北京水务Issue(6)：24-31,8.DOI:10.19671/j.1673-4637.2024.06.005
丰水年施氮对白萝卜农田温室气体排放及土壤氮素分布影响
Effects of nitrogen application on greenhouse gas emissions and soil nitrogen distribution in radish farmland during wet year
摘要
Abstract
To provide a basis for determining the optimal nitrogen application strategy for white radish during wet year,this research analyzed yield,nitrogen distribution in soil,and greenhouse gas emission in open-field white radish by setting up three different nitrogen application treatments:N1,N2,and N3.The results revealed that excessive precipitation could reduce the yield of white radish.Compared with the normal precipitation year,the yield of the control group decreased by 9％,and the yields of N1,N2 and N3 nitrogen treatments decreased by 25.2％,30.3％,and 31.9％compared with the control group.The chang-es of nitrogen absorption of white radish were similar to the change of yield,which showed that the nitro-gen application group had a lower absorption than that of the control group.Nitrogen application could greatly increase soil nitrate nitrogen content,but had no obvious effect on soil ammonium nitrogen con-tent.The release rate of N2O was affected by nitrogen application and rainfall,and the cumulative emis-sions of N2O from N1,N2 and N3 were 1.7,1.7 and 1.9 times that of the control group,respectively.Nitro-gen application notably increased global warming potential(GWP)by 586.64～673.66 kg CO2-eq/hm2 per growing season,and the greenhouse gas emission intensity(GHGI)of white radish also rose significantly.Therefore,when precipitation exceeds the water demand of white radish,a strategy of non-nitrogen appli-cation is the optimal management mode.关键词
白萝卜/产量/温室气体排放/土壤氮素分布/增温潜势Key words
white radish/yield/greenhouse gas emission/soil nitrogen distribution/global warming po-tential(GWP)分类
农业科技引用本文复制引用
徐可,范海燕,刘娣,杨默远,刘洪禄..丰水年施氮对白萝卜农田温室气体排放及土壤氮素分布影响[J].北京水务,2024,(6):24-31,8.基金项目
国家重点研发计划(2019YFC0408700) （2019YFC0408700）
