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標題: 利用隨意渦流累積系統觀測水稻田溫室氣體CH4及CO2之探討
Fluxes of CH4 and CO2 over the rice paddy using relaxed eddy accumulation method
作者: 張晉豪
Chang, Chin-Hao
關鍵字: Flux;通量;paddy field;Relaxed Eddy Accumulation(REA);Eddy Covariance(EC);β value;水稻田;隨意渦流累積法;渦流協變性系統;β值
出版社: 環境工程學系所
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本研究以隨意渦流累積系統在水稻田觀測溫室氣體二氧化碳及甲烷的通量,觀測時間為2011/4/27 ~ 2011/5/9(水稻孕穗期),並搭配協變渦流系統的觀測資料進行分析比對。隨意渦流累積系統由過去的系統進行改良,改良的重點有:體積縮減增加機動性、增加採樣端除水裝置使採樣更精確及使用無線發送天線以減少線路等。
以二氧化碳通量、蒸發潛熱通量及可感熱通量反推β值,β值分別為0.38、0.38及0.39,以可感熱通量反推的β值回歸線性最好,其95%信賴區間為0.17 ~ 0.55,本次研究使用的β值為0.38。隨意渦流累積系統與渦流協變系統所觀測的值進行相關性分析,得到R2 = 0.5325,顯示兩個系統具一定的可信度。平均一天排放渦流協變系統約為11.8 g /(m2day),而隨意渦流累積系統約為12.6 g/( m2day)。甲烷生成菌在一定的溫度範圍內,活動力與溫度成一正相關的關係,故本研究中量測的甲烷通量有日高夜低的趨勢,其通量範圍約在0.04 ~ 0.38 μg/(m2 s)。每天排放的甲烷量約為12.92 mg /(m2day),而這次時期(11日)觀測的總排放量為138.6 mg/m2。

In this study, a field measurement of CH4 and CO2 fluxes was conducted by using the Relaxed Eddy Accumulation (REA) method and the eddy covariance (EC) technique over rice paddies at Wu-Fong Agricultural Research Institute during 2011/4/27 ~ 2011/5/9. The new REA system was modified from the previous system to improve the accuracy, which included the minimum of the system, sample dryer and the reduction of sampling tube length.
Theβ values in the REA method calculated from the fluxes of CO2, water vapor and sensible haet from the EC system were 0.38, 0.38 and 0.39, respectively. The statistical results showed that β from sensible heat flux was better than others. Therefore, β value was assigned as 0.38 in this study. The R2 of EC and REA systems was 0.5352 and therefore, it was considered reasonable and credible for the REA system. The CO2 average emissions were 11.8 g /m2/day and 2.6 g/m2/day by EC and REA, respectively. The CH4 flux measured by REA was 12.92 mg /m2/day and the total emission was 138.6 mg/m2 during study period. The methane fluxes were higher during daytime compared with those in the nighttime, which ranged for 0.04 to 0.38 μg /m2/s.
其他識別: U0005-2607201115024800
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