Modeling Methane Emissions from Amazon Floodplain Ecosystems

被引:10
|
作者
Potter, Christopher [1 ]
Melack, John M. [2 ,3 ]
Engle, Diana [4 ]
机构
[1] NASA Ames Res Ctr, Biospher Sci Branch, Moffett Field, CA USA
[2] Univ Calif Santa Barbara, Dept Ecol Evolut & Marine Biol, Santa Barbara, CA 93106 USA
[3] Univ Calif Santa Barbara, Bren Sch Environm Sci andManagement, Santa Barbara, CA 93106 USA
[4] Univ Calif Santa Barbara, Earth Res Inst, Santa Barbara, CA 93106 USA
关键词
Methane; Amazon; Floodplain; Modeling; Wetlands; GLOBAL WETLAND EXTENT; MACROPHYTE COVER; NATURAL WETLANDS; CARBON-DIOXIDE; PRESENT STATE; PRODUCTIVITY; LAKE; VARIABILITY; DYNAMICS; CLIMATE;
D O I
10.1007/s13157-014-0516-3
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
A new process-based simulation model to estimate methane emissions from Amazon floodplain ecosystems is described and evaluated in comparison to independent measurements of methane fluxes. The model's three major components are 1) types of wetland vegetation and the changes in water level, temperature and dissolved oxygen of flooded areas, 2) plant production, biomass accumulation, and litterfall decay in soils and sediments, and 3) methane production and transport pathways through the water column and into the atmosphere. Ecological and limnological data from Lake Calado, a well-studied site in the central Amazon basin, were used to develop the model. One set of model simulations were generated for floating macrophytes. Predicted rates of CH4 emission to the atmosphere by all simulated transfer pathways were typically in the range of 0.25 to 0.33 g C m(-2) day(-1). Simulated CH4 emissions from flooded forests were predicted to be around 0.25 g m(-2) day(-1), nearly all by ebullition. These rates compare favorably to rates measured in Amazon floodplain habitats.
引用
收藏
页码:501 / 511
页数:11
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