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CD-12 Abstract

A Pilot Study for Assessing the Carbon and Energy Balance of a Transitional Tropical Forest in Southwest Amazonia

Nicolau Priante Filho — UFMT - Universidade Federal do Mato Grosso (SA-PI)
George L. Vourlitis — California State University (US-PI)

This cooperative project between California State

University-San Marcos (CSUSM) and the Universidade Federal de Mato Grosso (UFMT)

is designed to quantify the seasonal and interannual variations in the mass (CO2

and H2O vapor) energy exchange of an Amazonian tropical transitional forest.†

Our study site is located near Sinop, Mato Grosso in a transitional (ecotonal)

region that separates the tropical rain forest and savanna.† Mass and

energy exchange is measured using tower-based eddy covariance over a mature,

undisturbed transitional tropical forest that is approximately 28-30 m tall.†

Additional field measurements include leaf photosynthesis, soil CO2 efflux, soil

water content and water table depth, leaf area index, aboveground litter

production, litter decomposition, and micrometerology; data that are required

for interpreting the temporal variations forest mass and energy exchange.†

Our previous LBA research significantly helped build capacity in South American

institutions by intensive training of UFMT undergraduate and graduate students

and faculty and the development of a M.Sc. degree program in environmental

physics that was recently approved by the Coordenac„o de Aperfeicoamento de

Pessoal de Nivel Superior (CAPES).† Our group is also beginning a

comparable research campaign in cattle pasture that is adjacent to the mature

forest stand and a proposed tower in a selectively-logged stand near our Sinop

site is pending approval from the USDA.† With these additional projects, we

hope to be able to develop a comprehensive picture of how land cover change and

land use alter mass and energy exchange of transitional tropical systems in

southern Amazonia, and ultimately, allow for collaborative assessments of how

land cover change and climate alter the mass and energy exchange of the Amazon Basin.

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