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CARBON AND NITROGEN DYNAMICS WITH ENHANCED WIND EROSION-MODEL EVALUATION AND PREDICTION $100.00
Authors:  Junran Li and Gregory S. Okin
Abstract:
Most of the studies to date on wind erosion and ecosystem changes have focused on
field observations and laboratory analyses. Relatively few studies have applied
biogeochemical models to understanding the consequence of wind erosion in ecosystem
changes. In this study, we evaluate the CENTURY model for its ability to provide
predictions about the influence of wind erosion on C and N dynamics. Although this
model has been extensively tested for a variety of ecosystems, different episodic events,
and climate change scenarios, no study to date has incorporated wind erosion in
combination with projected climate scenarios in the Chihuahuan Desert ecosystem,
southern New Mexico. This study successfully parameterized the CENTURY model in
these shrubby grassland ecosystems, having enhanced wind erosion encouraged by
manual vegetation cover reduction. The model showed good correspondence between
observed and estimated soil organic C and N prior to vegetation cover reduction, whereas
empirical regression models failed to estimate satisfactory results. The results from the
CENTURY simulations showed that C and N pools may be significantly changed with
the alteration of plant community composition, but this is driven in the model primarily
by vegetation change and not wind erosion of nutrient-rich topsoil. Without a specific
submodel for erosion, current version of CENTURY may underestimate the function of
wind erosion in depleting surface soil C and N. Fortunately, a newer version of
CENTURY, which includes a layered erosion and deposition submodel, is expected to
release in the near future. 


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CARBON AND NITROGEN DYNAMICS WITH ENHANCED WIND EROSION-MODEL EVALUATION AND PREDICTION