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Michael Keller, Ruth Varner, Jadson D. Dias, Hudson Silva, Patrick Crill, Raimundo Cosme de Oliveira Jr., and Gregory P. Asner

( Davidson et al. 2000 ). The soils of tropical forests are globally important sources of both N 2 O and NO ( Matson and Vitousek 1990 ; Davidson and Kingerlee 1997 ). Well-drained upland soils generally consume CH 4 from the atmosphere and soil moisture content regulates the flux through its control on the diffusion of CH 4 into the soil ( Crill 1991 ; Born et al. 1990 ). Tropical forest soils can change from a sink to a source of CH 4 depending upon soil moisture conditions and land use ( Keller

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Tomas F. Domingues, Joseph A. Berry, Luiz A. Martinelli, Jean P. H. B. Ometto, and James R. Ehleringer

questions such as: Is the Amazon region currently behaving as a source or a sink for atmospheric carbon? And furthermore, how will such behavior change in the future? To build up the necessary knowledge needed to answer such questions, several studies evaluated measurements and models of carbon fluxes and stocks for a variety of primary forest sites in Amazonia. In summary, such studies involved measurements of carbon dioxide fluxes ( Wofsy et al. 1988 ; Fan et al. 1990 ; Grace et al. 1995 ; Malhi et

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Piyachat Ratana, Alfredo R. Huete, and Laerte Ferreira

rainfall resulting in a steep increase in pasture EVI response in March–April 2001 ( Figure 2 ). 4. Conclusions and discussion The “cerrado” biome in central Brazil has been largely converted into agriculture and pasture. This conversion has important implications for local and regional climate change and for changes in carbon fluxes between the atmosphere and the land surface. Thus, a study of seasonal cerrado dynamics and phenology of the diverse cerrado biome encompassing woodland, grassland

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Jeffrey T. Morisette, Louis Giglio, Ivan Csiszar, Alberto Setzer, Wilfrid Schroeder, Douglas Morton, and Christopher O. Justice

satellite-derived fire products to other fire-related LBA projects, including, but not limited to, Trace Gas and Aerosol Fluxes Project 3: Characterization of aerosol optical properties and solar flux for NASA’s LBA-Ecology program (LBA-ECO); Trace Gas and Aerosol Fluxes Project 10: Tropical biomass fires and tropospheric chemistry: chemistry and production of smoke in Brazil; Land Cover and Land Use Change Project 2: Land-cover/land-use change and carbon dynamics in an expanding frontier in western

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Lydia P. Olander, Mercedes M. Bustamante, Gregory P. Asner, Everaldo Telles, Zayra Prado, and Plínio B. Camargo

research on logging impacts in tropical forests focuses on silvicultural aspects, such as damage to remaining trees, regrowth rates, and changes in species composition. Studies are in progress in the Brazilian Amazon to assess the extent and impacts of logging on a regional scale using remote sensing ( Asner et al. 2002 ; Asner et al. 2004a ) and eddy flux towers ( Saleska et al. 2003 ; Rice et al. 2004 ). However, only a handful of the previous or current studies address the potential for changes in

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Cuizhen Wang, Jiaguo Qi, and Mark Cochrane

. Skole , C. A. Nobre , J. L. Hackler , K. T. Lawrence , and W. H. Chomentowski . 2000 . Annual fluxes of carbon from deforestation and regrowth in the Brazilian Amazon. Nature 403 : 301 – 304 . Huete , A. R. 1988 . A soil-adjusted vegetation index (SAVI). Remote Sens. Environ. 25 : 295 – 309 . Huete , A. R. , C. Justice , and W. Van Leeuwen . 1999 . MODIS vegetation index, MODIS algorithm theoretical basis document. NASA Goddard Space Flight Center, 120 pp

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Ana M. B. Nunes and John O. Roads

M. Kanamitsu . 2004 . Physical initialization for the Regional Spectral Model. Preprints, Symp. on Forecasting the Weather and Climate of the Atmosphere and Ocean , Seattle, WA, Amer. Meteor. Soc., CD-ROM, ???? . Pan , H-L. and L. Mahrt . 1987 . Interaction between soil hydrology and boundary layer developments. Bound.-Layer Meteor. 38 : 185 – 202 . Pan , H-L. and W-S. Wu . 1994 . Implementing a mass flux convective parameterization package for the NMC medium

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Douglas C. Morton, Ruth S. DeFries, Yosio E. Shimabukuro, Liana O. Anderson, Fernando Del Bon Espírito-Santo, Matthew Hansen, and Mark Carroll

– 1556 . Houghton , R. A. , D. L. Skole , C. A. Nobre , J. L. Hackler , K. T. Lawrence , and W. H. Chomentowski . 2000 . Annual fluxes of carbon from deforestation and regrowth in the Brazilian Amazon. Nature 403 : 301 – 304 . Huete , A. R. , C. Justice , and W. Van Leeuwen . 1999 . MODIS vegetation index (MOD13). Algorithm Theoretical Basis Document (ATBD), 122 pp. [Available online at http://modis.gsfc.nasa.gov/data/atbd/atbd_mod13.pdf .] . Justice , C. O. , J. R

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