Seasonality of trace gas emissions from soils in the eastern Amazon
- Woods Hole Research Center, MA (United States)
The eastern Amazon is becoming a mosaic of land use types, including primary forest, secondary forest, degraded pastures, and productive pastures. We are investigating how this land use change affects trace gas emissions from the soils of this region. Precipitation is highly seasonal, with less than 20% of the annual precipitation falling during the 6-month dry season. Despite this seasonality, soil fluxes of CO{sub 2} vary only about 20% between the wet and dry seasons in forests (0.30 v 0.24 g m{sup {minus}2} hr{sup {minus}1}) and degraded pastures (0.14 v 0.11 g m{sup {minus}2}hr{sup {minus}1}). Forest trees and woody plants of the degraded pastures are deep rooted and remain active during the dry season. In contrast, productive pastures from which woody weeds have been removed show larger seasonal variation in CO{sub 2} fluxes, from 0.09 g m{sup {minus}2}hr{sup {minus}1} when the grasses are dormant late in the dry season to 0.21 g m{sup {minus}2}hr{sup {minus}1} early in the wet season. Seasonal patterns of fluxes of NO, N{sub 2}O, and CH{sub 4} are currently being measured, and these preliminary results will also be presented.
- OSTI ID:
- 107148
- Report Number(s):
- CONF-9507129-; ISSN 0012-9623; TRN: 95:006512-0064
- Journal Information:
- Bulletin of the Ecological Society of America, Vol. 76, Issue 3; Conference: 80. anniversary of the transdisciplinary nature of ecology, Snowbird, UT (United States), 30 Jul - 3 Aug 1995; Other Information: PBD: Sep 1995
- Country of Publication:
- United States
- Language:
- English
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