| Popis: |
The effect of phosphorus (P) and carbon (C) on methanogenesis was investigated in a low-P (130 mg P kg −1 soil) wetland within Everglades National Park. Soil was amended with C substrates (acetate, formate, butyrate, and glucose) with or without P, and CO 2 and CH 4 production was monitored. Production of CH 4 increased with P addition although no effect on CO 2 was observed. Methane production was stimulated by all C substrates except for butyrate. No effect of C on CO 2 production was observed except for stimulation following glucose addition. Production of CH 4 following formate addition was not affected by P, suggesting hydrogenotrophic methanogens may be substrate, not P, limited. Addition of P to all other C substrates heightened CH 4 production and lowered the CO 2 –C:CH 4 –C ratio relative to the corresponding C only treatment, suggesting that P may have limited acetoclastic methanogens and fermentation. |
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