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Plant species richness, identity and productivity differentially influence key groups of microbes in grassland soils of contrasting fertility

De Deyn, Gerlinde and Quirk, Helen and Bardgett, Richard (2011) Plant species richness, identity and productivity differentially influence key groups of microbes in grassland soils of contrasting fertility. Biology Letters, 7 (1). pp. 75-78. ISSN 1744-9561

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Abstract

The abundance of microbes in soil is thought to be strongly influenced by plant productivity rather than by plant species richness per se. However, whether this holds true for different microbial groups and under different soil conditions is unresolved. We tested how plant species richness, identity and biomass influence the abundances of arbuscular mycorrhizal fungi (AMF), saprophytic bacteria and fungi, and actinomycetes, in model plant communities in soil of low and high fertility using phospholipid fatty acid analysis. Abundances of saprophytic fungi and bacteria were driven by larger plant biomass in high diversity treatments. In contrast, increased AMF abundance with larger plant species richness was not explained by plant biomass, but responded to plant species identity and was stimulated by Anthoxantum odoratum. Our results indicate that the abundance of saprophytic soil microbes is influenced more by resource quantity, as driven by plant production, while AMF respond more strongly to resource composition, driven by variation in plant species richness and identity. This suggests that AMF abundance in soil is more sensitive to changes in plant species diversity per se and plant species composition than are abundances of saprophytic microbes.

Item Type: Article
Journal or Publication Title: Biology Letters
Uncontrolled Keywords: AMF ; biodiversity ; soil ; ecosystem functioning ; grassland ; phospholipid fatty acid
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 60133
Deposited By: ep_importer_pure
Deposited On: 20 Nov 2012 10:16
Refereed?: Yes
Published?: Published
Last Modified: 17 Sep 2013 08:44
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/60133

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