Necromass Density Estimates from Two Brazilian Amazonia Forests
Michael
William
Palace, University of New Hampshire, palace@kaos.sr.unh.edu
(Presenting)
Michael
M.
Keller, University of New Hampshire,USDA Forest Service, International Institute of Tropical Forestry, michael.keller@unh.edu
José
Natalino Macedo
Silva, EMBRAPA-Amazonia Oriental, natalino@cpatu.embrapa.br
Gregory
Paul
Asner, Department of Global Ecology, Carnegie Institution of Washington, Stanford University, gpa@stanford.edu
Coarse woody debris (CWD) can make up a large proportion of the carbon pool in a tropical forest. Knowledge of this pool and the fluxes related to it is vital for understanding terrestrial ecosystem processes. The density of CWD is important in accurately quantifying the CWD mass from volume estimates. We measured the densities of CWD in two Brazilian forests, Tapajos National Forest, Para, and Juruena, Mato Grosso, Brazil. Measurements were conducted in logged forest and undisturbed forest. CWD density was calculated from the density of wood plug samples and adjusted for void space. Density of wood was determined using a unique plug extraction technique for large CWD (>10 cm diameter) in 5 decay classes from fresh (1) to rotten (5) and two smaller diameter classes; 2-5cm and 5-10 cm. Estimates of plug density for decay classes 1 to 5 are 0.61, 0.71, 0.63, 0.58, and 0.32 g cm-3 at Tapajos. Densities for smaller classes were 0.36 g cm-3 for 2-5cm and 0.45 g cm-3 for 5-10 cm at Tapajos. Juruena estimates of density for decay classes 1 to 5 are 0.71, 0.68, 064, 0.60, and 0.45 g cm-3. Juruena densities for smaller classes were 0.51 g cm-3 for 2-5cm and 0.47 g cm-3 for 5-10 cm. Currently, we are examining the void estimation and adjusted densities between the two sites. Since this study indicates little difference in density across decay class between sites, these density estimates may be more generally applicable in other areas of the Amazon.
Submetido por Michael William Palace em 18-MAR-2004
Tema Científico do LBA: CD (Armazenamento e Trocas de Carbono)