Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/5885
標題: 紊流協變系統之全年度水稻田甲烷通量觀測及模擬
State-of-art observation and simulation of the methane flux from a rice paddy.
作者: 鄭丞孝
Cheng, Cheng-Hsiao
關鍵字: 渦流協變系統
eddy covariance system
甲烷通量
methane flux
出版社: 環境工程學系所
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摘要: 本研究利用渦流協變系統(Eddy Covariance system, EC)觀測全年度水稻田甲烷通量且藉由微氣象觀測數據探討各項氣象因子與甲烷通量的相關性,並透過Denitrification-Decomposition (DNDC)模式模擬甲烷通量的變化與觀測的差異性。 為了解全年度不同生長季節水稻田甲烷通量的變化,實驗場址選在台中霧峰農試所85號試驗田進行甲烷通量觀測,觀測期間分別為2012年2/22~6/5的一期稻作、6/7~7/18的休耕期、7/25~10/30的二期稻作、12/1~2013年3/6的休耕期以及3/7~6/17的一期稻作。除了利用渦流協變系統以10 Hz頻率觀測甲烷、水氣濃度外,長短波輻射、土溫、土壤含水率亦同時記錄。結果顯示,三期水稻作皆在插秧開始至水稻分糵期間(約40~50天)為甲烷通量在整個生長期的高峰值,2012年第一期約在-1~13 μg m-2 s-1,第二期約在約在-2~17 μg m-2 s-1,2013年第一期約在-2~16 μg m-2 s-1,分糵期過後,甲烷通量迅速減小約10倍,2012年第一期約在-1.3~1.9 μg m-2 s-1,第二期約在-1.0~2.3 μg m-2 s-1,2013年第一期約在-1.2~0.5 μg m-2 s-1,透過微氣象觀測與農作行程了解水稻田甲烷通量與土壤中快速分解之有機質、土壤含水率具有相關性。最後以具有生物化學基礎之DNDC模式發現甲烷通量的變化趨勢與觀測值具有類似的情形,代表DNDC模式對於台灣區水稻田甲烷排放是具有可行性的。甲烷的排放係數:2012年第一期為 84.3 kg CH4 ha-1 ,第二期為 51.4 kg CH4 ha-1,2013年第一期為 70.2 kg CH4 ha-1。雖然與各國家在觀測方法、氣候、耕作方式與施加的肥料上各有差異性,整體來看與其他國家的季排放量為合理的情況。
In this study, an eddy covariance system (EC) was used to observe the methane fluxes at paddy fields for one year. In addition, the relationships between the methane fluxes and the meteorological factors were evaluated and therefore, the radiation, soil temperature and soil moisture were measured, and finally, the methane fluxes were simulated by using Denitrification-Decomposition (DNDC) model and the results were compared with the observations. The experimental site was located at paddy fields in the Wu-Fong Agricultural Research Institute and the experimental period contains the first cropping season (22 Feb., 2012 to 5 June, 2012 and 7 Mar., 2013 to 17 June 17, 2013), the fallow period(7 June, 2012 to 18 July, 2012 and 1 Dec., 2012 to 6 Mar., 2013) and the second cropping season(25 July, 2012 to 30 Oct., 2012). The results showed that methane fluxes have high values at the active tillering stage (about 40 to 50 days from the transplating) for the three cropping seasons. At the first cropping season, the fluxes were -1 ~ 13 μg m-2 s-1 in 2012 and -2 ~ 16 μg m-2 s-1 in 2013. At the second cropping season in 2012, the flux was -2 ~ 17 μg m-2 s-1. However, after the active tillering stage, the methane flux reduced rapidly to a level about 10 times smaller than those at the active tillering stage, in which the fluxes were -1.3 ~ 1.9 μg m-2 s-1 in 2012 and -1.2 ~ 0.5 μg m-2 s-1 in 2013. At the second cropping season in 2012, the flux was -1.0 ~ 2.3 μg m-2 s-1. In addition, this study showed that methane fluxes had the significant correlation with the soil organic matter and soil moisture content. Finally, DNDC model can produce a similar trend compared with the observation. Over all, the emission factors of the methane in this study were 84.3 kg CH4 ha-1 at the first cropping season in 2012, 51.4 kg CH4 ha-1 at the second cropping season in 2012 and 70.2 kg CH4 ha-1 at the first cropping season in 2013. The observed result was also compared with those measured at other countries with different meteorological conditions and practice managements.
URI: http://hdl.handle.net/11455/5885
其他識別: U0005-0608201314503900
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0608201314503900
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