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TG-07 Abstract

Soil Biogeochemistry of Carbon, Nutrients, and Trace Gases in the Amazon Region of Brazil: Field and Model Studies of Natural and Managed Conditions

Michael M. Keller — USDA Forest Service (US-PI)
Raimundo Cosme Oliveira Jr. — EMBRAPA Amazônia Oriental (SA-PI)

We propose to address two

theme areas of LBA-Ecology, carbon storage and exchange and trace gas fluxes. 

We plan to estimate ecosystem respiration and trace gas fluxes for the

undisturbed and logged forest sites at the Tapajos National Forest (TNF).  

Our proposed work is summarized in two objectives:









1) Quantification of the

soil-atmosphere exchange of carbon dioxide (CO2), nitrous oxide (N2O), nitric

oxide (NO) and methane (CH4) in logged and undisturbed upland forests on

contrasting soil types over a range of spatial (~m2 to ~km2) and temporal scales

(hours to years) at several LBA forested sites in the Amazon region.





2) Quantification of

ecosystem respiration components (including soil, bole and coarse necromass) in

mature upland forests and in logged forests.









We propose measurements of

trace gases using manually deployed and continously operated automated chambers

and profiles of trace gas mixing ratios from towers at the TNF.  We will

extend our measurements to other LBA tower sites using a portable system for

measurement of soil-atmosphere CO2 flux and profiles of CO2, N2O and CH4.



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