黄土区大面积、高强度的植被营造工程和各项水利工程虽充分利用了有限的水资源 ,减少了入黄泥沙 ,但同时也人为的切断或改变了水分循环的途径 ,对水环境产生不同方向和程度的影响。尽管国内外学者对水土保持的水环境效应已进行了不少研究 ,但仍存在一些问题 ,主要表现在单项措施 ,特别是林草措施下的水环境效应研究比较深入 ;在水环境研究内容上 ,多注重对地表径流减水减沙的分析 ,而对水量平衡、水文情势等研究较少 ;在研究尺度上 ,多集中于对径流小区的分析 ,单点研究深入而面研究不够 Although large-scale and high-intensity vegetation construction projects and various water conservancy projects in the loess area make full use of limited water resources and reduce sediment into the Yellow River, they also artificially cut off or changed the water cycle and produced water environment Different directions and degree of impact. Although domestic and foreign scholars have done a lot of researches on water environment effect of soil and water conservation, there are still some problems, which are mainly manifested in that individual measures, especially water environment effects under grass and grass measures, are studied in depth. , Pay more attention to the analysis of surface runoff water and sediment reduction, while less research on water balance and hydrology; on the research scale, more focus on the analysis of runoff plot, single point of research and in-depth study is not enough