HR: 14:55h
AN: B53D-05    [Abstracts]
TI: Carbon isotopes and the measurement of biochemically protected fractions
AU: * Conant, R T
EM: conant@nrel.colostate.edu
AF: Colorado State University, Natural Recource Ecology Laboratory Campus Delivery 1499, Fort Collins, CO 80523-1499 United States
AU: Plante, A
EM: plante@nrel.colostate.edu
AF: Colorado State University, Natural Recource Ecology Laboratory Campus Delivery 1499, Fort Collins, CO 80523-1499 United States
AU: Morris, S J
EM: sjmorris@bumail.bradley.edu
AF: Bradley University, Department of Biology, Peoria, IL 61625
AU: Paul, E A
EM: eldor@nrel.colostate.edu
AF: Colorado State University, Natural Recource Ecology Laboratory Campus Delivery 1499, Fort Collins, CO 80523-1499 United States
AB: Several chemical fractionation methods purport to isolate soil carbon that is biochemically resistant to decomposition. These fractions are often 1300-1500 years older than whole soil C. The standard model of soil carbon dynamics suggests that biochemcially resistant C should not be lost quickly upon cultivation or land use change, decompose rapidly during laboratory incubations, or accrue as fast as whole soil C. But, in some cases these fractions decompose or build up rapidly. What explains these unexpected changes? What are the implications for modeling measureable soil C fractions? What are the general implications for our understanding of soil C dynamics? We review the literature and evaluate new data from field studies and laboratory incubations to address these important questions.
DE: 4806 Carbon cycling
DE: 1600 GLOBAL CHANGE (New category)
DE: 0400 Biogeosciences
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting