文章基本信息

标题：Growth and hydraulic (not mechanical) constraints govern the scaling of tree height and mass
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作者：Karl J. Niklas ; Hanns-Christof Spatz
期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：2004
卷号：101
期号：44
页码：15661-15663
DOI：10.1073/pnas.0405857101
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The size-dependent variations of plant height L and mass M with respect to basal stem diameter D are important to the analysis of a broad range of ecological and evolutionary phenomena. Prior examination of some of the world's largest trees suggests that the scaling relationships L {alpha} D2/3 and M {alpha} D8/3 hold true, ostensibly as functional adaptations for mechanical stability. This concept remains engrained in the literature in the form of null hypotheses (or predictive models), despite numerous examples showing that the 2/3 and 8/3 rules are violated by small and intermediate-sized plants. Here, we present a growth-hydraulic model that provides more accurate and biologically realistic predictions of L and M. This model also sheds light on why L, D, and M scale differently across species and habitats as a result of differences in absolute size.