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| Effects of rainfall on migration of non-point source nitrogen and phosphorus in paddy fields |
| Received:April 08, 2025 |
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| KeyWord:non-point source pollution;soil of paddy field;surface runoff;nitrogen and phosphorus loss |
| Author Name | Affiliation | E-mail | | LIU Yishu | Yingtan City Meteorological Bureau, Yingtan 335000, China
Key Laboratory of Climate Change Risk and Meteorological Disaster Prevention of Jiangxi Province/Nanchang National Climate Observatory, Nanchang 330049, China
Ji'an Key Laboratory of Ecology, Ji'an 343000, China | | | ZHANG Lijin | Climate Center of Jiangxi Province, Nanchang 330049, China
Key Laboratory of Climate Change Risk and Meteorological Disaster Prevention of Jiangxi Province/Nanchang National Climate Observatory, Nanchang 330049, China | zhanglijin2022@163.com | | JIN Xiaoyi | Yingtan City Yujiang District Meteorological Bureau, Yujiang 335200, China | | | LI Wenhui | Yingtan City Yujiang District Meteorological Bureau, Yujiang 335200, China | | | LIN Zhijian | Jiangxi Agricultural Meteorological Center, Nanchang 330049, China | |
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| Abstract: |
| In response to the demand for agricultural non-point source pollution control in the rice-growing areas of the middle and lower reaches of the Yangtze River, this study quantitatively analyzes the impact of different fertilization patterns on nitrogen and phosphorus loss in surface runoff from paddy fields under rainfall conditions, aiming to provide a scientific basis for optimizing fertilization management. The following three treatments were established in the field experiment：conventional fertilization（CK）, nitrogen reduction fertilization（KF） and comprehensive optimization fertilization（BMP） for the period 2019 to 2023. The change characteristics of runoff, nitrogen and phosphorus loss load and loss rate of each treatment were determined under the runoff event caused by rainfall in paddy fields. The results showed that there were 24-46 times·a-1 of rainfall during 5 year observation period in the paddy, and the fluctuation range of surface runoff displacement field was 2-180 mm（with a median of 31.5 mm）. When the soil water storage volume of the paddy fields approached saturation and the rainfall exceeded 6.61 mm, surface runoff was easily triggered. The loss loads of nitrogen and phosphorus（except in 2020） in CK treatment were significantly higher than those in KF and BMP treatment, with increases of 11.25%-43.19%, 11.73%-33.19% for nitrogen and 5.05%-8.92%, 5.29%-21.81% for phosphorus respectively. Among each fertilization treatment, the nitrogen loss rate（except in 2020） and phosphorus loss rate were the highest in the BMP treatment, but the CK and KF treatment were no significant difference（P>0.05）, and the nitrogen and phosphorus loss coefficients of were 1.41%-3.19% and 0.14%-1.32%, respectively. The results of a correlation analysis of the relationship between the loss of nitrogen and phosphorus were positively correlated with runoff volume, fertilizer application amount and rainfall. Among them, the nitrogen loss load and phosphorus loss load, rainfall and runoff volume all showed extremely significant positive correlations（P<0.001）. In summary, the comprehensive optimization of the fertilization pattern can effectively reduce the nitrogen and phosphorus loss load and shorten the duration of nitrogen loss risks in paddy fields under rainfall conditions. |
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