中国生态农业学报（中英文）2025，Vol.33Issue(3)：498-507,10.DOI:10.12357/cjea.20240246
大气CO2浓度和温度升高下小麦季施用缓释氮肥对大豆季N2O排放的后效作用
Residual effects of slow-release nitrogen fertilizer application during the wheat growing season on N2O emission in soybean season under co-elevated atmospheric CO2 concentration and temperature
摘要
Abstract
Farmland N2O emission is a popular topic in climate change research.Climate change(elevated CO2 concentrations and in-creased temperatures)and farmland management measures are key factors affecting N2O emissions in soil.Slow-release fertilizers are considered to have a positive effect on reducing N2O emissions.It is unclear how the interaction between climate change and slow-release fertilizers affects N2O emissions.Thus,we combined the local wheat-soybean cultivation model to investigate the potential impact of applying slow-release fertilizers on soil N2O emissions during the growth season of subsequent crop under elevated CO2 concentrations and increased temperatures.In this study,two air temperatures(ambient temperature and ambient temperature+2℃)and two CO2 concentrations(400 and 600 μmol·mol-1)were set in the controlled chambers.Two fertilizers(conventional urea and slow-release urea)were applied during the wheat season under various environmental treatments in a wheat-soybean rotation system.Still,no fertilizer was used during the soybean growing season.CK referred to the ambient CO2 concentration and temperature simu-lated in the controlled chamber(the ambient environmental CO2 concentration in this experiment was 400 μmol·mol-1,and the envir-onmental temperature was controlled by the intelligent control system to be consistent with the external environment).N2O emissions during the entire growth period of soybean,soil ammonium nitrogen and nitrate nitrogen contents,and activities of soil enzymes in-volved in nitrification and denitrification during the seed filling and mature stages of soybean were measured.The results indicated that N2O emissions from soybean-grown soil were mainly concentrated during the later growth period of soybean.Compared to the application of conventional urea,the application of slow-release fertilizer in wheat-grown soil reduced total N2O emissions by 38.46%during the soybean growth period under increased temperature treratment(ET),whereas the application of slow-release fertilizer in-creased total N2O emissions in soybean-grown soil by 80.76%,82.35%,and 11.96%under the CK,elevated CO2 concentration(EC),and co-elevation of atmospheric CO2 concentration and temperature(ECT)treatments,respectively.Compared to CK treatment,ET treatment accelerated the conversion of ammonium nitrogen to nitrate nitrogen in soybean-grown soil at the seed filling stage,enhan-cing nitrate reductase activity and increasing N2O emissions.In addition,EC treatment had no significant effect on N2O emissions from soybean-grown soil compared to the CK treatment.Compared with CK,the nitrate nitrogen content in soybean-grown soil under ECT treatment increased slightly at the seed filling stage and mature stage,and the ammonium nitrogen content increased signific-antly at the mature stage.In the seed filling stage,the increase of nitrate reductase activity promoted N2O emissions,and in the ma-ture stage,the increase of nitrate nitrogen and ammonium nitrogen promoted N2O emissions.However,with the application of con-ventional urea,there was no significant difference in N2O emissions in soybean-grown soil between ECT and ET treatments.In con-clusion,N2O emissions did not increase with elevated CO2 concentration alone.N2O emissions were expected to increase under elev-ated temperatures in the future,and the rational application of slow-release fertilizers in wheat-grown soil can reduce N2O emissions in soybean-grown soil.Our study highlights that slow-release fertilizers have greater potential to reduce N2O emissions under climate change scenarios.关键词
小麦-大豆轮作/大豆季/温度升高/CO2 浓度升高/缓释肥/土壤氮素/N2O排放/酶活性Key words
wheat-soybean rotation system/soybean season/elevated temperature/increased CO2 concentration/slow-release fertil-izer/soil nitrogen/N2O emission/enzyme activity分类
农业科学引用本文复制引用
韩语燕,白海霞,段若男,郝兴宇,张东升,宗毓铮,史鑫蕊,李萍..大气CO2浓度和温度升高下小麦季施用缓释氮肥对大豆季N2O排放的后效作用[J].中国生态农业学报（中英文）,2025,33(3):498-507,10.基金项目
国家自然科学基金项目(31971773)和山西农业大学农学院研究生教育改革与质量提升工程项目(2023YCX29,2023YCX42)资助 This study was supported by the National Natural Science Foundation of China(31971773)and the Graduate Education Reform and Quality Improve-ment Program of College of Agriculture,Shanxi Agricultural University(2023YCX29,2023YCX42). （31971773）
