Spatial Variation of Forest Structure and Aboveground Biomass in Jaru Reserve, Rondonia, Brazil
Sassan
S.
Saatchi, JPL/CALTECH, saatchi@congo.jpl.nasa.gov
Regina
Célia dos Santos
Alvalá, CPTEC/INPE, regina@cptec.inpe.br
(Presenting)
Spatial variation in tropical rain forest structure is an important factor in quantifying the aboveground biomass (AGB) and carbon stock and extrapolating plot measurements to regional or global scales. We analyzed structural data collected in 25 ha area in an intact lowland forest around the flux tower at the Jaru Reserve in Rondonia, Brazil to address the spatial variability in stem density, basal area, canopy roughness, and AGB. The transects were designed prior to the field survery with the help of a one meter resolution IKONOS image over spectrally homogeneous regions away from disturbances. Five permanent 50 m x 1000m transects were installed and Live trees with diameter at breast height (dbh) ≥ 35 cm were collected within the 50 m wide transect with an addition of trees ≥ 5 cm in a narrower transect (5 m x 1000 m) in the middle of wider transects. Among the total of 3626 trees measured on all transects, trees with dbh ≥ 5 cm had average frequencies of 1015 ha-1 and whereas the trees ≥ 35 cm had a frequency of 48 ha-1. Allomertic equations based on dbh were used to compute canopy height and above ground biomass for various segments of the transect to estimate the effect of spatial scales from 100 m to 1 km for roughness and biomass estimation. The results for five transects are compared and the scaling criteria are discussed within and across transects.
Submetido por Sassan Sepehri Saatchi em 18-MAR-2004
Tema Científico do LBA: CD (Armazenamento e Trocas de Carbono)