Univ. of Arizona, Tucson, AZ (United States). Dept. of Ecology and Evolutionary Biology; Brown Univ., Providence, RI (United States). Inst. at Brown for Environment and Society
Univ. of Arizona, Tucson, AZ (United States). Dept. of Ecology and Evolutionary Biology; Brookhaven National Lab. (BNL), Upton, NY (United States). Environmental and Climate Sciences Dept.
Univ. of Arizona, Tucson, AZ (United States). Dept. of Ecology and Evolutionary Biology
Univ. of Sao Paulo (Brazil). Center for Nuclear Energy in Agriculture (CENA)
Univ. of California, Irvine, CA (United States). Ecology and Evolutionary Biology and Center for Environmental Biology
Federal Univ. of Western Para, Santarem (Brazil). Inst. for Biodiversity and Forest (UFOPA)
Univ. of Michigan, Ann Arbor, MI (United States). Dept. of Civil and Environmental Engineering
Univ. of Campinas (UNICAMP), Sao Paulo (Brazil). Dept. of Plant Biology
National Inst. of Amazonian Research (INPA), Manaus (Brazil). Tropical Forest Sciences
Univ. of Arizona, Tucson, AZ (United States). Dept. of Ecology and Evolutionary Biology; Michigan State Univ., East Lansing, MI (United States). Dept. of Forestry
Brazilian Agricultural Research Corp. (EMBRAPA), Herbarium of Embrapa Amazônia Oriental (IAN), Santarem (Brazil)
Univ. of Technology, Sydney (Australia). Plant Functional Biology and Climate Change Cluster
Federal Univ. of Western Para, Santarem (Brazil). Inst. for Biodiversity and Forest (UFOPA). Atmospheric Sciences Dept. and Inst. of Engineering and Geosciences
Michigan State Univ., East Lansing, MI (United States). Dept. of Forestry
Federal Univ. of Western Para, Santarem (Brazil). Inst. for Biodiversity and Forest (UFOPA). Society, Nature and Development Dept.
Satellite and tower-based metrics of forest-scale photosynthesis generally increase with dry season progression across central Amazônia, but the underlying mechanisms lack consensus. We conducted demographic surveys of leaf age composition, and measured age-dependence of leaf physiology in broadleaf canopy trees of abundant species at a central eastern Amazon site. Using a novel leaf-to-branch scaling approach, we used this data to independently test the much-debated hypothesis—arising from satellite and tower-based observations—that leaf phenology could explain the forest-scale pattern of dry season photosynthesis. Stomatal conductance and biochemical parameters of photosynthesis were higher for recently mature leaves than for old leaves. Most branches had multiple leaf age categories simultaneously present, and the number of recently mature leaves increased as the dry season progressed because old leaves were exchanged for new leaves. These findings provide the first direct field evidence that branch-scale photosynthetic capacity increases during the dry season, with a magnitude consistent with increases in ecosystem-scale photosynthetic capacity derived from flux towers. In conclusion, interaction between leaf age-dependent physiology and shifting leaf age-demographic composition are sufficient to explain the dry season photosynthetic capacity pattern at this site, and should be considered in vegetation models of tropical evergreen forests.
Albert, Loren P., et al. "Age-dependent leaf physiology and consequences for crown-scale carbon uptake during the dry season in an Amazon evergreen forest." New Phytologist, vol. 218, no. 1, Mar. 2018. https://doi.org/10.1111/nph.15056
Albert, Loren P., Wu, Jin, Prohaska, Neill, de Camargo, Plinio Barbosa, Huxman, Travis E., Tribuzy, Edgard S., Ivanov, Valeriy Y., Oliveira, Rafael S., Garcia, Sabrina, Smith, Marielle N., Oliveira Junior, Raimundo Cosme, Restrepo-Coupe, Natalia, da Silva, Rodrigo, Stark, Scott C., Martins, Giordane A., Penha, Deliane V., & Saleska, Scott R. (2018). Age-dependent leaf physiology and consequences for crown-scale carbon uptake during the dry season in an Amazon evergreen forest. New Phytologist, 218(1). https://doi.org/10.1111/nph.15056
Albert, Loren P., Wu, Jin, Prohaska, Neill, et al., "Age-dependent leaf physiology and consequences for crown-scale carbon uptake during the dry season in an Amazon evergreen forest," New Phytologist 218, no. 1 (2018), https://doi.org/10.1111/nph.15056
@article{osti_1424982,
author = {Albert, Loren P. and Wu, Jin and Prohaska, Neill and de Camargo, Plinio Barbosa and Huxman, Travis E. and Tribuzy, Edgard S. and Ivanov, Valeriy Y. and Oliveira, Rafael S. and Garcia, Sabrina and Smith, Marielle N. and others},
title = {Age-dependent leaf physiology and consequences for crown-scale carbon uptake during the dry season in an Amazon evergreen forest},
annote = {Satellite and tower-based metrics of forest-scale photosynthesis generally increase with dry season progression across central Amazônia, but the underlying mechanisms lack consensus. We conducted demographic surveys of leaf age composition, and measured age-dependence of leaf physiology in broadleaf canopy trees of abundant species at a central eastern Amazon site. Using a novel leaf-to-branch scaling approach, we used this data to independently test the much-debated hypothesis—arising from satellite and tower-based observations—that leaf phenology could explain the forest-scale pattern of dry season photosynthesis. Stomatal conductance and biochemical parameters of photosynthesis were higher for recently mature leaves than for old leaves. Most branches had multiple leaf age categories simultaneously present, and the number of recently mature leaves increased as the dry season progressed because old leaves were exchanged for new leaves. These findings provide the first direct field evidence that branch-scale photosynthetic capacity increases during the dry season, with a magnitude consistent with increases in ecosystem-scale photosynthetic capacity derived from flux towers. In conclusion, interaction between leaf age-dependent physiology and shifting leaf age-demographic composition are sufficient to explain the dry season photosynthetic capacity pattern at this site, and should be considered in vegetation models of tropical evergreen forests.},
doi = {10.1111/nph.15056},
url = {https://www.osti.gov/biblio/1424982},
journal = {New Phytologist},
issn = {ISSN 0028-646X},
number = {1},
volume = {218},
place = {United States},
publisher = {Wiley},
year = {2018},
month = {03}}
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); National Science Foundation (NSF); Univ. of Arizona, Tucson, AZ (United States); Brazilian Agricultural Research Corp. (EMBRAPA); Large Scale Biosphere-Atmosphere Program in the Amazon (LBA); Herbarium of Embrapa Amazônia Oriental (IAN)
Grant/Contract Number:
SC0012704; SC0008383
OSTI ID:
1424982
Alternate ID(s):
OSTI ID: 1423698
Report Number(s):
BNL-203201-2018-JAAM
Journal Information:
New Phytologist, Journal Name: New Phytologist Journal Issue: 1 Vol. 218; ISSN 0028-646X