日本地球惑星科学連合2018年大会

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[EE] Eveningポスター発表

セッション記号 A (大気水圏科学) » A-HW 水文・陸水・地下水学・水環境

[A-HW22] 水循環・水環境

2018年5月24日(木) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 7ホール)

コンビーナ:長尾 誠也(金沢大学環日本海域環境研究センター)、町田 功(産業技術総合研究所地質調査総合センター)、飯田 真一(国立研究開発法人森林研究・整備機構森林総合研究所森林研究部門森林防災研究領域水保全研究室、共同)、林 武司(秋田大学教育文化学部)

[AHW22-P09] Difference between the transpiration rates of Moso bamboo (Phyllostachys pubescens) and Japanese cedar (Cryptomeria japonica) forests in a subtropical climate in Taiwan

*Sophie Milena Mariette Lucie Laplace1Hikaru Komatsu2Tomonori Kume3 (1.The Experimental Forest of National Taiwan University 、2.Graduate School of Education, Kyoto University, Japan.、3.Kyushu University, Kasuya Research Forest)

キーワード:Moso Bamboo, Japanese cedar, transpiration, transpiration seasonality

Bamboo forests have been expanding rapidly in Asian countries for the past 50 years. Whether natural or artificial, this expansion involves the replacement of other vegetation types by bamboos, which could impact the local water cycle. Previous studies in Japan have reported that bamboo forests have higher transpiration than coniferous forests under temperate climates, but it is unknown whether this finding applies to subtropical climates. Thus, we examined whether a Moso bamboo (Phyllostachys pubescens) forest would exhibit higher transpiration in a subtropical climate. We used the sap-flux method to estimate the stand transpiration (E) of Moso bamboo and Japanese cedar (Cryptomeria japonica) forests in Taiwan. As was observed in the Japanese studies, annual E for bamboo (478 mm) was higher than that for cedar (122 mm), although we found a difference in the seasonality of E between the Taiwanese and Japanese sites. If this finding is indeed generally applicable, the results of this study and previous studies suggest a significant change in E and, therefore, the terrestrial water cycle when Japanese cedar forests are replaced by bamboo forests. Furthermore, the difference in canopy conductance (Gc) for bamboo was higher than that for cedar in Taiwan, which was reported previously for Japan. This difference in Gc between bamboo and cedar suggests that such replacements will result in considerable changes in the terrestrial carbon cycle.