HR: 1340h
AN: B43A-0138    [Abstracts]
TI: CO$_{2}$ Flux from Coarse Woody Debris from a Tropical Forest at the FLONA Tapajos, Brazil
AU: * Silva, H
EM: hsilva@kaos.sr.unh.edu
AF: University of New Hampshire, 39 College Rd, Durham, NH 03824 United States
AU: Crill, P
EM: patrick.crill@geo.su.se
AF: University of New Hampshire, 39 College Rd, Durham, NH 03824 United States
AU: Keller, M
EM: michael@kaos.sr.unh.edu
AF: University of New Hampshire, 39 College Rd, Durham, NH 03824 United States
AU: Keller, M
EM: michael@kaos.sr.unh.edu
AF: University of New Hampshire, 39 College Rd, Durham, NH 03824 United States
AB: The release of carbon dioxide (CO$_{2}$) from tropical forests has a strong effect on the global carbon cycle due to fast turnover rates of organic matter than for other biomes. Despite its importance coarse woody debris (CWD) pools have been overlooked for estimates of carbon balance and especially in tropical forests where few studies have been conducted. Measurements were made on CWD in areas of undisturbed tropical forests and areas under selective logging. CO$_{2}$ emissions from CWD averaged 1.95 \pm 1.95 \mu mol CO$_{2}$ m$^{2}$ Wood $_{surf}$^{-1}$$ s$^{-1}$ for undisturbed forests and 2.61 \pm 1.44 \mu mol CO$_{2}$ m$^{2}$ Wood $_{surf}$^{-1}$$ s$^{-1}$ for selective logging areas. For selective logging areas, a chronosequence study was established to follow up the five years of logging. Three wood species were sorted due differences in density to be studied and observe differences in CO$_{2}$ efflux. Andiroba (Carapa guianensis) showed a average flux of 3.15 \pm 3.2 \mu mol CO$_{2}$ m$^{2}$ Wood $_{surf}$^{-1}$$ s$^{-1}$, tauari (Couratari stellata) with 2.88 \pm 2.03 \mu mol CO$_{2}$ m$^{2}$ Wood $_{surf}$^{-1}$$ s$^{-1}$ and macaranduba (Manilkara huberi) with an average flux of 1.69 \pm 1.6 \mu mol CO$_{2}$ m$^{2}$ Wood $_{surf}$^{-1}$$ s$^{-1}$. An area of undisturbed forest was studied to quantify the efflux of CO$_{2}$ in natural conditions. CO$_{2}$ emissions from CWD were of 3.76 Mg C ha$^{-1}$ y${-1}$ in logged areas and 1.43 Mg C ha$^{-1}$ y${-1}$ for undisturbed forests. Wood water content and wood decay classes (year of logging) were some of the factors studied on controlling of CO$_{2}$ efflux from CWD.
DE: 0315 Biosphere/atmosphere interactions
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting