Soil Biology and Biochemistry, June, 2012, Vol.49, p.184(9)
To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.soilbio.2012.01.032 Byline: Monika Welc (a), Else K. Bunemann (a), Andreas Flie[sz]bach (b), Emmanuel Frossard (a), Jan Jansa (a)(c) Abstract: Microbial communities are important components of terrestrial ecosystems. The importance of their diversity and functions for natural systems is well recognized. However, a better understanding of successional changes of microbial communities over long time scales is still required. In this work, the size and composition of microbial communities in soils of a deglaciation chronosequence at the Damma glacier forefield were studied by fatty acid profiling. Soil fatty acid concentrations clearly increased with soil age. The abundances of arbuscular mycorrhizal fungi (AMF), bacteria and other soil fungi, however, were more affected by abiotic soil parameters like carbon content and pH than by soil age. Analysis of ratios of the different microbial groups (AMF, fungi, bacteria) along the soil chronosequence indicated that: i) the ratios of AMF to bacteria and AMF to fungi decreased with soil age; and ii) the ratio of fungi to bacteria remained unchanged along the soil chronosequence. These two pieces of evidence suggest that the evolution of this ecosystem proceeds at an uneven pace over time and that the role of AMF is less important in older, more organic and acidified soils than in mineral soils. In contrast to other studies, no successional replacement of bacteria with fungi in more acidified and organic soil was observed. Author Affiliation: (a) ETH Zurich, Institute of Agricultural Sciences, FMG C 18, Eschikon 33, 8315 Lindau (ZH), Switzerland (b) Research Institute of Organic Agriculture (FiBL), Department of Soil Sciences, Ackerstrasse, 5070 Frick, Switzerland (c) Institute of Microbiology, Academy of Sciences of the Czech Republic, VideAska 1083, Praha 4 - KrA, Czech Republic Article History: Received 10 October 2011; Revised 21 January 2012; Accepted 30 January 2012
Soil Microbiology -- Analysis ; Soil Carbon -- Analysis ; Organic Farming -- Analysis ; Ecosystems -- Analysis ; Bacteria -- Analysis ; Fatty Acids -- Analysis ; Terrestrial Ecosystems -- Analysis ; Fungi -- Analysis
Cengage Learning, Inc.