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| Characteristics of nitrogen and phosphorus runoff losses in organic and conventional rice-wheat rotation farmland in Taihu Lake Region |
| Received:January 21, 2016 |
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| KeyWord:rice-wheat rotation;organic cultivation;farmland;surface runoff;loss of nitrogen and phosphorus |
| Author Name | Affiliation | E-mail | | CHEN Qiu-hui | Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection of PR China, Nanjing 210042, China | | | XI Yun-guan | Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection of PR China, Nanjing 210042, China | xygofrcc@126.com | | WANG Lei | Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection of PR China, Nanjing 210042, China | | | LI Yan | Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection of PR China, Nanjing 210042, China | | | ZHANG Chi | Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection of PR China, Nanjing 210042, China | | | TIAN Wei | Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection of PR China, Nanjing 210042, China | | | TIAN Ran | Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection of PR China, Nanjing 210042, China | | | XIAO Xing-ji | Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection of PR China, Nanjing 210042, China | | | ZHAO Ke-qiang | Nanjing Institute of Environmental Sciences of the Ministry of Environmental Protection of PR China, Nanjing 210042, China | |
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| Abstract: |
| In order to explore the effects of different cultivation patterns(conventional and organic cultivation) on nitrogen and phosphorus losses, a 2-year field experiment was conducted by building runoff ponds in farmland. The concentrations of nitrogen and phosphorus in runoff from the conventional and organic rice-wheat rotation farmland in Taihu Lake Region were analyzed. Results showed that the average concentrations of total nitrogen(TN), soluble nitrogen, ammonium, nitrate and TN in runoff were in order of conventional cultivation > organic cultivation > control. The TN loss coefficients in organic fields were significantly lower than those in the conventional fields. Runoff losses of TN from rice-wheat rotation under the organic cultivation and conventional cultivation were 24.42~52.30 kg·hm-2 and 54.84~78.21 kg·hm-2, respectively, with TN losses lower in organic fields decreased by 33.13%~55.47%. Total N runoff loss under organic cultivation in rice and wheat seasons decreased respectively by 19.27%~25.10% and 40.29%~67.58%, suggesting that effective of reducing N runoff loss in wheat season was better than in rice season. Although the TP loss coefficients in organic fields were lower than that in conventional fields, higher P amount in organic fertilizer led to the increase of P runoff loss from organic cultivation system. |
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