作物学报2025，Vol.51Issue(3)：771-784,14.DOI:10.3724/SP.J.1006.2025.43034
绿肥还田条件下减氮对河西绿洲灌区玉米产量及N2O排放的影响
Effects of nitrogen reduction on maize yield and N2O emission under green manure returning in Hexi oasis irrigation area
摘要
Abstract
This study investigated the response of maize yield and N2O emission characteristics to nitrogen reduction under green manure incorporation in an oasis irrigation area.The aim was to provide a theoretical basis for developing a nitrogen application system that ensures stable yields while reducing emissions in this region.A field experiment was conducted at the Wuwei Oasis Agricultural Experimental Station of Gansu Agricultural University.Treatments included the traditional nitrogen application rate(N100)combined with green manure,and nitrogen application rates reduced by 10%,20%,30%,and 40%(N90,N80,N70,and N60,respectively)under the same green manure conditions.The results showed no significant differences in maize yield among N100,N90,and N80,but their yields were significantly higher than those of N70 and N60.The global warming potential(GWP)of N2O emissions decreased with the reduction in nitrogen application rates.Notably,the N2O emission intensity(GHGI)was lowest under N80,which was 14.3%lower than that under N100.During the maize growth period,the peak N2O emission flux occurred after fertilization,with peak values increasing as nitrogen application rates increased.Compared to N100,cumulative N2O emissions under N90,N80,N70,and N60 were significantly reduced.However,cumulative emissions under N90 and N80 were 18.0%and 9.4%higher than those under N70,and 28.6%and 19.3%higher than those under N60,respectively(P<0.05).The average concentrations of NH4+-N and NO3--N in the 0-110 cm soil layer decreased as nitrogen application rates were re-duced during the maize growth period.Compared to N100,average NH4+-N concentrations under N90,N80,N70,and N60 de-creased by 6.4%,9.9%,15.3%,and 21.3%,respectively,with significant differences.Similarly,average NO3--N concentrations decreased by 5.6%,11.5%,9.2%,and 24.5%,respectively,with significant differences.Correlation analysis revealed a positive relationship between nitrogen application rates,soil NH4+-N and NO3--N concentrations,and N2O emissions.Nitrogen application rates influenced farmland N2O emissions by regulating soil NH4+-N and NO3--N concentrations,making them the primary factors driving N2O emissions.Therefore,a 20%reduction in nitrogen application under green manure incorporation is recommended as a suitable nitrogen management strategy to achieve stable yields and emission reductions in arid oasis irrigation regions.关键词
绿肥/减氮/产量/N2O排放/铵态氮/硝态氮Key words
green manure/reducing nitrogen/yield/N2O emissions/ammonium nitrogen/nitrate nitrogen引用本文复制引用
刘亚龙,王鹏飞,于爱忠,王玉珑,尚永盼,杨学慧,尹波,张冬玲,王凤..绿肥还田条件下减氮对河西绿洲灌区玉米产量及N2O排放的影响[J].作物学报,2025,51(3):771-784,14.基金项目
本研究由国家重点研发计划项目(2022YFD1900200),国家自然科学基金项目(32160524),财政部和农业农村部国家现代农业产业技术体系建设专项(CARS-22-G-12),甘肃农业大学伏羲杰出人才培育计划项目(GAUfx-04J01)和甘肃省自然科学基金项目(22JR5RA867)资助.This study was supported by the National Key Research and Development Program(2022YFD1900200),the National Natural Science Foun-dation of China(32160524),the China Agriculture Research System of MOF and MARA(CARS-22-G-12),the Fuxi Outstanding Talent Cultivation Program of Gansu Agricultural University(GAUfx-04J01),and the Natural Science Foundation of Gansu Province(22JR5RA867). （2022YFD1900200）
