Carbon dynamics and Landscape-scale vegetation patterns in an old-growth Amazonian rainforest
Gregory
W.
Santoni, Harvard University, santoni@fas.harvard.edu
(Presenting)
Lucy
Hutyra, Harvard University, lhutyra@fas.harvard.edu
Simone
Aparecida
Vieira, USB,CENA, savieira@cena.usp.br
V.Y.
Chow, Harvard University, vchow@fas.harvard.edu
Raimundo
Sousa
Lima Jr., UFP, junior@lbaeco.com.br
Dulcyana
F.
Marques, FIT, dulcyana@hotmail.com
Kadson
Oliveira
Silva, UFP, kadson@lbaeco.com.br
Elizabeth
Hammond-Pyle, Harvard University, pyle@fas.harvard.edu
Scott
R.
Saleska, Harvard University, saleska@fas.harvard.edu
(Presenting)
Plínio
Barbosa de
Camargo, USP,CENA, pcamargo@cena.usp.br
Steven
C.
Wofsy, Harvard University, scw@io.harvard.edu
Here we present preliminary results from spatially-distributed ground-based measurements of vegetation structure to assess (1) variability of landscape-scale disturbance patterns (including distributions of woody material across live and dead pools) and (2) representativeness of eddy flux measurement sites in context of the broader landscape.
Previous work (Rice et al. 2004) in a well-drained old-growth upland forest (near the km 67 access road of the Tapajós National Forest near Santarém, Pará, Brazil) in the footprint of an eddy covariance tower showed significantly elevated coarse woody debris (CWD) stocks and small-tree recruitment rates, both indicators of recent disturbance. To assess variability of such indicators of disturbance at the landscape-scale, we established four new 10 hectare transects near km-72 and km-117 access roads in the Tapajós forest.
The five sites (km 67 and the four new sites) have similar biomass but appear to have different disturbance histories. Three of five sites, including km 67, show signs of recent disturbance expressed by the presence of more recently downed wood. This work shows that disturbance states are variable at the landscape scale, and further supports the hypothesis that the km 67 site is currently recovering from disturbances in the recent past.
Submetido por Gregory Winn Santoni em 25-MAR-2004
Tema Científico do LBA: CD (Armazenamento e Trocas de Carbono)