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Title: Overwintering evergreen oaks reverse typical relationships between leaf traits in a species spectrum
Authors: Harayama, Hisanori
Ishida, Atsushi  kyouindb  KAKEN_id
Yoshimura, Jin
Author's alias: 石田, 厚
Keywords: leaf economics spectrum
leaf nitrogen
winter cold
Issue Date: Jul-2016
Publisher: The Royal Society
Journal title: Royal Society Open Science
Volume: 3
Thesis number: 160276
Abstract: The leaf economics spectrum has given us a fundamental understanding of the species variations in leaf variables. Across plant species, tight correlations among leaf mass per area (LMA), mass-based nitrogen (Nm) and photosynthetic rate (Am) and leaf lifespan have been well known as trade-offs in leaf carbon economy. However, the regional or biome-level correlations may not be necessary to correspond with the global-scale analysis. Here, we show that almost all leaf variables in overwintering evergreen oaks in Japan were relatively well included within the evergreen-broadleaved trees in worldwide temperate forests, but Nm was more consistent with that in deciduous broadleaved trees. Contrary to the universal correlations, the correlation between Am and Nm among the evergreen oaks was negative and the correlation between Am and LMA disappeared. The unique performance was due to specific nitrogen allocation within leaves, i.e. the evergreen oaks with later leaf maturation had lower Nm but higher nitrogen allocation to photosynthetic enzymes within leaves, to enhance carbon gain against the delayed leaf maturation and the shortened photosynthetic period due to cold winters. Our data demonstrate that correlations between leaf variables in a local scale are occasionally different from averaged global-scale datasets, because of the constraints in each biome.
Rights: © 2016 The Authors. Published by the Royal Society under the terms of the Creative Commons Attribution License, which permits unrestricted use, provided the original author and source are credited.
DOI(Published Version): 10.1098/rsos.160276
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