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A general method for calculating the optimal leaf longevity from the viewpoint of carbon economy

Seki_Yoshida_Takada_2015JMB.pdf898.57 kBPDF見る/開く

タイトル: A general method for calculating the optimal leaf longevity from the viewpoint of carbon economy
著者: Seki, Motohide 著作を一覧する
Yoshida, Tomohiko 著作を一覧する
Takada, Takenori 著作を一覧する
キーワード: Leaf lifespan
Optimal strategy
Multiple flushing
発行日: 2015年 9月
出版者: Springer
誌名: Journal of mathematical biology
巻: 71
号: 3
開始ページ: 669
終了ページ: 690
出版社 DOI: 10.1007/s00285-014-0830-7
抄録: According to the viewpoint of the optimal strategy theory, a tree is expected to shed its leaves when they no longer contribute to maximisation of net carbon gain. Several theoretical models have been proposed in which a tree was assumed to strategically shed an old deteriorated leaf to develop a new leaf. We mathematically refined an index used in a previous theoretical model [Kikuzawa (Am Nat 138:1250-1263, 1991)] so that the index is exactly proportional to a tree's lifelong net carbon gain. We also incorporated a tree's strategy that determines the timing of leaf expansion, and examined three kinds of strategies. Specifically, we assumed that a new leaf is expanded (1) immediately after shedding of an old leaf, (2) only at the beginning of spring, or (3) immediately after shedding of an old leaf if the shedding occurs during a non-winter season and at the beginning of spring otherwise. We derived a measure of optimal leaf longevity maximising the value of an appropriate index reflecting total net carbon gain and show that use of this index yielded results that are qualitatively consistent with empirical records. The model predicted that expanding a new leaf at the beginning of spring than immediately after shedding usually yields higher carbon gain, and combined strategy of the immediate replacement and the spring flushing earned the highest gain. In addition, our numerical analyses suggested that multiple flushing seen in a few species of subtropical zones can be explained in terms of carbon economy.
Rights: The final publication is available at Springer via
資料タイプ: article (author version)
出現コレクション:雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

提供者: 高田 壮則


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