Methane fluxes in permafrost habitats of the Lena Delta: effects of microbial community structure and organic matter quality.

Abstract

For the understanding and assessment of recent and future carbon dynamics of arctic permafrost soils the processes of CH(4) production and oxidation, the community structure and the quality of dissolved organic matter (DOM) were studied in two soils of a polygonal tundra. Activities of methanogens and methanotrophs differed significantly in their rates and distribution patterns among the two investigated profiles. Community structure analysis showed similarities between both soils for ester-linked phospholipid fatty acids (PLFAs) and differences in the fraction of unsaponifiable PLFAs and phospholipid ether lipids. Furthermore, a shift of the overall composition of the microbiota with depth at both sites was indicated by an increasing portion of iso- and anteiso-branched fatty acids related to the amount of straight-chain fatty acids. Although permafrost soils represent a large carbon pool, it was shown that the reduced quality of organic matter leads to a substrate limitation of the microbial metabolism. It can be concluded from our and previous findings first that microbial communities in the active layer of an Arctic polygon tundra are composed by members of all three domains of life, with a total biomass comparable to temperate soil ecosystems, and second that these microorganisms are well adapted to the extreme temperature gradient of their environment.

5 Figures and Tables

Statistics

01020'06'07'08'09'10'11'12'13'14'15'16'17
Citations per Year

77 Citations

Semantic Scholar estimates that this publication has 77 citations based on the available data.

See our FAQ for additional information.

Cite this paper

@article{Wagner2005MethaneFI, title={Methane fluxes in permafrost habitats of the Lena Delta: effects of microbial community structure and organic matter quality.}, author={Dirk Wagner and A. Lipski and Arndt Embacher and Andreas Gattinger}, journal={Environmental microbiology}, year={2005}, volume={7 10}, pages={1582-92} }