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Increasing biomass in Amazonian forest plots.

Timothy R Baker1, Oliver L Phillips, Yadvinder Malhi

  • 1Max-Planck-Institut für Biogeochemie, Postfach 10 01 64, D-07701 Jena, Germany. t.baker@geog.leeds.ac.uk

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|June 24, 2004
PubMed
Summary
This summary is machine-generated.

Amazonian old-growth forests show a significant increase in above-ground biomass (AGB), indicating a regional carbon sink. This updated analysis confirms forest carbon sequestration despite previous methodological debates.

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Area of Science:

  • Ecology
  • Forestry
  • Climate Science

Background:

  • Previous studies on Amazonian forest biomass changes inferred a regional carbon sink.
  • Methodological and sampling issues in prior research sparked debate.

Purpose of the Study:

  • To re-evaluate biomass change in old-growth Amazonian forests using updated data.
  • To address uncertainties and debates surrounding previous findings.

Main Methods:

  • Analysis of updated inventory data from 59 old-growth Amazonian forest plots.
  • Calculation of above-ground dry biomass (AGB) changes in trees >10 cm diameter.
  • Robustness checks against variations in wood specific gravity, allometric equations, and diameter measurement uncertainties.

Main Results:

  • A consistent increase in AGB of 1.22 +/- 0.43 Mg ha(-1) yr(-1) was observed across plots.
  • Weighted analysis yielded a similar increase of 0.98 +/- 0.38 Mg ha(-1) yr(-1).
  • Findings remained significant even with conservative assumptions for uncertain tree measurements.

Conclusions:

  • The study confirms a significant increase in above-ground biomass in old-growth Amazonian forests.
  • Results suggest a regional carbon sink in these forests over the past two decades.
  • The rate of net stand-level change is consistent with increased forest growth and turnover.