黄土高原林区植被变化对水沙演变的影响OA北大核心CSTPCD

[Objective]The aims of this study are to examine the influence of forest vegetation changes on water-sediment dynamics,and to provide a scientific basis for formulating and adjusting ecological environment development policies in the Yellow River Basin.[Methods]Based on the runoff and sediment discharge data from the Dacun hydrological station in the Shiwangchuan River Basin from 1959 to 2018,as well as precipitation data within the basin,the hydrological changes over a span of 60 years were analyzed.By combining NDVI data from 1985 to 2018 and land use data from five periods,the vegetation underlying surface driving effects on water-sediment changes in the watershed were analyzed and discussed.[Results]The runoff and sediment discharge in the Shiwangchuan River Basin had shown a significant decreasing trend over the past 60 years(p＜0.01),with abrupt changes occurring in 1988 and 1983,respectively.However,there had been no significant trends in land use and precipitation within the watershed during this period.The NDVI during the growing season showed little variation before 2000 but exhibited a significant increasing trend after 2000.[Conclusion]Before 2000,the implementation of various soil and water conservation measures was the main reason for the decrease of runoff and sediment transport in the basin;After entering the 21st century,the improvement of vegetation quality in the basin has further reduced runoff and sediment transport.