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| Potential of mitigating nonpoint source pollution from farmlands around Zhushan bay in Tai Lake watershed |
| Received:December 30, 2015 |
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| KeyWord:nutrient input;environmental-friendly farming technology;farmland nonpoint source pollution;mitigation potential;Zhushan bay in Tai Lake watershed |
| Author Name | Affiliation | E-mail | | HU Bo | Agricultural Clean Watershed Group, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Key Laboratory for Agricultural Environment of Ministry of Agriculture, Beijing 100081, China | | | LUO Liang-guo | Agricultural Clean Watershed Group, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Key Laboratory for Agricultural Environment of Ministry of Agriculture, Beijing 100081, China | luoliangguo@caas.cn | | WU Yong-feng | Agricultural Clean Watershed Group, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Key Laboratory for Agricultural Environment of Ministry of Agriculture, Beijing 100081, China | | | WANG Yan | Institute of Agricultural Economics and Development, Chinese Academy of Agricultural Sciences, Beijing 100081, China | | | WANG Qian | Agricultural Clean Watershed Group, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Key Laboratory for Agricultural Environment of Ministry of Agriculture, Beijing 100081, China | | | WANG Na-na | Agricultural Clean Watershed Group, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Key Laboratory for Agricultural Environment of Ministry of Agriculture, Beijing 100081, China | | | YANG Lin-zhang | Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | |
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| Abstract: |
| Farmland nonpoint source pollution has been recognized as one of the important factors deteriorating water quality of Zhushan bay in Tai Lake watershed. Those growers planting grain crops, vegetables and fruits around Zhushan bay were interviewed on nutrient inputs to fa rmlands. Based on the environmental-friendly agricultural technology practices that were demonstrated, verified, and regionally extended during the 11th five-year planning period, the potential of mitigating nonpoint source pollution from farmlands around Zhushan bay in Tai Lake watershed was estimated. Results showed that, under the current acreage of growing rice-wheat, vegetables and fruits, the large-scale applications of environmental-friendly agricultural technology practices, i.e., rice-wheat fertilization reduction technology and rice-green manure rotation pattern, could further reduce inorganic N inputs by 132.4 t·a-1 and 424.3 t·a-1, and mitigate the total N load of 42.3 t·a-1 and 20 t·a-1, respectively; vegetable optimized planting mode could realize a reduction of 993.7 t·a-1 inorganic N and a mitigation of 181.3 t·a-1 total N; orchard integration mode of optimum fertilization, run-off, and pest control with clover could cut at least 1000 t·a-1 of inorganic N inputs and mitigate 116.8 t·a-1 of total N surface runoff loss. Compared with the 11th five-year planning period, the present results also showed that increasing uses of organic fertilizers could additionally reduce inorganic nitrogen inputs in local farmland. However, further re search is necessary to find the most appropriate application level of organic fertilizers for the region. This study also proposed a scale pre vention and control of farmland nonpoint source pollution around Zhushan bay in Tai Lake watershed in order to provide supports for water quality safety of Tai Lake. |
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