Dec 17, 2011

Consequences of resource limitation for recovery from repeated defoliation in Eucalyptus globulus Labilladière

Tree Physiology
Karen M BarryElizabeth A Pinkard

Abstract

Recovery following defoliation can be modified by co-occurring site resource limitations. The growth response of young Eucalyptus globulus saplings to two defoliation events was examined in an experimental plantation with combinations of low (-) or high (+) water (W) and nitrogen (N) resources. Artificial defoliation was applied at 3 and 9 months of age to remove ~40 and 55% of leaf area in the upper crown, respectively. At 18 months of age, height, stem diameter and leaf area were not significantly different between control and defoliated saplings, across all resource treatments. However, stem volume, bark volume and branch number were significantly increased in defoliated saplings, including a significant interaction with resource treatment. Total above-ground biomass of saplings in response to defoliation was significantly higher (almost double) than controls for the low water (N + W-) treatment only. Significantly increased foliar starch content (and a trend for increased soluble sugars) in the upper crown zone was found in the defoliated saplings of the N + W- treatment compared with the upper zone of control saplings. Foliar total non-structural carbohydrates were significantly correlated to stem biomass regardless of res...Continue Reading

Mentioned in this Paper

Congenital Structural Myopathy
Carbohydrate nutrients
Vitreous Carbon
Eucalyptus
Stem of plant
Soluble
ADRBK1 wt Allele
Nitrogen
Starch
Euzetes globulus

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