Determination of methane and carbon dioxide fluxes during the rice maturity period in Taiwan by combining profile and eddy covariance measurements
Determination of methane and carbon dioxide fluxes during the rice maturity period in Taiwan by combining profile and eddy covariance measurements
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DOI：
10.1016/j.agrformet.2010.04.007
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发表时间：
2010-06
影响因子：
6.2
通讯作者：
K. Tseng;Jeng-Lin Tsai;A. Alagesan;B. Tsuang;M. Yao;Pei-Hsuan Kuo
中科院分区：
文献类型：
--
作者：
K. Tseng;Jeng-Lin Tsai;A. Alagesan;B. Tsuang;M. Yao;Pei-Hsuan Kuo
本研究以台湾中部一稻田为研究对象，利用通量梯度法，探讨甲烷之通量。在活动期间，CH4在低层（22.2m）和高层（27.5m）的平均观测浓度分别为2.04ppm和2.01ppm。结果表明，白天CH4浓度低于夜间。然而，CH4的通量被观察到是在白天的时间比在夜间高。为了了解气象因子对CH4排放通量影响的关系，对6个气象因子进行了研究。土壤热通量与甲烷通量呈线性正相关。在研究期间，水稻成熟期，稻田生态系统表现为CH4和CO2的来源。在100年的时间框架内，该研究站点观测到的CH4和CO2的全球变暖潜势（GWP）通量分别为0.16和0.71μ molCO2当量sm −2s−1，总GWP通量（CH4和CO2）为0.86μ molCO2当量sm −2s− 1，其中CH4和CO2的贡献分别为18%和82%。
A field campaign was undertaken over a rice paddy in Central Taiwan to investigate the flux of CH4through the flux-gradient method. During the campaign period, the average observed concentrations of CH4during the campaign period at the lower height (22.2m above ground level, agl) and upper height (27.5magl) were around 2.04ppm and 2.01ppm, respectively. It was noticed that the profile concentration of CH4was lower during day time when compared to night time. However, the flux of CH4was observed to be higher during the day time than during night hours. In order to understand the relationship between the influences of meteorological variables on the flux of CH4, six meteorological variables were studied. It was observed that soil heat flux has a linear positive correlation with the flux of CH4. During the study period, the maturity stage of rice paddy, the rice paddy ecosystem was behaving as sources of CH4and CO2. Over a 100-year time frame, the global warming potential (GWP) fluxes of CH4and CO2observed at this study site were 0.16 and 0.71μmolCO2equivalentsm−2s−1, respectively.The total GWP flux (CH4and CO2) was 0.86μmolCO2equivalentsm−2s−1in which CH4and CO2contribute 18% and 82%, respectively.