水土保持学报2001，Vol.15Issue(1)：90-94,5.
大尺度流域不同地貌类型区水土保持减水效益分析
Benefits of Water Reduction by Soil and Water Conservation in Different Physiognomy Type Areas of Big Scale Watershed
摘要
Abstract
Tendency analysis indicate that the yearly r unoff of threetypical basins (Dali river, Hailiutu river and Xiaoli river), whi ch belon g to riverhead gully section, sand and wind section and hill section respectivel y changed consistently in 1970, namely the annual runoff has showed decreasing t endency since 1970. Compared with the runoff in 1959～1969, the average extents o f water reduction in riverhead gully section (Dali river) and hill section (Xi aoli river) are maximal, namely 36.33 % and 36.21 %, respectively, and the one o f water reduction in sand and wind section (Hailiutu river) is the least, namely 20.61 %. The variation of the extents of water reduction is mostly caused by integrated r esults of different underlying surface status, soil and water conservation measu res and controlling degree, rainfall variation in different physiognomy type are as. The monthly water balance model for calculating runoff on loess plateau has been used in analyzing the benefits of water reduction by soil and water conserv ation. The results indicated that the benefits of three typical basins water red uction in 1970s didnt show significant difference, but the benefits of water reduction in 1980s are very significant difference. The benefit of water red uction in hill section (Xiaoli river,24.99 %) is greater than that in sand and w ind section (Hailiutu river, 17.28 %) and in riverhead gully section (Dali river , 13.13%). Results above are the basis of evaluating the effect of eco-envi ronment of the Loess Plateau on the water resources and the evolvement of water environment of Yellow River.关键词
大尺度流域/地貌类型区/水土保持/减水效益分类
农业科技引用本文复制引用
刘贤赵,黄明斌..大尺度流域不同地貌类型区水土保持减水效益分析[J].水土保持学报,2001,15(1):90-94,5.基金项目
国家自然科学基金重大项目 （）
