Dynamics of carbon, biomass, and structure in two Amazonian forests

Pyle, Elizabeth Hammond, Santoni, Gregory W., Nascimento, Henrique E.M., Hutyra, Lucy R., Vieira, Simone, Curran, Daniel J., van Haren, Joost, Saleska, Scott R., Chow, V.Y., Carmago, Plinio B., Laurance, William F., and Wofsy, Steven C. (2008) Dynamics of carbon, biomass, and structure in two Amazonian forests. Journal of Geophysical Research: Biogeosciences, 113 (G1). G00B08. pp. 1-20.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website: http://dx.doi.org/10.1029/2007JG000592
 
55
4


Abstract

[1] Amazon forests are potentially globally significant sources or sinks for atmospheric carbon dioxide. In this study, we characterize the spatial trends in carbon storage and fluxes in both live and dead biomass (necromass) in two Amazonian forests, the Biological Dynamic of Forest Fragments Project (BDFFP), near Manaus, Amazonas, and the Tapajós National Forest (TNF) near Santarém, Pará. We assessed coarse woody debris (CWD) stocks, tree growth, mortality, and recruitment in ground-based plots distributed across the terra firme forest at both sites. Carbon dynamics were similar within each site, but differed significantly between the sites. The BDFFP and the TNF held comparable live biomass (167 ± 7.6 MgC·ha−1 versus 149 ± 6.0 MgC·ha−1, respectively), but stocks of CWD were 2.5 times larger at TNF (16.2 ± 1.5 MgC·ha−1 at BDFFP, versus 40.1 ± 3.9 MgC·ha−1 at TNF). A model of current forest dynamics suggests that the BDFFP was close to carbon balance, and its size class structure approximated a steady state. The TNF, by contrast, showed rapid carbon accrual to live biomass (3.24 ± 0.22 MgC·ha−1·a−1 in TNF, 2.59 ± 0.16 MgC·ha−1·a−1 in BDFFP), which was more than offset by losses from large stocks of CWD, as well as ongoing shifts of biomass among size classes. This pattern in the TNF suggests recovery from a significant disturbance. The net loss of carbon from the TNF will likely last 10–15 years after the initial disturbance (controlled by the rate of decay of coarse woody debris), followed by uptake of carbon as the forest size class structure and composition continue to shift. The frequency and longevity of forests showing such disequilibruim dynamics within the larger matrix of the Amazon remains an essential question to understanding Amazonian carbon balance.

Item ID: 27559
Item Type: Article (Research - C1)
ISSN: 2169-8961
Additional Information:

This is the publication 510 in the BDFFP technical series.

Funders: NASA grants to Harvard University, Harvard University Center for the Environment, Harvard College Research Fund, Harvard University’s David Rockefeller Center for Latin American Studies
Projects and Grants: NASA grants (NCC5 – 341, NCC5 – 684, and NNG06GG69A)
Date Deposited: 07 Jun 2013 09:12
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050202 Conservation and Biodiversity @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960899 Flora, Fauna and Biodiversity of Environments not elsewhere classified @ 100%
Downloads: Total: 4
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page