Glacial Amazonia at the canopy-scale: Using a biophysical model to understand forest robustness

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Author(s):	Sato, Hiromitsu ; Cowling, Sharon Anne Total Authors: 2
Document type:	Journal article
Source:	QUATERNARY SCIENCE REVIEWS; v. 171, p. 38-47, SEP 1 2017.
Web of Science Citations:	3
Abstract
A canopy-scale model (CANOAK) was used to simulate lowland Amazonia during the Last Glacial Maximum. Modeled values of Net Ecosystem Exchange driven by glacial environmental conditions were roughly half the magnitude of modern fluxes. Factorial experiments reveal lowered {[}CO2] to be the primary cause of reduced carbon fluxes while lowered air temperatures enhance net carbon uptake. LGM temperatures are suggested to be closer to optimal for carbon uptake than modern temperatures, explained through the canopy energy balance. Further analysis of the canopy energy balance and resultant leaf temperature regime provide viable mechanisms to explain enhanced carbon-water relations at lowered temperatures and forest robustness over glaciations. An ecophysiological phenomena known as the `cross-over' point, wherein leaf temperatures sink below air temperature, was reproduced and found to demarcate critical changes in energy balance partitioning. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process:	12/50260-6 - Structure and evolution of the Amazonian biota and its environment: an integrative approach
Grantee:	Lúcia Garcez Lohmann
Support Opportunities:	BIOTA-FAPESP Program - Thematic Grants