Wetlands CH4 emission

Figure 6 The relationship between wetland CH4 emissions and various measures of primary productivity (a) emissions versus net ecosystem production (NEP) in North-American ecosystems ranging from the subtropics to the subarctic (b) emissions versus GPP in fen peatland mesocosms with high or low water table depths and (c) emissions versus whole-plant net photosynthesis in marsh microcosms exposed to elevated and ambient concentrations of atmospheric CO2. (after Whiting and Chanton, (1993) Updergraff et al., (2001) and Vann and Megonigal (2003), respectively).

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