Abstract
The quantitative relationships between the biodegradative activities of peatland microorganisms and several relevant physiochemical environmental parameters were examined. Temperature decrease from 30 to 4 °C was found to slow, but not eliminate, microbial activity (mineralization of 14C compounds to 14CO2). Microbial activity generally was higher at ambient peatland pH's (pH 3–4.5), rather than at more neutral pH's, in the media used. Low oxygen tension significantly decreased the metabolic activities of peatland surface-inhabiting microbes. Individual pure cultures isolated from peatlands exhibited different responses to decreasing pH, oxygen tension, and temperature; demonstrating great physiological diversity among peatland microbes. Concentrations of nutrients such as nitrogen and phosphorus appear not to limit severely most microbial activities in peatland habitats.
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