溪頭地區二氧化碳通量之初探

Preliminary Study of CO_2 Flux in Xitou Area

賴彥任(Yen-Jen Lai) ； 洪志遠(Chih-Yuan Hong) ； 魏聰輝(Tsong-Huei Wey) ； 張振生(Cheng-Sheng Chang) ； 江博能(Po-Neng Chiang) ； 衛強(Chiang Wei) ； 余瑞珠(Jui-Chu Yu) ； 莊振義(Jehn-Yih Juang) ； 謝正義(Cheng-I Hsieh) ； 蔡明哲(Ming-Jer Tsai) ； 王亞男(Ya-Nan Wang)

《國立臺灣大學生物資源暨農學院實驗林研究報告》 26卷3期 (2012/09) Pp. 211-224

https://doi.org/10.6542/EFNTU.201209_26(3).0005

摘要

由於人為排碳造成全球暖化議題，近幾年世人逐漸重視森林碳匯減緩大氣中CO_2濃度上升速度之重要性，以渦流相關法（eddy covariance）為理論基礎進行通量塔微氣象觀測，可達成森林生態系碳匯定量化。溪頭通量測站之XT00塔自2009年5月逐步進行觀測與調整。初步分析運轉結果顯示，XT00塔溪頭測站整年平均資料獲取率為89%，其中5－7月因梅雨及雷雨造成跳電過長而中斷觀測為資料遺漏之主因。經品質分析控制後，可感熱通量平均可用資料率為77%；潛熱通量平均可用資料率為62%；CO2通量平均可用資料率為62%。另由風場特性分析中顯示溪頭具由明顯山谷風特性，夜晚山風風速較高。初步檢視溪頭柳杉人工林全年均處於碳匯狀態，年均碳存量為12.94 ton C／ha／yr。

關鍵字

全球暖化 ； 二氧化碳通量 ； 渦度相關法 ； 柳杉人工林

並列摘要

Carbon sequestration is one of the forestry functions. This function would slow down the increasing speed of CO_2 concentration caused by human carbon emission and is an expected solution for human beings in the recent years. The micro-meteorological measurement of the flux tower applied the eddy covariance method can quantify the carbon sequestration of forestry ecosystem. The XT00 tower of CO_2 flux research has started its operation in May 2009 at Xitou. The results indicate the annual mean data acquisition ratio of flux system is 89%. The major source of data lost is the interruption of electric service caused by monsoon and thunderstorm during May and July. After the data assurance and quality control processes (QA/QC) process, the useful data ratios of sensible heat flux, latent heat flux and CO_2 flux are 77%, 62% and 62% respectively. The wind character analysis has showed significant pattern of mountain/ valley breeze and higher wind speed of mountain breeze during nighttime. The preliminary result of CO_2 flux ＂Cryptomeria japonica＂ plantation in Xitou has showed the annual net ecosystem exchange (NEE) is approximately -12.94 ton C/ha/yr.

並列關鍵字

Global warming ； carbon dioxide flux ； eddy covariance method ； ＂Cryptomeria japonica＂ plantation