrological function research, the results show that:(1) the Qilian mountain forest precipitation with altitude gradient rises, decrease from east to west, uneven distribution of precipitation and years.(2) the snow is Qilian mountain forest area and a unique "solid reservoir", slope and vegetation types, etc. are the important factors influencing the row of small snow distribution.(3) through the intercept, canopy on distribution of precipitation for the first time, because of the tree species, forest type, rainfall intensity and rainfall form and the duration of the different entrapment quantity difference is very big.(4) for water allocation is to hold to regulate the precipitation, litter volume, type, composition, decomposition and its effect on the size of the condition, the moisture content of litter and intercept, both with the seasons change.(5) function is closely related to the size of forest soil types and soil, runoff formation process often through precipitation infiltration, storage, transformation and adjust the precipitation formation.(6) Qilian mountain forest vegetation, the four main forest vegetation type water supply situation is: Qinghai spruce forest woodland is best, followed by Qilian round Berlin, shrubbery, the worst is the animal husbandry slope grassland;(7) has its particularity of permafrost on runoff formation has certain regulation, as the change of seasons climate, seasonal frozen earth changes.