Oral Session #25: Organic Matter Dynamics in Ecosystems.

Presiding: D. Bachelet, Oregon State University.
Monday, August 7, 2000
8:15 AM to 11:45 AM
Cottonwood Room III - Sports Event Center

8:15 AM	Urban carbon: Sources, sinks, and people in Baltimore. SMITH, J. and S.TA PICKETT, P.M GROFFMAN
8:30 AM	Carbon dioxide flux in Antarctic Dry Valley soils. PARSONS, A.N and J.E BARRETT, R.A VIRGINIA, D.H WALL
8:45 AM	Ecosystem-level impacts of mesquite (Prosopis glandulosa) encroachment on C and N pools of herbaceous vegetation and soils in a temperate savanna. HUGHES, R.F. and C.R. MCMURTRY, G.P. ASNER, S.R. ARCHER, C.A. WESSMAN
9:15 AM	Using radiocarbon to estimate rates of nutrient turnover in a California grassland soil chronosequence. BAISDEN, W.T. and R. AMUNDSON, D.L. BRENNER, J. HARDEN, A.C. COOK
9:30 AM	Comparing estimates of soil respiration using chamber-based and tower-based methods. DAVIDSON, E.A. and K. SAVAGE
9:45 AM	Soil CO2 efflux and soil CO2 profile concentrations under old-growth tropical rain forest SCHWENDENMANN, L. and E. VELDKAMP, T. BRENES, J. MACKENSEN, D.A. CLARK, D.B. CLARK, S.F. OBERBAUER
10:00 AM	Break
10:15 AM	Adsorption of soluble organic nutrients along a primary successional chronosequence in the Mt. Shasta mudflows. QUALLS, R.G. and S.D. BRIDGHAM, S.W. TYLER, W.W. MILLER, S.M. USELMAN
10:30 AM	Effect of afforestation on aggregation and particulate organic matter carbon. SIX, J. and S.J. MORRIS, K. PAUSTIAN, E.A. PAUL
10:45 AM	Assessing the spatial and temporal variation in belowground carbon allocation in an old-growth neotropical rain forest. CLARK, D.A. and E. VELDKAMP, L. SCHWENDENMANN, T. BRENES, J. MACKENSEN, S.F. OBERBAUER
11:00 AM	Partitioning carbon fluxes during ecosystem develoment following a disturbance. CLARK, K.L. and H.L. GHOLZ, M. CASTRO
11:15 AM	The role of nitrogen dynamics in modeling historical and projected carbon balance of mature black spruce ecosystems across North America: Comparisons with CO2 fluxes measured in the Boreal Ecosystem Atmosphere Study (BOREAS). CLEIN, J. and ADAVE MCGUIRE, X. ZHANG, D. KICKLIGHTER, J. MELILLO, S. WOFSY, P. JARVIS
11:30 AM	When is net ecosystem productivity positive? JANISCH, J.E. and M.E. HARMON