Partitioning controls on Amazon forest photosynthesis between environmental and biotic factors at hourly to interannual timescales

Wu, Jin; Guan, Kaiyu; Hayek, Matthew; Restrepo-Coupe, Natalia; Wiedemann, Kenia T.; Xu, Xiangtao; Wehr, Richard; Christoffersen, Bradley O.; Miao, Guofang; da Silva, Rodrigo; de Araujo, Alessandro C.; Oliviera, Raimundo C.; Camargo, Plinio B.; Monson, Russell K.; Huete, Alfredo R.; Saleska, Scott R.

doi:10.1111/gcb.13509

Title: Partitioning controls on Amazon forest photosynthesis between environmental and biotic factors at hourly to interannual timescales

Journal Article · Mon Sep 19 00:00:00 EDT 2016 · Global Change Biology

DOI:https://doi.org/10.1111/gcb.13509· OSTI ID:1351750

Wu, Jin ^[1]; Guan, Kaiyu ^[2]; Hayek, Matthew ^[3];

^[4]; Wiedemann, Kenia T. ^[5]; Xu, Xiangtao ^[6]; Wehr, Richard ^[7]; Christoffersen, Bradley O. ^[8]; Miao, Guofang ^[9]; da Silva, Rodrigo ^[10]; de Araujo, Alessandro C. ^[11]; Oliviera, Raimundo C. ^[12]; Camargo, Plinio B. ^[13]; Monson, Russell K. ^[7]; Huete, Alfredo R. ^[14]; Saleska, Scott R. ^[7]

Univ. of Arizona, Tucson, AZ (United States); Brookhaven National Lab. (BNL), Upton, NY (United States)
Univ. of Illinois at Urbana Champaign, Urbana, IL (United States)
Harvard Univ., Cambridge, MA (United States)
Univ. of Arizona, Tucson, AZ (United States); Univ. of Technology Sydney, Sydney, NSW (Australia)
Univ. of Arizona, Tucson, AZ (United States); Harvard Univ., Cambridge, MA (United States)
Princeton Univ., Princeton, NJ (United States)
Univ. of Arizona, Tucson, AZ (United States)
Univ. of Arizona, Tucson, AZ (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Illinois at Urbana Champaign, Urbana, IL (United States); North Carolina State Univ., Raleigh, NC (United States)
Univ. of Western Para-UFOPA, Para (Brazil)
Embrapa Amazonia Oriental, Belem (Brasil)
Embrapa Amazonia Oriental, Santarem (Brasil)
Univ. de Sao Paulo, Piracicaba (Brasil)
Univ. of Technology Sydney, Sydney, NSW (Australia)

Abstract Gross ecosystem productivity ( GEP ) in tropical forests varies both with the environment and with biotic changes in photosynthetic infrastructure, but our understanding of the relative effects of these factors across timescales is limited. Here, we used a statistical model to partition the variability of seven years of eddy covariance‐derived GEP in a central Amazon evergreen forest into two main causes: variation in environmental drivers (solar radiation, diffuse light fraction, and vapor pressure deficit) that interact with model parameters that govern photosynthesis and biotic variation in canopy photosynthetic light‐use efficiency associated with changes in the parameters themselves. Our fitted model was able to explain most of the variability in GEP at hourly ( R ² = 0.77) to interannual ( R ² = 0.80) timescales. At hourly timescales, we found that 75% of observed GEP variability could be attributed to environmental variability. When aggregating GEP to the longer timescales (daily, monthly, and yearly), however, environmental variation explained progressively less GEP variability: At monthly timescales, it explained only 3%, much less than biotic variation in canopy photosynthetic light‐use efficiency, which accounted for 63%. These results challenge modeling approaches that assume GEP is primarily controlled by the environment at both short and long timescales. Our approach distinguishing biotic from environmental variability can help to resolve debates about environmental limitations to tropical forest photosynthesis. For example, we found that biotically regulated canopy photosynthetic light‐use efficiency (associated with leaf phenology) increased with sunlight during dry seasons (consistent with light but not water limitation of canopy development) but that realized GEP was nonetheless lower relative to its potential efficiency during dry than wet seasons (consistent with water limitation of photosynthesis in given assemblages of leaves). This work highlights the importance of accounting for differential regulation of GEP at different timescales and of identifying the underlying feedbacks and adaptive mechanisms.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC00112704; DE‐SC0008383

OSTI ID:: 1351750

Alternate ID(s):: OSTI ID: 1401016

Report Number(s):: BNL-113771-2017-JA; R&D Project: 21087; YN0100000

Journal Information:: Global Change Biology, Vol. 23, Issue 3; ISSN 1354-1013

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 86 works

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The capacity to emit isoprene differentiates the photosynthetic temperature responses of tropical plant species Taylor, Tyeen C.; Smith, Marielle N.; Slot, Martijn Plant, Cell & Environment, Vol. 42, Issue 8 https://doi.org/10.1111/pce.13564	journal	June 2019
Species-Specific Shifts in Diurnal Sap Velocity Dynamics and Hysteretic Behavior of Ecophysiological Variables During the 2015–2016 El Niño Event in the Amazon Forest Gimenez, Bruno O.; Jardine, Kolby J.; Higuchi, Niro Frontiers in Plant Science, Vol. 10 https://doi.org/10.3389/fpls.2019.00830	journal	June 2019
Carbon exchange in an Amazon forest: from hours to years Hayek, Matthew N.; Longo, Marcos; Wu, Jin Biogeosciences, Vol. 15, Issue 15 https://doi.org/10.5194/bg-15-4833-2018	journal	January 2018
Hydrological niche segregation defines forest structure and drought tolerance strategies in a seasonal Amazon forest Brum, Mauro; Vadeboncoeur, Matthew A.; Ivanov, Valeriy Journal of Ecology, Vol. 107, Issue 1 https://doi.org/10.1111/1365-2745.13022	journal	July 2018
The importance of physiological, structural and trait responses to drought stress in driving spatial and temporal variation in GPP across Amazon forests Flack-Prain, Sophie; Meir, Patrick; Malhi, Yadvinder Biogeosciences, Vol. 16, Issue 22 https://doi.org/10.5194/bg-16-4463-2019	journal	January 2019
In situ temperature relationships of biochemical and stomatal controls of photosynthesis in four lowland tropical tree species Slot, Martijn; Winter, Klaus Plant, Cell & Environment, Vol. 40, Issue 12 https://doi.org/10.1111/pce.13071	journal	October 2017
Age-dependent leaf physiology and consequences for crown-scale carbon uptake during the dry season in an Amazon evergreen forest Albert, Loren P.; Wu, Jin; Prohaska, Neill New Phytologist, Vol. 219, Issue 3 https://doi.org/10.1111/nph.15056	journal	March 2018
Improving predictions of tropical forest response to climate change through integration of field studies and ecosystem modeling Feng, Xiaohui; Uriarte, María; González, Grizelle Global Change Biology, Vol. 24, Issue 1 https://doi.org/10.1111/gcb.13863	journal	September 2017
Effects of Forest Canopy Vertical Stratification on the Estimation of Gross Primary Production by Remote Sensing Lin, Shangrong; Li, Jing; Liu, Qinhuo Remote Sensing, Vol. 10, Issue 9 https://doi.org/10.3390/rs10091329	journal	August 2018
Air temperature optima of vegetation productivity across global biomes Huang, Mengtian; Piao, Shilong; Ciais, Philippe Nature Ecology & Evolution, Vol. 3, Issue 5 https://doi.org/10.1038/s41559-019-0838-x	journal	March 2019

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