Authors: Dan Binkley Daniel M Kashian
Publish Date: 2014/11/14
Volume: 18, Issue: 2, Pages: 251-259
Abstract
The growth of forests is the simple sum of the growth rates of all the trees The growth of individual trees results from nonlinear competition among trees for resources including efficiency in the use of resources to grow stems and these characteristics may change as trees and forest age Lodgepole pine Pinus contorta forests in Yellowstone National Park showed an unusual pattern of low dominance of large trees =reverse growth dominance and we hypothesized this pattern resulted from a pattern of declining resource use efficiency defined as wood growth per unit of tree leaf area for large old trees Across a 96site chronosequence the largest trees continued to increase growth with age Leaf area increased faster with tree size than did growth leading to lower growth efficiency for large trees in stands older than about 125 years These patterns contrasted strongly with those from a similar study with fastgrowing Eucalyptus saligna where strongly positive growth dominance resulted from greater growth efficiency across all sizes and ages The hypothesis was supported as the reverse growth dominance was associated with declining resource use efficiency in large old lodgepole pine trees Several factors may contribute to the declining growth efficiency of large old pines and the contribution of these potential factors could be determined from further investigationWe thank the many people who contributed to the broader study of lodgepole pine in Yellowstone National Park especially Bill Romme Monica Turner Dan Tinker Mike Ryan and Creighton Litton Much of that work was funded by the Joint Fire Sciences Program Project Number 031106 with additional support from Colorado State University and Wayne State University Richard Waring Nathan Stephenson Christian Ammer and an anonymous reviewer helped us improve the manuscript substantially
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