DOI: 10.1016/j.atmosenv.2018.02.015
Scopus记录号: 2-s2.0-85042176351
论文题名: Exploring sub-daily to seasonal variations in methane exchange in a single-crop rice paddy in central Japan
作者: Iwata H ; , Mano M ; , Ono K ; , Tokida T ; , Kawazoe T ; , Kosugi Y ; , Sakabe A ; , Takahashi K ; , Miyata A
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 179 起始页码: 156
结束页码: 165
语种: 英语
英文关键词: CH4 flux
; Convective throughflow
; Eddy covariance technique
; Plant-mediated gas transport
; Submerged field
Scopus关键词: Environmental engineering
; Methane
; Soils
; Temperature
; Temperature distribution
; Water levels
; Wind
; Wind effects
; CH4 flux
; Eddy covariance technique
; Gas transport
; Submerged field
; Throughflow
; Plants (botany)
; methane
; aerenchyma
; air temperature
; Article
; atmospheric pressure
; circadian rhythm
; Eddy covariance
; gas transport
; humidity
; Japan
; nonhuman
; oxidation
; priority journal
; rice
; seasonal variation
; soil temperature
; soil water content
; solar radiation
; surface property
; vegetation
; water temperature
; water vapor
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Season-long methane (CH4) exchange was observed in a rice paddy field in central Japan (Kanto Region) using the eddy covariance technique to clarify the variations in environmental controls on CH4 exchange in different stages of cultivation. Before heading of rice plant, the CH4 emission depended on wind speed and soil temperature. The soil temperature dependence can be due to an increase in CH4 production, higher molecular diffusion, and higher conductance within rice plant at higher soil temperature. An occurrence of ebullitive emission was also suggested from the wind speed dependence. After heading was completed, relative humidity and water temperature influenced CH4 emission. The amplitude of the diurnal variation in emission increased from 0.03μmolm−2s−1 in the late pre-heading stage to 0.13μmolm−2s−1 in the post-heading stage. Induced convective throughflow within the rice aerenchyma after the change in plant structure was attributable to this variation in environmental controls after the heading. After drainage, CH4 emission was confined to short periods after strong rain events. The water level controlled the timing of emission, most likely by influencing the diffusion efficiency from the anoxic soil to the atmosphere and CH4 oxidation in the surface oxic zone. The variation in the dominant transport pathway needs to be accounted for in terrestrial ecosystem models to accurately predict CH4 emission from rice paddies. © 2018 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/82945
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Environmental Sciences, Faculty of Science, Shinshu University, Matsumoto, Nagano, Japan; Graduate School of Horticulture, Chiba University, Matsudo, Chiba, Japan; Institute for Agro-Environmental Sciences, NARO, Tsukuba, Ibaraki, Japan; Graduate School of Agriculture, Kyoto University, Kyoto, Kyoto, Japan; Research Institute for Sustainable Humanosphere, Kyoto University, Uji, Kyoto, Japan
Recommended Citation:
Iwata H,, Mano M,, Ono K,et al. Exploring sub-daily to seasonal variations in methane exchange in a single-crop rice paddy in central Japan[J]. Atmospheric Environment,2018-01-01,179