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Resource Allocation in Trees and Ecosystems
Pages 127-132

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From page 127...
... INTRODUCTION ratio of Other various a tree's The allocation of carbon into various components of trees and ecosystems changes depending on the environment (Waring 1983~. Trees on an exposed headland exhibit extreme stem taper and an extensive supporting root system.
From page 128...
... This "growth efficiency" ratio decreases abruptly when the environment becomes less favorable and more slowly as trees age and the cost of maintenance respiration increases (Fig.
From page 129...
... PHLOEM/SAPWOOD AREA If the transport of photosynthate through phloem is inhibited, then the cross-sectional area of sieve cells should be reduced in relation to leaf area or the surrogate, sapwood cross-sectional area. Scots pine trees provided with optimum water and nutrients exhibit a ratio of phloem/sapwood area in the stem, half that of unfertilized and unirrigated trees (Dr.
From page 130...
... BARK BEETLE ATTACKS/ GROWTH EFFICIENCY In many forests, bark beetle attacks follows a reduction in tree vigor. Christiansen et al.
From page 131...
... Growth efficiency provides an index to the density of bark beetle attack required to kill lodgepole pine trees. Filled or partly filled circles represent the proportion of conducting tissue killed on attacked trees.
From page 132...
... Changes in carbon allocation patterns in spruce and pine trees following irrigation and fertilization. Tree Physiol.

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