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Reductions in non-point source pollution through different management practices for an agricultural watershed in the Three Gorges Reservoir Area

查看全文 作　　者：Yaowu [1,2]Tian;Zhilin [2]Huang;Wenfa [2]Xiao 高影响力作者 机构地区：[1]School of Life Science, Sun Yat-sen University, Guangzhou 510275, China.;[2]Key Laboratory of Forest Ecology and Environment, State Forest-ry Administration China, Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 10091, China高影响力机构 出　　处：《Journal of Environmental Sciences》索引2010年第22卷第2期,共8页高影响力期刊 基　　金：supported by the 11th-Five Year Scientific Support Program of China (No.2006BAD03A13,2006BAD03A07) 摘　　要：Non-point source water pollution generated by agricultural production is considered a major environmental issue in the Three Gorges Reservoir Area(TGRA) of China.The Annualised Agricultural Non-Point Source Pollution(AnnAGNPS) model was selected to assess the impact of the application of various management treats,including seven crops,five fertilizer levels and three-group management practice scenarios,on water quality from Heigou River Watershed in TGRA.The scenario subsets include conservation tillage practice(CTP),conservation reserve program(CRP) and conversion of cropland into forestland program(CCFP).Results indicated that tea can not be replaced by other crops because comparatively tea resulted in a higher sediment yield.CTP with no-tillage was more effective to reduce sediment yield,but could increased nutrient loss.CRP reduced sediment yield significantly,but slightly benefited on nutrient loss.CCFP reduced not only sediment yield but also the nutrient loss significantly.The conversion of cropland with a slope greater than 10 ° into forestland was found to be the best scenario as the sediment yield export is less than 5 tons/ha and nutrient loss is within the permissible limit. 关 键 词：农业非点源污染 三峡库区 小流域 管理 ANNAGNPS 自然资源保护区 养分流失 保护性耕作
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