Wetlands are a substantial source of CH 4 production due to emissions during anaerobic conditions in inundated sediments. Knowledge of the factors that affect CH 4 flux in wetlands is very important in estimating CH 4 dynamics and predicting future changes in global climate. This paper reviews approaches for the estimation of the controlling variables of CH 4 dynamics in wetlands. CH 4 emissions from wetlands are mainly dependent on the combined effects of temperature, water level, carbon supply, and presence/productivity of vegetation. Changes in temperature affect CH 4 emission not only by a direct in fluence on methanogens but also by modifying the quantity of carbon substrates from primary production and organic matter decomposition. Water level fluctuation is another key factor affecting CH 4 flux, which can modify methane dynamics by inhibiting or activating methanogens as well as methanotrophic bacteria. Vegetation functions as a conduit for CH 4 release and a key carbon supplier for methanogens. Global climate change is expected to modify all of these factors in addition to contributing directly to CO 2 emission and fertilization effects. The consequences of any changes in CO 2 emission level from wetlands would be additional shifts in the amount and regional distribution of CH 4 emissions from wetlands.
|Title of host publication||Global Change and the Function and Distribution of Wetlands|
|Number of pages||16|
|Publication status||Published - 2012 Jan 1|
All Science Journal Classification (ASJC) codes
- Agricultural and Biological Sciences(all)
- Environmental Science(all)