The Construction Of Mountain Hydrological Model Of Qinghai Spruce(Picea Crassifolia) Forest In Qilian Mountains

Qilian Mountains is an important water source in the Hexi Corridor, Qinghai spruce forest is an important water conservation forest in Qilian Mountains area, the maximum hydrological effect of forest can play a better service in the lower reaches of the economy and production. In order to understand the relationship between vegetation in the Qilian mountain area and forest, this paper on the basis of Australia’s hydrological model Brook90 on the basis of the experimental area add moss layer and permafrost layer two modules, by 2012 the hydrological data of model parameters was set up, then test the application of 2011 data:soil freezing depth of simulated values and measured values of the Nash coefficient was 0.867, summer melt depth and the measured value of the Nash coefficient was 0.791, the model mainly by soil water content test, mean absolute error in the range of 15% conforms to the requirements of the above 0.7.Application of 2011 meteorological driving data are substituted into the new model. In total precipitation for 496mm. In interception amount for 91mm, annual evapotranspiration 253mm, annual surface runoff 89mm and annual surface into the infiltration capacity for 203 mm, in line with the conditions of water balance were obtained. The daily data and monthly data and Brook90 computing hydrological parameters of runoff, evapotranspiration, soil water content is carried out. (1) a new model of computing results with Brook90 in 7 and September rainfall simulation results can be used to simulate the surface runoff, vegetation interception and transpiration, soil water flow and other key hydrological processes(2) the error of soil moisture content calculated by Brook90 in Jan-April is great, and the new model can be effectively corrected after the new model has been added.(3) adding new models at the beginning of the moss layer during the growing season will most of the precipitation interception. In the middle of the growing season, due to the abundant precipitation on the sample surface water resources supply, so the moss layer interception not obvious for the influence of hydrological processes, also moss layer to water tends to be stable, but soil moisture stress still limit the supply of forest.The model simulates the effects of different cutting intensity on the hydrological process in watershed and global warming, changes of upstream water resource allocation caused by the temperature gradient.