| Texto completo | |
| Autor(es): |
Sato, Hiromitsu
;
Cowling, Sharon Anne
Número total de Autores: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | QUATERNARY SCIENCE REVIEWS; v. 171, p. 38-47, SEP 1 2017. |
| Citações Web of Science: | 3 |
| Resumo | |
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) | |
| Processo FAPESP: | 12/50260-6 - Estruturacao e evolucao da biota amazonica e seu ambiente:uma abordagem integrativa. (fapesp-biota-nsf dimensions) |
| Beneficiário: | Lúcia Garcez Lohmann |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa BIOTA - Temático |