Freeze-thaw cycles have minimal effect on the mineralisation of low molecular weight, dissolved organic carbon in Arctic soils

Polar Biology
A FosterP Roberts

Abstract

Warmer winters in Arctic regions may melt insulating snow cover and subject soils to more freeze-thaw cycles. The effect of freeze-thaw cycles on the microbial use of low molecular weight, dissolved organic carbon (LMW-DOC) is poorly understood. In this study, soils from the Arctic heath tundra, Arctic meadow tundra and a temperate grassland were frozen to -7.5 °C and thawed once and three times. Subsequently, the mineralisation of 3 LMW-DOC substrates types (sugars, amino acids and peptides) was measured over an 8-day period and compared to controls which had not been frozen. This allowed the comparison of freeze-thaw effects between Arctic and temperate soil and between different substrates. The results showed that freeze-thaw cycles had no significant effect on C mineralisation in the Arctic tundra soils. In contrast, for the same intensity freeze-thaw cycles, a significant effect on C mineralisation was observed for all substrate types in the temperate soil although the response was substrate specific. Peptide and amino acid mineralisation were similarly affected by FT, whilst glucose had a different response. Further work is required to fully understand microbial use of LMW-DOC after freeze-thaw, yet these results suggest ...Continue Reading

References

Jan 1, 1981·Annual Review of Microbiology·M Alexander
Jan 1, 1994·Advances in Microbial Physiology·J W Payne, M W Smith
Feb 17, 2001·Nitric Oxide : Biology and Chemistry·K M MirandaD A Wink
Apr 16, 2009·Microbial Ecology·Minna K MännistöMax M Häggblom
Jul 29, 2010·Environmental Technology·Sandra L Wilson, Virginia K Walker
Nov 17, 2010·Proceedings of the National Academy of Sciences of the United States of America·Stina Harrysson DrotzMats G Oquist
Apr 1, 2009·Environmental Microbiology Reports·Shawna K McMahonJoshua P Schimel
Dec 1, 1983·Microbial Ecology·C R MorleyC Cambardella

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