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《Journal of Glaciology and Geocryology》 2005-05
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Hydrological Adjusting Functions of Different Landscape Patterns in Typical Catchments in Qilian Mountains

YANG Guo-jing,\ DING Yong-jian,\ XIAO Du-ning(Laboratory of Watershed Hydrology and Ecology,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China)  
The relationship between forest and water budgets of mountain catchments is the subject either in ecology or hydrology.The eco-hydrological effects of the forest landscape pattern in the Qilian Mountains of the northwest China are evaluated with the cases of the Dayekou River catchment(DYK) and Haichaoba River catchment(HCB) in this paper.Forest map(1∶50 000) of 2001 and topographic maps(1∶50 000) are used as inputs to produce the landscape maps.Using ArcGIS,the landscape pattern and eco-hydrological effects of the two catchments are analyzed.The results show that the forest of Picea crassifolia growing on the lower land in DYK are the main landscape elements,doing more important work in the eco-hydrologic system,and the shrubs distributed on the higher land in HCB are the main landscape elements and of importance in eco-hydrological process.Taking the total of water intercepted by crown canopy,holding water capacity by shatter and soil as indexes to determine the integrate hydrology adjusting function,based on the observations and the mean annual rainfall records,using ArcGIS,the integrate hydrology adjusting function of the two catchments is calculated.DYK can regulate 36% of the annual rainfall,and HCB can regulate 24% of the annual rainfall.The integrate hydrology adjusting function of DYK is more strong than that of HCB.When the forest coverage rises from 38% to 51% in DYK,the integrate hydrology adjusting function will rise from 36% to 44%.This study shows that the large area of forest can raise the hydrological effect,and different forest landscape pattern will bring on different eco-hydrological effect.
【Fund】: 国家自然科学基金项目(40371026);; 中国科学院“西部之光”人才培养计划项目资助
【CateGory Index】: P344
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