气象科学2025，Vol.45Issue(4)：603-613,11.DOI:10.12306/2023jms.0069
稻麦轮作农田CH4通量特征及对降雨的短期响应
CH4 flux characteristics and short-term response to rainfall in rice-wheat rotation farmland
摘要
Abstract
Based on the CH4 flux data of rice-wheat rotation farmland observed by eddy covariance method from November 2019 to October 2020 in Shouxian County,Anhui Province,this paper analyzed the CH4 flux characteristics of rice-wheat rotation farmland and its short-term response process to rainfall.Results show that the rice-wheat rotation field in Shouxian was the source of CH4,and the annual CH4 flux was about 20.52 g·m-2.The rice growth stage was about 15.71 g·m-2,accounting for 77.6％of the annual CH4 flux,and the maximum was at tillering stage(11.63 g·m-2).The CH4 flux of winter wheat growth period was about 1.20 g·m-2,and of which the jointing period(0.66 g·m-2)was the largest.The fallow period was about 3.60 g·m-2.The diurnal variation of CH4 flux of winter wheat showed a single-peak type,and the peak appeared mostly in the afternoon,while the diurnal variation of CH4 flux of the rice showed both double-peak and single-peak types.The effect of rainfall on the peak time of CH4 flux had a time lag,and the delayed effect of heavy rain in rice growth stage was the most obvious.CH4 flux was significantly correlated with rainfall.Light rain during the rice growth period increased the CH4 emission capacity,but there were no significant differences in different levels of rainfall and rainfall intensity,respectively.However,moderate rain and heavy rain during winter wheat growth period both enhanced the CH4 emission,and the farmland was prone from a CH4 sink to a CH4 source with the increase of rainfall intensity.关键词
CH4通量/稻麦轮作农田/变化特征/降雨响应Key words
CH4 flux/rice-wheat rotation farmland/change characteristics/response to rainfall分类
资源环境引用本文复制引用
方砚秋,张方敏,虞晓兰,卢燕宇,倪婷,张凯迪..稻麦轮作农田CH4通量特征及对降雨的短期响应[J].气象科学,2025,45(4):603-613,11.基金项目
江苏省碳达峰碳中和科技创新专项(BE2023400) （BE2023400）
中国气象局创新发展专项(CXFZ2023J073) （CXFZ2023J073）
江苏省研究生实践创新计划(SJCX22_0374) （SJCX22_0374）
