| Cite this article: | 吴庆峰,郑佳舜,肖未,等.不同时期施肥对稻田田面水无机氮和N2O通量的影响[J].灌溉排水学报,0,():-. |
| WU Qingfeng,ZHENG Jiashun,XIAO Wei,et al.不同时期施肥对稻田田面水无机氮和N2O通量的影响[J].灌溉排水学报,0,():-. |
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| Effects of Fertilization at Different Stages on Inorganic Nitrogen and N2O Fluxes in Surface Water of Paddy Fields |
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WU Qingfeng, ZHENG Jiashun, XIAO Wei, LI Fusheng
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College of Agriculture,Guangxi University
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| Abstract: |
| 【Objective】The objective of this study was investigate the effect of fertilization at different growth stages on the contents of inorganic nitrogen (N) and the fluxes of nitrous oxide (N2O) in paddy water and the effect of inorganic N in paddy water on N2O fluxes under different tillage and N fertilization treatments. 【Methods】Field experiments of double-cropping rice were carried out with four tillage methods (no tillage T, micro tillage C, rotary tillage R and smash ridging tillage S) and two N rates (conventional N rate N1 225 kg/hm2 and reduced N rate N2 150 kg/hm2). The contents of inorganic nitrogen in surface water and N2O flux in paddy field were measured at 1, 3 and 5 days after fertilization during different growth stages and the correlations between inorganic nitrogen content in surface water and N2O flux at 1, 3 and 5 days after fertilization during different growth stages were analyzed. 【Results】(1) Ammonium nitrogen (NH4+-N) after fertilization at different growth stages was higher in surface water. After fertilization, NH4+-N in surface water increased to the peak value and then decreased rapidly. After applying basal fertilizer, tillering fertilizer and earring fertilizer, he contents of nitrite nitrogen (NO2--N) in surface water of all treatments were low, not higher than 0.12 μg/ml. (2) After applying basal fertilizer, tillering fertilizer and earring fertilizer, the N2O flux of TN2 treatment was lower than that of other treatments. (3) The N2O fluxes in paddy field were significantly negatively correlated with the ammonium nitrogen content in surface water at 1-5 days after fertilization, with the correlation coefficients of -0.300 - -0.509. 【Conclusion】(1) NH4+-N was the main form of inorganic nitrogen in surface water after fertilization at different growth stages. After fertilization, the NH4+-N in surface water decreased rapidly after reaching the peak value. (2) After applying base fertilizer, tillering fertilizer and earring fertilizer, TN2 treatment was a mode of tillage method and nitrogen application that can reduce N2O emission. (3) Ammonium nitrogen in surface water at 1-5 days after fertilization affected N2O flux in paddy field. |
| Key words: Tillage method; Nitrogen rate; Inorganic nitrogen; N2O emission; Paddy soil |
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