Analysis of the runoff cost for sediment control by slope soil and water conservation measures
YAN Li, WANG Fei, MU Xin-Min
(1. College of Resources and Environment, Northwest A&F University, 712100,Yangling, Shaanxi; 2. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, 712100,Yangling, Shaanxi; China）
Abstract：Runoff cost for sediment control, shown as ratio of detained runoff and sediment (Rrs) of different soil and water conservation measures is an important integrated indicator to intuitive evaluate the impact of different soil and water conservation measures on runoff and sediment synchronously. Based on the experimental data measured in runoff plots in Xifeng and Tianshui stations for many years, the runoff cost for sediment control under different tillage measures and biological measures were analyzed. The results showed that the Rrs of different tillage and biological measures were greatly impacted by I30 and slope, and the RRS was negatively correlated to the two factors. As to the tillage measures and biological measures, the relationship between Rrs and slope appeared as a exponential function as I30 was more than 0.29mm/min and 0.48mm/min respectively. The orders of runoff cost for sediment control for different tillage measures were: level ditch tillage>shallow plowing>deep plowing, and Rrs of level ditch tillage is higher than that of deep plowing by 33.8%. As to biological measures the orders of runoff cost for sediment control were: intercropping between low-stem and high-stem crops (corn/soybean)>monoculture of low-stem crops (lentils)>rotation between middle-stem crops (winter wheat/buckwheat).
国家自然科学基金“基于相同气候条件的人类活动对河流水沙影响定量评价——以黄土高原延河流域为例”（41171420）；中国科学院重点部署项目“黄土高原及周边沙地近代生态环境的演变与可持性”课题的子课题“黄土高原可持续性评价与适应对策”（KZZDEW040704）；中荷联合主题研究项目“渭河流域水环境问题综合治理对策研究”(中国科学院对外合作重点项目GJHZ1018；Netherlands Organization for Scientific Research OND1339291）
2012, Vol. 10 
