Evaluation of direct and indirect phosphorus limitation of methanogenic pathways in a calcareous subtropical wetland soil

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• 作者：Cass ; ra A. Medvedeff ; Kanika S. Inglett ; Patrick W. Inglett
• 关键词：Nutrient limitation ; Carbon ; Everglades ; Syntrophs ; Hydrogenotrophy ; Marl
• 刊名：Soil Biology & Biochemistry
• 出版年：February, 2014
• 年：2014
• 卷：69
• 期：Complete
• 页码：343-345
• 全文大小：593 K

文摘

The effect of phosphorus (P) and carbon (C) on methanogenesis was investigated in a low-P (130聽mg聽P聽kg^鈭? soil) wetland within Everglades National Park. Soil was amended with C substrates (acetate, formate, butyrate, and glucose) with or without P, and CO₂ and CH₄ production was monitored. Production of CH₄ increased with P addition although no effect on CO₂ was observed. Methane production was stimulated by all C substrates except for butyrate. No effect of C on CO₂ production was observed except for stimulation following glucose addition. Production of CH₄ 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 CH₄ production and lowered the CO₂-C:CH₄-C ratio relative to the corresponding C only treatment, suggesting that P may have limited acetoclastic methanogens and fermentation.