Does soil pyrogenic carbon determine plant functional traits in Amazon Basin forests?

Massi, Klecia G., Bird, Michael, Marimon, Beatriz, Marimon, Ben Hur, Nogueira, Denis S., Oliveira, Edmar A., Phillips, Oliver L., Quesada, Carlos A., Andrade, Ana S., Brienen, Roel J.W., Camargo, José L.C., Chave, Jerome, Honorio Coronado, Euridice N., Ferreira, Leandro V., Higuchi, Niro, Laurance, Susan G., Laurance, William F., Lovejoy, Thomas, Malhi, Yadvinder, Martinez, Rodolfo V., Monteagudo, Abel, Neill, David, Prieto, Adriana, Ramírez-angulo, Hirma, Ter Steege, Hans, Vilanova, Emilio, and Feldpausch, Ted R. (2017) Does soil pyrogenic carbon determine plant functional traits in Amazon Basin forests? Plant Ecology, 218 (9). pp. 1047-1062.

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Amazon forests are fire-sensitive ecosystems and consequently fires affect forest structure and composition. For instance, the legacy of past fire regimes may persist through some species and traits that are found due to past fires. In this study, we tested for relationships between functional traits that are classically presented as the main components of plant ecological strategies and environmental filters related to climate and historical fires among permanent mature forest plots across the range of local and regional environmental gradients that occur in Amazonia. We used percentage surface soil pyrogenic carbon (PyC), a recalcitrant form of carbon that can persist for millennia in soils, as a novel indicator of historical fire in old-growth forests. Five out of the nine functional traits evaluated across all 378 species were correlated with some environmental variables. Although there is more PyC in Amazonian soils than previously reported, the percentage soil PyC indicated no detectable legacy effect of past fires on contemporary functional composition. More species with dry diaspores were found in drier and hotter environments. We also found higher wood density in trees from higher temperature sites. If Amazon forest past burnings were local and without distinguishable attributes of a widespread fire regime, then impacts on biodiversity would have been small and heterogeneous. Alternatively, sufficient time may have passed since the last fire to allow for species replacement. Regardless, as we failed to detect any impact of past fire on present forest functional composition, if our plots are representative then it suggests that mature Amazon forests lack a compositional legacy of past fire.

Item ID: 50441
Item Type: Article (Research - C1)
ISSN: 1385-0237
Keywords: fruit type, wood density, fire, soil charcoal, climatological water deficit, temperature, elevation
Funders: Coordination for the Improvement of Higher Education Personnel (CAPES, Brazil), University of Exeter, National Council for Scientific and Technological Development (CNPq—Brazilian government), European Research Council (ERC), Royal Society (RS)
Projects and Grants: CAPES Science without Borders grant (PVE 177/2012), CNPq productivity grant, CNPq Postdoctoral fellowship, CNPq project PELD 403725/2012-7, CNPq project PPBio 457602/2012-0, CNPq Science without Borders grant PVE 401279/2014-6, ERC Advanced Grant, RS Wolfson Research Merit Award
Date Deposited: 20 Sep 2017 09:02
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310302 Community ecology (excl. invasive species ecology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9614 Soils > 961403 Forest and Woodlands Soils @ 50%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960805 Flora, Fauna and Biodiversity at Regional or Larger Scales @ 50%
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