Greenhouse gas emissions and ammonia loss of maize fertigation with a centre pivot system in the North China Plain
Greenhouse gas emissions and ammonia loss of maize fertigation with a centre pivot system in the North China Plain
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DOI：
10.1002/ird.2826
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发表时间：
2023-03
影响因子：
1.9
通讯作者：
Xin-rui Fan;Wei-xia Zhao;Jiusheng Li
中科院分区：
文献类型：
--
作者：
Xin-rui Fan;Wei-xia Zhao;Jiusheng Li
喷淋施肥是否刺激温室气体排放和氨损失是氮素管理不可缺少的考虑因素。为评价喷淋施肥对夏玉米N2O、CH4、CO2和NH3排放的影响，在2020年和2021年两季分别试验了局部经验值法、矿物氮法和改良矿物氮法3种氮素推荐方法，以及间歇降雨条件下不追肥、一次追肥和两次追肥3种方法。采用地表放肥灌溉作为对照处理。结果表明：施氮和降雨促进了土壤N2O、CO2和NH3的排放，但对CH4的排放影响不明显；氮肥施用量的增加增加了N2O和NH3的气态氮损失量。改良矿物氮喷施法和两种追肥的产量和氮肥利用效率最高。与对照处理相比，喷淋施肥处理的产量和氮利用效率最高提高了20%，累计NH3挥发损失率和气态氮损失率均降低了16%，累计N2O排放量增加了4%。各处理间全球变暖潜势无显著差异。
Whether sprinkler fertigation stimulates greenhouse gas emissions and ammonia loss is an indispensable consideration for nitrogen management. To assess the effect of sprinkler fertigation on N2O, CH4, CO2 and NH3 emissions, three N recommendation methods for summer maize, including the local empirical value, mineral nitrogen method and modified mineral nitrogen method, and three topdressing methods, including no topdressing, one topdressing and two topdressings following intermittent rainfall events, were tested in the 2020 and 2021 seasons. Surface irrigation with fertilizer broadcasting was used as the control treatment. The results indicated that nitrogen topdressing and rainfall promoted soil N2O, CO2 and NH3 emissions but had no obvious effect on CH4 emissions. The increasing nitrogen application rate increased gaseous nitrogen losses of N2O and NH3. Sprinkler fertigation with the modified mineral nitrogen method and two topdressings obtained the greatest yield and nitrogen use efficiency. Compared to the control treatment, the yield and nitrogen use efficiency in the sprinkler fertigation treatments was maximally increased by 20%, and the cumulative NH3 volatilization losses and gaseous nitrogen loss rate were both reduced by 16%, while the cumulative N2O emissions increased by 4%. No significant difference in global warming potential was obtained among all treatments.