Drought stress and tree size determine stem CO2 efflux in a tropical forest

Bibliographische Detailangaben
Veröffentlicht in:	The New phytologist. - 1979. - 218(2018), 4 vom: 03. Juni, Seite 1393-1405
1. Verfasser:	Rowland, Lucy (VerfasserIn)
Weitere Verfasser:	da Costa, Antonio C L, Oliveira, Alex A R, Oliveira, Rafael S, Bittencourt, Paulo L, Costa, Patricia B, Giles, Andre L, Sosa, Azul I, Coughlin, Ingrid, Godlee, John L, Vasconcelos, Steel S, Junior, João A S, Ferreira, Leandro V, Mencuccini, Maurizio, Meir, Patrick
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2018
Zugriff auf das übergeordnete Werk:	The New phytologist
Schlagworte:	Journal Article Research Support, Non-U.S. Gov't drought growth respiration maintenance respiration stem CO2 efflux tropical rainforests woody tissue respiration Carbon Dioxide 142M471B3J

Beschreibung
Zusammenfassung:	© 2018 The Authors New Phytologist © 2018 New Phytologist Trust. CO2 efflux from stems (CO2_stem ) accounts for a substantial fraction of tropical forest gross primary productivity, but the climate sensitivity of this flux remains poorly understood. We present a study of tropical forest CO2_stem from 215 trees across wet and dry seasons, at the world's longest running tropical forest drought experiment site. We show a 27% increase in wet season CO2_stem in the droughted forest relative to a control forest. This was driven by increasing CO2_stem in trees 10-40 cm diameter. Furthermore, we show that drought increases the proportion of maintenance to growth respiration in trees > 20 cm diameter, including large increases in maintenance respiration in the largest droughted trees, > 40 cm diameter. However, we found no clear taxonomic influence on CO2_stem and were unable to accurately predict how drought sensitivity altered ecosystem scale CO2_stem , due to substantial uncertainty introduced by contrasting methods previously employed to scale CO2_stem fluxes. Our findings indicate that under future scenarios of elevated drought, increases in CO2_stem may augment carbon losses, weakening or potentially reversing the tropical forest carbon sink. However, due to substantial uncertainties in scaling CO2_stem fluxes, stand-scale future estimates of changes in stem CO2 emissions remain highly uncertain
Beschreibung:	Date Completed 01.10.2019 Date Revised 30.09.2020 published: Print-Electronic Citation Status MEDLINE
ISSN:	1469-8137
DOI:	10.1111/nph.15024