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Title: Impact of insect defoliation on forest carbon balance as assessed with a canopy assimilation model
Author: Schafer, Karina V.; Clark, Kenneth L.; Skowronski, Nicholas; Hamerklynck, Erik P.;
Source: Global Change Biology. 16: 546-560.
Publication Series: Scientific Journal (JRNL)
Disturbances such as fire, hurricanes, and herbivory often result in the net release of CO2 from forests to the atmosphere, but the magnitude of carbon (C) loss is poorly quantified and difficult to predict. Here, we investigate the carbon balance of an oak/pine forest in the New Jersey Pine Barrens using the Canopy Conductance Constrained Carbon Assimilation (4C-A) model. The 4C-A model utilizes whole-tree sap-flux and leaf-level photosynthetic gas exchange measurements at distinct canopy levels to estimate canopy assimilation. After model parameterization, sensitivity analyses, and evaluation against eddy flux measurements made in 2006, the model was used to predict C assimilation for an undisturbed year in 2005, and in 2007 when the stand was completely defoliated for 2-3 weeks during an infestation of gypsy moths (Lymantria dispar L.).
Keywords: 4C-A, canopy assimilation, defoliation, New Jersey Pine Barrens, sap flux
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Schafer, Karina V.; Clark, Kenneth L.; Skowronski, Nicholas; Hamerklynck, Erik P. 2010. Impact of insect defoliation on forest carbon balance as assessed with a canopy assimilation model. Global Change Biology. 16: 546-560.
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