农业资源与环境学报2025，Vol.42Issue(3)：781-791,11.DOI:10.13254/j.jare.2024.0123
"元麦-稻"轮作体系短期温室气体排放及经济效益评价
Short-term greenhouse gas emission and economic benefit evaluation of'naked barley-rice'rotation system
摘要
Abstract
In order to accurately estimate the greenhouse gas emissions from paddy fields and screen a reasonable rice-wheat rotation model.The study took the rice-wheat rotation system in the lower reaches of the Yangtze River as the research object,four rice-wheat rotation modes were established based on the characteristics of varieties and the arrangement of stubbles,including Suluomai 2-transplanted Nanjing 46(A),Suluomai 2-direct sowing Nanjing 5055(B),Yangmai 29-transplanted Nanjing 5055(C)and Yangmai 29-direct sowing Nanjing 9108(D).Field CH4 and N2O emissions were monitored from November 2021 to October 2022 using static chamber-gas chromatographic techniques to compare and analyze the characteristics of greenhouse gas emissions in different rotation modes.By calculating the global warming potential(GWP),greenhouse gas intensity(GHGI)and net warming potential(GWPnet),the rice-wheat rotation model with environmental friendliness and high economic benefits was comprehensively evaluated and screened.The results showed that there were significant differences in CH4 and N2O emissions and greenhouse effect among different rotation systems.The yield of combination B with annual conservation tillage was the lowest,which was 0.86%-4.29%lower than that of A,C and D,and the cost was the lowest,which was 28 619.42 yuan·hm-2.Besides,the output value and income of combination B were significantly increased by 6.22%-10.11%and 72.88%-73.18%(P<0.05),respectively,compared with the wheat-rice model.In addition,the annual accumulative CH4 emission,annual GWP,unit yield emission intensity(GHGIY),unit income emission intensity(GHGII)and GWPnet of combination B were all the lowest.The annual GWP and GHGIY of combination B were significantly lower than those of A and C by 63.59%,46.42%and 62.12%,44.02%(P<0.05),respectively,and GHGII decreased by 55.36%-69.01%compared with the other three combinations(P<0.05).Furether more,the soil carbon pool(SOCP)of combination B increased significantly,and the GWPnet was-0.28 t·hm-2(calculated in CO2-eq),showing a'sink'of greenhouse gases.Visibly,according to the trade-off between greenhouse effect and crop yield and benefit,the greenhouse effect of'Suluomai 2-direct sowing Nanjing 5055'combination was relatively weak,the yield stability was relatively high,and the output value benefit was more prominent,which could be used as the main rotation type of low carbon emission reduction in rice-wheat rotation area along lower reaches of the Yangtze River.关键词
"元麦-水稻"轮作体系/甲烷/氧化亚氮/全球增温潜势/温室气体强度/经济效益Key words
naked barley-rice rotation system/methane/nitrous oxide/global warming potential/greenhouse gas intensity/economic benefit分类
农业科学引用本文复制引用
石吕,石晓旭,韩笑,刘旭杰,单海勇,薛亚光,刘建,魏亚凤.."元麦-稻"轮作体系短期温室气体排放及经济效益评价[J].农业资源与环境学报,2025,42(3):781-791,11.基金项目
江苏省农业科技自主创新资金项目[CX(23)1035-2] （23）
国家重点研发计划子课题(2016YFD0300903-02) （2016YFD0300903-02）
南通市社会民生重点项目(MS22021037) （MS22021037）
南通市社会民生面上项目(MS22022095) Jiangsu Agricultural Science and Technology Innovation Fund[CX(23)1035-2] （MS22022095）
Sub-project under National Key Research and Development Program of China(2016YFD0300903-02) （2016YFD0300903-02）
Nantong City Social Livelihood Key Project(MS22021037) （MS22021037）
Nantong City Social Livelihood General Project(MS22022095) （MS22022095）
