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| DOI：10.13522/j.cnki.ggps.2017.0187 |
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| Improving Contaminant Attenuation by Ecologically Innovating Irrigation and Drainage System at Paddy Field in Southern China |
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LIU Fangping, XIANG Ainong, CAI Shuo, SHI Hong, DENG Hailong, XU Tao, XU Yaqun
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1. Jiangxi Center Station of Irrigation Experiment, Nanchang 330201, China；2. Jiangxi Authority of Water Conservancy Project of the Ganfu Plain, Nanchang 330096, China
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| Abstract: |
| 【Objective】The aim of this paper is to analyze the efficacy of ecologically renovating irrigation and drainage system in improving contaminant attenuation in farmland.【Method】The experiment was conducted at paddy field in a village located in the Irrigation District of Ganfu Plain, where we optimized fertilizer application and irrigation and ecologically revamped its irrigation/drainage system in 2014. During the experiment, we measured irrigation amount, yield of rice, as well as the inflow and outflow in the drainage ditch and ponds.【Result】Optimizing fertilization and irrigation, along with irrigation and drainage renovation, saved water by 10.58%, reduced emission by 20.34%, and increased yield and water productivity by 6.52% and 18.59%, respectively, compared with business as usual. The reduction in total nitrogen (TN) loss and total phosphorus (TP) loss from leaching was 12.37% and 14.98%, respectively. The removal rate of TN and TP in lateral and branch ditches increased by 25.42% and 34.22% respectively; and the removal rate of TN and TP from the ponds improved by 25.19% and 30.42%, respectively. Analysis revealed that, considering the 11 500 Yuan/hm2 cost for renovation and 1 800 Yuan/hm2 cost for annual management, the net profit was 5 500 Yuan/hm2. 【Conclusion】 Optimizing fertilization and irrigation, along with facility renovation, improved the removal rate of total nitrogen (TN) and total phosphorus (TP), and reduced operational costs in the meantime. |
| Key words: paddy field; irrigation and drainage system; non-point source pollution; ecological remediation; Ganfu Plain |
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