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CH4 emissions from a double-cropping rice field in subtropical China over seven years

文献类型：期刊论文

作者Liu, Xiao; Dai, Xiaoqin; Yang, Fengting; Meng, Shengwang; Wang, Huimin
刊名AGRICULTURAL AND FOREST METEOROLOGY
出版日期2023-08-15
卷号339页码:109578
ISSN号0168-1923
关键词Double rice Eddy covariance Long-term observation
DOI10.1016/j.agrformet.2023.109578
产权排序1
文献子类Article
英文摘要Rice paddies are important sources of the greenhouse gas methane (CH4). However, it is difficult to precisely quantify CH4 emissions using the static chamber method because of their discontinuous measurements as well as the spatial and temporal variability of CH4 emissions. To precisely quantify CH4 emissions from rice paddies and gain deep insight into the emission rhythm and environmental effects, a seven-yearlong CH4 flux measurement was carried out continuously using the eddy covariance method in a double cropping rice paddy in subtropical China. The annual CH4 emissions were 42 & PLUSMN; 2 g C m- 2. The half hourly CH4 flux was highly correlated with gross primary production (GPP) and environmental factors, such as soil temperature (Ts), and latent heat flux (LE), which explain 47-91% of the CH4 diurnal variation. However, the peak of CH4 generally appeared at dusk during the vigorous growth period, which was quite different from the GPP peak around noon. CH4 flux seasonal dynamic were more complex, with double peaks during the growing season and lower values during the fallow season. Interestingly, in contrast to previous studies of linear or exponential relationships with short-term datasets, daily CH4 and GPP showed a logarithmic relationship at the vegetative stage in this study with seven-year data, this is crucial in improving the model accuracy in estimating annual CH4 emissions. The result implies that long-term observation is necessary to accurately assess CH4 emissions from rice paddy.
WOS关键词GREENHOUSE-GAS EMISSIONS ; SCALE METHANE EMISSION ; EDDY COVARIANCE METHOD ; TEMPERATURE-DEPENDENCE ; ATMOSPHERIC METHANE ; CARBON-DIOXIDE ; FLUX ; PADDY ; CO2 ; NORTHERN
WOS研究方向Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种英语
出版者ELSEVIER
WOS记录号WOS:001039263000001
源URL[http://ir.igsnrr.ac.cn/handle/311030/194517]  
专题千烟洲站森林生态系统研究中心_外文论文
作者单位1.University of Chinese Academy of Sciences, CAS
2.Institute of Geographic Sciences & Natural Resources Research, CAS
3.Chinese Academy of Sciences
推荐引用方式
GB/T 7714		 Liu, Xiao,Dai, Xiaoqin,Yang, Fengting,et al. CH4 emissions from a double-cropping rice field in subtropical China over seven years[J]. AGRICULTURAL AND FOREST METEOROLOGY,2023,339:109578.
APA Liu, Xiao,Dai, Xiaoqin,Yang, Fengting,Meng, Shengwang,&Wang, Huimin.(2023).CH4 emissions from a double-cropping rice field in subtropical China over seven years.AGRICULTURAL AND FOREST METEOROLOGY,339,109578.
MLA Liu, Xiao,et al."CH4 emissions from a double-cropping rice field in subtropical China over seven years".AGRICULTURAL AND FOREST METEOROLOGY 339(2023):109578.

入库方式： OAI收割

来源：地理科学与资源研究所

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