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| Research on removal effects of pond wetland system on nitrogen and phosphorus in paddy field drainage |
| Wu Jun1,2, Cui Yuanlai1, Zhao Shujun1, Tong Xiaoxia1,3 |
| 1.State Key Laboratory of Water Resources and Hydropower Science, Wuhan University, Wuhan, Hubei 430072, China; 2.Chengdu Engineering Corporation, HydroChina, Chengdu, Sichuan 610072, China; 3. Department of Soil and Water Conservation, Yangtze Ri-ver Scientific Research Institute, Wuhan, Hubei 430010, China |
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Abstract To determine the removal effects of lotus pond wetlands on nitrogen and phosphorus(N&P)in the paddy field drainage, an in-situ field experiment was conducted in Jiangxi Central Irrigation Experimental Station. The main goal of the experiment is to determine the best area ratio β of lotus pond wetlands to farmlands(most paddy field)and the best WRT(water retention time)for effective N&P reduction. Results show that, lotus wetlands have significant effects on N&P reduction, taking removal rate index of TN,NH+4-N,NO-3-N,TP as targets. The removal rates were generally increased with WRT extend at the first three to four days after drainage water putting in, and the increase of removal rates weren't obvious after that, which means the best WRT is three days. Lotus wetlands during seedling formation or flowering fruit bearing growing stage have much better removal effects on N&P than rhizome bearing growing stage. Based on the datum of seedling formation and flowering fruit bearing growing stage, the removal efficiency of TN,NH+4-N,NO-3-N were in sequence of SD1>SD2>SD3. Although the difference between SD1 and SD2 was not significant, they were both much higher than SD3. The removal effects on phosphorus had no significant difference among the three different β wetlands. Considering both economic and N&P removal efficiency, 1∶6 of SD2 is the best β in local area. With three days WRT in SD2, the average removal rate of TN,NH+4-N,NO-3-N and TP is respectively 72.5%,71.7%,55.6% and 69.5% during seedling formation and flowering fruit bearing growing stage of lotus.
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Received: 26 January 2013
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