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dc.contributor.authorFu, Zheng
dc.contributor.authorGerken, Tobias
dc.contributor.authorBromley, Gabriel T.
dc.contributor.authorAraújo, Alessandro
dc.contributor.authorBonal, Damien
dc.contributor.authorBurban, Benoit
dc.contributor.authorFicklin, Darren L.
dc.contributor.authorFuentes, Jose D.
dc.contributor.authorGoulden, Michael L.
dc.contributor.authorHirano, Takashi
dc.contributor.authorKosugi, Yoshiko
dc.contributor.authorLiddell, Michael
dc.contributor.authorNicolini, Giacomo
dc.contributor.authorNiu, Shuli
dc.contributor.authorRoupsard, Olivier
dc.contributor.authorStefani, Paolo
dc.contributor.authorMi, Chunrong
dc.contributor.authorTofte, Zaddy
dc.contributor.authorXiao, Jingfeng
dc.contributor.authorValentini, Riccardo
dc.contributor.authorWolf, Sebastian
dc.contributor.authorStoy, Paul C.
dc.identifier.citationFu, Zheng, Tobias Gerken, Gabriel Bromley, Alessandro Araújo, Damien Bonal, Benoit Burban, Darren Ficklin, Jose D. Fuentes, Michael Goulden, Takashi Hirano, Yoshiko Kosugi, Michael Liddell, Giacomo Nicolini, Shuli Niu, Olivier Roupsard, Paolo Stefani, Chunrong Mi, Zaddy Tofte, Jingfeng Xiao, Riccardo Valentini, Sebastian Wolf, and Paul C. Stoy. "The surface-atmosphere exchange of carbon dioxide in tropical rainforests: Sensitivity to environmental drivers and flux measurement methodology." Agricultural and Forest Meteorology 263 (December 2018): 292-307. DOI:10.1016/j.agrformet.2018.09.001.en_US
dc.description.abstractTropical rainforests play a central role in the Earth system by regulating climate, maintaining biodiversity, and sequestering carbon. They are under threat by direct anthropogenic impacts like deforestation and the indirect anthropogenic impacts of climate change. A synthesis of the factors that determine the net ecosystem exchange of carbon dioxide (NEE) at the site scale across different forests in the tropical rainforest biome has not been undertaken to date. Here, we study NEE and its components, gross ecosystem productivity (GEP) and ecosystem respiration (RE), across thirteen natural and managed forests within the tropical rainforest biome with 63 total site-years of eddy covariance data. Our results reveal that the five ecosystems with the largest annual gross carbon uptake by photosynthesis (i.e. GEP > 3000 g C m(-2) y(-1)) have the lowest net carbon uptake - or even carbon losses versus other study ecosystems because RE is of a similar magnitude. Sites that provided sub canopy CO2 storage observations had higher average magnitudes of GEP and RE and lower average magnitudes of NEE, highlighting the importance of measurement methodology for understanding carbon dynamics in ecosystems with characteristically tall and dense vegetation. A path analysis revealed that vapor pressure deficit (VPD) played a greater role than soil moisture or air temperature in constraining GEP under light saturated conditions across most study sites, but to differing degrees from -0.31 to -0.87 mu mol CO2 m(-2) s(-1) hPa(-1). Climate projections from 13 general circulation models (CMIP5) under the representative concentration pathway that generates 8.5 W m(-2) of radiative forcing suggest that many current tropical rainforest sites on the lower end of the current temperature range are likely to reach a climate space similar to present-day warmer sites by the year 2050, warmer sites will reach a climate not currently experienced, and all forests are likely to experience higher VPD. Results demonstrate the need to quantify if and how mature tropical trees acclimate to heat and water stress, and to further develop flux-partitioning and gap-filling algorithms for defensible estimates of carbon exchange in tropical rainforests.en_US
dc.description.sponsorshipU.S. Department of Energy GoAmazon Grant SC0011097; U.S. National Science Foundation grants 1552976, 1702029; Graduate School MSU; National Natural Science Foundation of China 31625006; China Scholarship Council; North-South Centre of ETH Zurichen_US
dc.rightsThis Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).en_US
dc.titleThe surface-atmosphere exchange of carbon dioxide in tropical rainforests: Sensitivity to environmental drivers and flux measurement methodologyen_US
mus.citation.journaltitleAgricultural and Forest Meteorologyen_US
mus.identifier.categoryLife Sciences & Earth Sciencesen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentLand Resources & Environmental Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.contributor.orcidBromley, Gabriel T.|0000-0002-4497-1058en_US
mus.contributor.orcidGerken, Tobias|0000-0001-5617-186Xen_US

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