Growth and hydraulic (not mechanical) constraints govern the scaling of tree height and mass

被引:205
|
作者
Niklas, KJ [1 ]
Spatz, HC
机构
[1] Cornell Univ, Dept Plant Biol, Ithaca, NY 14853 USA
[2] Univ Freiburg, Inst Biol 3, D-79104 Freiburg, Germany
关键词
D O I
10.1073/pnas.0405857101
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
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 proportional to D-2/3 and M proportional to D-8/3 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.
引用
收藏
页码:15661 / 15663
页数:3
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