Record Search Query: [Keyword='Temperature']
PNET-BGC: MODELING BIOGEOCHEMICAL PROCESSES (GBONDO-TUGBAWA ET AL. 2001)
Entry ID: model_archive_pnet_bgc_m1
Abstract: An integrated biogeochemical model (PnET-BGC) was
formulated to simulate chemical transformations of vegetation, soil, and
drainage water in northern forest ecosystems. The model operates on a monthly
time step and depicts the major biogeochemical processes, such as forest canopy
element transformations, hydrology, soil organic matter dynamics, nitrogen
cycling, geochemical weathering, and ... chemical equilibrium reactions involving
solid and solution phases. The model was evaluated against soil and stream data
at the Hubbard Brook Experimental Forest, New Hampshire. Model predictions of
concentrations and fluxes of major elements generally agreed reasonably well
with measured values, as estimated by normalized mean error and normalized mean
absolute error. Model output of soil base saturation and stream acid
neutralizing capacity were sensitive to parameter values of soil partial
pressure of carbon dioxide, soil mass, soil cation exchange capacity, and soil
selectivity coefficients of calcium and aluminum. PnET-BGC can be used as a
tool to evaluate the response of soil and water chemistry of forest ecosystems
to disturbances such as clear-cutting, climatic events, and atmospheric
deposition.PnET-BGC, was used to investigate inputs and dynamics of S in a
northern hardwood forest at the Hubbard Brook Experimental Forest (HBEF)
(Gbondo-Tugbawa et al., 2002). The changes in soil S pools and stream-water
were simulated to assess the response 22 SO4 to both atmospheric S deposition
and forest clear-cutting disturbances. Watershed studies across the
northeastern United States have shown that stream losses of exceed atmospheric
sulfur (S) deposition. Understanding the processes responsible for this
additional source of S is critical to quantifying ecosystem response to ongoing
and potential future controls on SO2 emission.
Gbondo-Tugbawa, S.S., C.T. Driscoll , J.D. Aber and G.E. Likens. 2005.
PnET-BGC: Modeling Biogeochemical Processes in a Northern Hardwood Forest
Ecosystem. Model product. Available on-line [http://www.daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.
Gbondo-Tugbawa, S.S., C.T. Driscoll, M. J. Mitchell and J. D. Aber. 2002. A Model to simulate the response of a northern hardwood forest ecosystem to changes in sulfur deposition. Ecological Applications 12:8-23.
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