Tracer Analysis of Methanogenesis in Salt Marsh Soils †

AUTOR(ES)

King, Gary M.

RESUMO

Differences in paths of carbon flow have been found in soils of the tall (TS) and short (SS) Spartina alterniflora marshes of Sapelo Island, Ga. Gaseous end products of [U-14C]glucose metabolism were 14CO2 and 14CH4 in the SS region and primarily 14CO2 in the TS region. Sulfate concentration did not demonstrably affect glucose catabolism or the distribution of end products in either zone. [U-14C]acetate was converted to 14CO2 and 14CH4 in the SS soils and almost exclusively to 14CO2 in the TS soils. Sulfate concentration did not affect acetate metabolism in the SS soils; however, a noticeable effect of sulfate dilution was seen in TS soils. Sulfate dilution in TS samples resulted in increased methane formation. Total glucose and acetate metabolism were similar in TS and SS soils despite differences in end products. A microbial community characterized by fermentative/sulfate-reducing processes has developed in TS soils as opposed to the fermentative/methanogenic/sulfate-reducing community found in SS soils.

Documentos Relacionados

• Arylsulfatase Activity in Salt Marsh Soils †
• Effects of Metals on Methanogenesis, Sulfate Reduction, Carbon Dioxide Evolution, and Microbial Biomass in Anoxic Salt Marsh Sediments †
• End Products of Anaerobic Chitin Degradation by Salt Marsh Bacteria as Substrates for Dissimilatory Sulfate Reduction and Methanogenesis †
• Populations of Methane-Producing Bacteria and In Vitro Methanogenesis in Salt Marsh and Estuarine Sediments
• Mineralization of Detrital Lignocelluloses by Salt Marsh Sediment Microflora †