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
徐可 1范海燕 2刘娣 3杨默远 2刘洪禄2
作者信息
- 1. 河海大学 江苏 南京 210024;中国能源建设集团广东省电力设计研究院有限公司 广东 广州 510520
- 2. 北京市水科学技术研究院 北京 100048;北京市非常规水资源开发利用与节水工程技术研究中心 北京 100048
- 3. 河海大学 江苏 南京 210024
- 折叠
摘要
为确定丰水年降水条件下白萝卜最优施氮策略,以露地白萝卜为研究对象,通过设置3个不同的施氮处理N1、N2和N3,分析施氮量对白萝卜农田产量、土壤氮素分布及N2O等温室气体排放的影响.结果显示:过量降水会导致白萝卜减产,对照组产量相较于正常降水条件降低了 9％,N1、N2和N33个施氮处理产量较对照组分别下降了 25.2％、30.3％和31.9％;白萝卜氮素吸收量变化与产量变化相近,表现为施氮组吸收量低于对照组;施氮能大幅提升土壤NO3--N含量,但对于土壤NH4+-N含量没有太大影响;N2O释放速率受施氮及降雨影响,N1、N2和N3的N2O累计排放量分别为对照组的1.7、1.7及1.9倍;施氮能够显著提升全球增温潜势,提升幅度为每个生长季586.64～673.66 kgCO2-eq/hm2;因此,白萝卜在降水量超作物需水量的情况下,不施氮是最优的降氮减排管理模式.
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)引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据