| Cite this article: | 李建强,王鸢,陈晓冬,等.降水和施肥对稻田地表径流总氮流失量的耦合作用[J].灌溉排水学报,0,():-. |
| LI Jianqiang,WANG Yuan,CHEN Xiaodong,et al.降水和施肥对稻田地表径流总氮流失量的耦合作用[J].灌溉排水学报,0,():-. |
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| Coupling effects of rainfall- fertilization on surface runoff losses of nitrogen from paddy fields |
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LI Jianqiang1, WANG Yuan2, CHEN Xiaodong2, FEI Bingyan1, GUO Bin2, LIU Chen2, Li Hua2
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1.Pinghu Agriculture and Rural Bureau;2.Zhejiang Academy of Agricultural Sciences
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| Abstract: |
| 【Objective】This study investigated the coupling effects of rainfall and fertilization on surface runoff losses of nitrogen from paddy fields to reduce nitrogen non-point source pollution in Zhejiang Province. 【Method】Four treatments were conducted in this study, which were conventional nitrogen fertilizer treatment (N18), low nitrogen fertilizer treatment (N15), organic fertilizer treatment (OF) and no fertilizer treatment (CK), respectively. The volume of surface runoff, total nitrogen concentrations in surface runoff and corresponding meteorological data were detected from 2019 to 2021 to analyze the coupling effects of rainfall and fertilization on surface runoff losses of nitrogen from paddy fields by field trials. 【Result】(1) A synchronous trend between the annual rainfall and the annual nitrogen loss flux from 2019 to 2021 was shown. However, linear regression analysis showed that the interrelations of single rainfall and the nitrogen loss flux were not significant, while the partitioned daily average rainfall was positively correlated with nitrogen loss flux (regression coefficients≥0.36). (2) The positive effects of fertilization treatments on nitrogen runoff loss were in accord with a trend of N18>N15>OF>CK. (3) The structural equation model showed that partitioned daily rainfall, rainfall interval, the interval between rainfall and fertilization, fertilization amount, and fertilization type are important factors affecting nitrogen loss flux, of which the standardized total effects were 0.264, -0.126, 0.078, 0.033 and -0.038, respectively. The results showed that the effect of rainfall on nitrogen loss flux was greater than that of fertilization. Partitioned daily rainfall and rainfall interval were the key rainfall parameters affecting nitrogen loss. 【Conclusion】In the rice-wheat rotation area of Zhejiang Province, compared with the increase of single rainfall, the shortening of rainfall interval has a stronger promoting effect on nitrogen loss from paddy fields, while the application of organic fertilizer in the wet season can reduce nitrogen loss from rice fields. |
| Key words: paddy fields;nitrogen loss;non-point source pollution;fertilization;rainfall |
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