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| Analysis of seasonal distribution characteristics and pollution risk of nitrogen and phosphorus losses in double-cropping rice fields in the Poyang Lake Plain |
| Received:August 22, 2022 |
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| KeyWord:Poyang Lake Plain;double-cropping rice;nitrogen and phosphorus loss;seasonal distribution;pollution risk |
| Author Name | Affiliation | E-mail | | YANG Tao | Soil and Fertilizer & Resources and Environmental Institute, Jiangxi Academy of Agricultural Sciences, National Engineering and Technology Research Center for Red Soil Improvement, Nanchang 330200, China | | | WANG Yuqing | Agriculture and Rural Bureau of Nanchang County, Nanchang 330200, China | | | WU Huoliang | Jiangxi Agricultural Ecology and Resource Protection Station, Nanchang 330046, China | | | YU Ying | Jiangxi Agricultural Ecology and Resource Protection Station, Nanchang 330046, China | | | CHEN Jingrui | Soil and Fertilizer & Resources and Environmental Institute, Jiangxi Academy of Agricultural Sciences, National Engineering and Technology Research Center for Red Soil Improvement, Nanchang 330200, China | chenjr5526@163.com | | CHEN Xiaofen | Soil and Fertilizer & Resources and Environmental Institute, Jiangxi Academy of Agricultural Sciences, National Engineering and Technology Research Center for Red Soil Improvement, Nanchang 330200, China | | | QIN Wenjing | Soil and Fertilizer & Resources and Environmental Institute, Jiangxi Academy of Agricultural Sciences, National Engineering and Technology Research Center for Red Soil Improvement, Nanchang 330200, China | | | LIU Jia | Soil and Fertilizer & Resources and Environmental Institute, Jiangxi Academy of Agricultural Sciences, National Engineering and Technology Research Center for Red Soil Improvement, Nanchang 330200, China | liujia422@126.com | | XU Changxu | Soil and Fertilizer & Resources and Environmental Institute, Jiangxi Academy of Agricultural Sciences, National Engineering and Technology Research Center for Red Soil Improvement, Nanchang 330200, China | |
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| Abstract: |
| To better understand the seasonal distribution and pollution risk of nitrogen and phosphorus losses in double-cropping rice fields in the Poyang Lake Plain, in-situ monitoring was carried out on the "winter fallow double-cropping rice" planting pattern at the state-controlled monitoring site of Xiangtang Town, Nanchang County, Jiangxi Province, China during 2015—2019. According to the results, the runoff volume in the early rice season showed the highest proportion（39.11% – 61.50%）of the annual total during the monitoring period, followed by the winter fallow season（23.31%–54.30%）and the late rice season. The seasonal distribution of nitrogen and phosphorus losses was similar to that of the runoff volume, with a higher proportion in the early rice season than in the winter fallow season. In most monitoring years（except 2016）, however, both the runoff volume and nitrogen and phosphorus losses accounted for less than 13% of the annual total in the critical period of prevention and control（10 days after fertilization）, revealing a possibly exaggerated pollution risk in the critical period of prevention and control in double-cropping rice fields. In contrast, under extreme precipitation conditions, the proportions of runoff volume, nitrogen loss, and phosphorus loss were as high as 27.34%–52.19%, 14.21%–54.06%, and 25.38%–45.95% of the annual total, respectively, much higher than those in the critical period of prevention and control. This indicates that extreme precipitation may bring a higher risk of non-point source pollution in double-cropping rice fields. Hence, both the early rice season and the winter fallow season are important periods for the prevention and control of nitrogen and phosphorus losses in the doublecropping rice fields in the Poyang Lake Plain. Given the unpredictability of precipitation events, it may lead to risks when the prevention and control of non-point source pollution is achieved only by reducing the nitrogen and phosphorus losses in "the critical period of prevention and control". Thus, the prevention and control of nitrogen and phosphorus losses in extreme precipitation conditions is a potential key research direction for relieving non-point source pollution in double-cropping rice fields. |
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