Articles | Volume 15, issue 6
Biogeosciences, 15, 1879–1894, 2018
Biogeosciences, 15, 1879–1894, 2018

Research article 29 Mar 2018

Research article | 29 Mar 2018

Soil microbial biomass, activity and community composition along altitudinal gradients in the High Arctic (Billefjorden, Svalbard)

Petr Kotas1,2, Hana Šantrůčková1, Josef Elster3,4, and Eva Kaštovská1 Petr Kotas et al.
  • 1Department of Ecosystem Biology, Faculty of Science, University of South Bohemia, České Budějovice, 370 05, Czech Republic
  • 2Institute of Chemistry and Biochemistry, Faculty of Science, University of South Bohemia, České Budějovice, 370 05, Czech Republic
  • 3Centre for Polar Ecology, Faculty of Science, University of South Bohemia, České Budějovice, 370 05, Czech Republic
  • 4Centre for Phycology, Institute of Botany, Academy of Sciences of the Czech Republic, Třeboň, 379 82, Czech Republic

Abstract. The unique and fragile High Arctic ecosystems are vulnerable to global climate warming. The elucidation of factors driving microbial distribution and activity in arctic soils is essential for a comprehensive understanding of ecosystem functioning and its response to environmental change. The goals of this study were to investigate microbial biomass and activity, microbial community structure (MCS), and their environmental controls in soils along three elevational transects in the coastal mountains of Billefjorden, central Svalbard. Soils from four different altitudes (25, 275, 525 and 765 m above sea level) were analyzed for a suite of characteristics including temperature regimes, organic matter content, base cation availability, moisture, pH, potential respiration, and microbial biomass and community structure using phospholipid fatty acids (PLFAs). We observed significant spatial heterogeneity of edaphic properties among transects, resulting in transect-specific effects of altitude on most soil parameters. We did not observe any clear elevation pattern in microbial biomass, and microbial activity revealed contrasting elevational patterns between transects. We found relatively large horizontal variability in MCS (i.e., between sites of corresponding elevation in different transects), mainly due to differences in the composition of bacterial PLFAs, but also a systematic altitudinal shift in MCS related to different habitat preferences of fungi and bacteria, which resulted in high fungi-to-bacteria ratios at the most elevated sites. The biological soil crusts on these most elevated, unvegetated sites can host microbial assemblages of a size and activity comparable to those of the arctic tundra ecosystem. The key environmental factors determining horizontal and vertical changes in soil microbial properties were soil pH, organic carbon content, soil moisture and Mg2+ availability.

Short summary
The soil microbial properties were investigated along altitudinal gradients in the Arctic. Systematic altitudinal shift in MCS resulting in high F / B ratios at the most elevated sites was observed. The changes in composition, size and activity of microbial communities were mainly controlled through the effect of vegetation on edaphic properties and by bedrock chemistry. The upward migration of vegetation due to global warming will likely diminish the spatial variability in microbial properties.
Final-revised paper