日本地球惑星科学連合2015年大会

講演情報

インターナショナルセッション(口頭発表)

セッション記号 H (地球人間圏科学) » H-TT 計測技術・研究手法

[H-TT09] GIS

2015年5月25日(月) 14:15 〜 16:00 101A (1F)

コンビーナ:*小口 高(東京大学空間情報科学研究センター)、村山 祐司(筑波大学大学院生命環境科学研究科地球環境科学専攻)、柴崎 亮介(東京大学空間情報科学研究センター)、吉川 眞(大阪工業大学工学部)、座長:村山 祐司(筑波大学大学院生命環境科学研究科地球環境科学専攻)、小口 高(東京大学空間情報科学研究センター)

14:51 〜 14:54

[HTT09-P03] The annual net ecosystem exchange in a subtropical broadleaf plantation in southern Taiwan.

ポスター講演3分口頭発表枠

*Yenjen LAI1Jui-chu YU1Cheng-sheng CHANG1Jiquan CHEN2Ming-jer TSAI3Ya-nan WANG3 (1.The Experimental Forest, National Taiwan University, Taiwan、2.IceMe, Nanjing University of Information Science & Technology, China; and University of Toledo, USA、3.School of Forestry and Resource Conservation, National Taiwan University, Taiwan)

キーワード:carbon dioxide flux, eddy covariance, net ecosystem exchange (NEE), plantations of multiple broadleaf species, footprint

Carbon flux of regenerating vegetation is considered as a major factor in determining the sequestration strength and associated uncertainty of terrestrial ecosystems and its role in slowing down the increase of atmospheric CO2 concentration. In the purpose to quantify the long-term net exchanges of carbon, water, and energy between the broadleaf plantation and the atmosphere, this study picked an existed reforested sugar cane farm which was reforested by multiple broadleaf species from 2002 to 2005 in Pingdong, southern Taiwan as a field site and installed an open-path eddy-covariance tower since 2008. The tower-based annual net ecosystem exchange (NEE) were -1.0, 1.3, 0.5, and -1.0 Mg C ha-1yr-1 for 2009-2012, respectively. However, these results were conflicted with biometric investigation. A further study using Hsieh's footprint model (Hsieh et al., 2000) combined with geographic information system (GIS) showed most of the flux sources were within the range of 250 m and monsoon and periodic winds existed clearly. The tower-based NEE could be mis-explained because the daytime and nighttime flux sources actually came from different plantations/species. The tower-based Re (ecosystem respiration) was over-estimated about 0.56 umol m-2s-1. The annual mean NEE in plot no.10 and no.11 was -3.12, -0.87, -1.58, -3.09 Mg C ha-1yr-1 for 2009 to 2012, respectively after a simple revision.