Effects of landuse change on surface runoff and sediment yield at different watershed scales on the Loess Plateau

作     者：ZHANG Xiaoming1, CAO Wenhong2, GUO Qingchao3, and WU Sihong41 Assoc. Prof. Dr., China Institute of Water Resources and Hydropower Research, Beijing 100048, China, 2,3 Prof. Dr., China Institute of Water Resources and Hydropower Research, Beijing 100048, China, 4 Dr., Department of Land and Water Resources Engineering, Royal Institute of Technology, Stockholm, SE-100 44, Sweden 

作者机构：Assoc. Prof. Dr. China Institute of Water Resources and Hydropower Research Beijing 100048 China Prof. Dr. China Institute of Water Resources and Hydropower Research Beijing 100048 China Dr. Department of Land and Water Resources Engineering Royal Institute of Technology Stockholm SE-100 44 Sweden 

出 版 物：《International Journal of Sediment Research》 (国际泥沙研究(英文版))

年 卷 期：2010年第25卷第3期

页      面：283-293页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0903[农学-农业资源与环境] 0816[工学-测绘科学与技术] 

基　　金：supported financially by the National Natural Science Foundation of China (Hydrological Simulation and Regulation of Watersheds, No.50721006) the National Basic Research Program of China (No.2007CB 07205) the National Key Research Program in the “Eleventh Five-Year Plan” (No. 2006BAD09B02) 

主　　题：Soil erosion Land use change Scale effect Surface runoff and sediment yield Watershed Loess Plateau 

摘      要：Erosion and sediment yield from large and small watersheds exhibit different laws. Variations in surface runoff and sediment yield because of landuse change in four watersheds of different scales from 1 km2 to 73 km2 were analyzed. Due to reforestation and farmland terracing, surface runoff and sediment yield reduced by 20-100% and 10-100% respectively. Reductions in surface runoff were differed significantly under different precipitation regimes. For the large watershed (73 km2) landuse change had similar effects on surface runoff regardless of changing of precipitation. For the small watershed (1 km2) landuse change had fewer effects on surface runoff under high precipitation. The relative changes of sediment yield in the four watersheds under reforestation and farmland terracing decreased as precipitation increased from 350 mm to 650 mm, then increased as precipitation increased from 650 mm to 870 mm. Where initial forest coverage rate was below 45%, sediment yield decreased dramatically as forest coverage rate increased. Watershed management with aiming at reducing both surface runoff and sediment yield should be conducted both on sloping surfaces and in channels in large watersheds.