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題 名 | The Impact of Fog on Energy Budget of a Subtropical Cypress Forest in Taiwan=霧對亞熱帶扁柏林能量收支的影響 |
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作 者 | 夏禹九; | 書刊名 | 臺灣林業科學 |
卷 期 | 22:3 2007.09[民96.09] |
頁 次 | 頁227-239 |
分類號 | 436.12 |
關鍵詞 | 渦度相關法; 能量平衡; 霧; 森林生態系; 輻射能平衡; 扁柏森林; Eddy covariance; Energy balance; Fog; Forest ecosystem; Radiation balance; Cypress forest; |
語 文 | 英文(English) |
中文摘要 | 本文陳述棲蘭山扁柏天然更新林11天晴日及5夾霧日的能量收支量測結果。晴日及參昌最大的差異為日輻射強度;當霧籠罩之際,日輻小量最低會減少95%。使用渦度相關法量測的二氧化碳、可感熱及蒸發潛熱,顯示晴日之時能量平衡值為正值(25 W□),林分獲得能量。相反的在霧日,能量平衡值為負值(-15W□),林分喪失能量。不論在晴日或霧日能量都未完全平衡,本文對此一結果有進一步的討論,並分別檢視白天及夜間淨輻射量與可感熱、蒸發潛熱及土壤熱通量三者總和之比率。二氧化碳通量則呈現日變化,自天為負值,亦即此一林分吸收二氧化碳。在晴日二氧化碳通量平均為7.8μmole □□,而有霧時僅達-3.2μmole□□,因此晴日對此一生態系是有利的。 |
英文摘要 | Results of energy balance measurements during an 11-d period under clear weather, and a 5-d period under foggy conditions are presented. The single most important factor discriminating the 2 periods was the intensity of solar radiation. With fog, a reduction in the incoming shortwave radiation of up to 95% was found. Using the eddy covariance method, turbulent fluxes of C□,latent heat (E), and sensible heat (H), were measured. The energy balance (EB) was positive (26 W□) under clear conditions, resulting in a gain of energy for the ecosystem. In contrast, during the presence of fog, EB was negative (-15 W □) indicating a loss of energy. In both situations, the EB was not completely closed. Possible resons for this finding are discussed. The ratio of available energy and the sum of turbulent fluxes in E, H and soil heat flux (S) during the clear and foggy periods were examined for daytime and nighttime conditions. The C□ flux exhibited a diurnal cycle with negative fluxes in the daytime associated with C□ uptake by vegetation. The average C□ fluxes of -7.8 μmol □□ during clear conditions and -3.2μmol □□ during foggy conditions indicate that the ecosystem benefits from clear weather condition. |
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