Influences of Plant Species Composition,Fertilisation and <Emphasis Type="Italic">Lolium perenne</Emphasis> Ingression on Soil Microbial Community Structure in Three Irish Grasslands |
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Authors: | Email author" target="_blank">Ann-Kathrin?LiliensiekEmail author Dwipendra?Thakuria Nicholas?Clipson |
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Institution: | (1) School of Biology and Environmental Sciences, University College Dublin, Belfield, Dublin 4, Ireland |
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Abstract: | Semi-natural grassland soils are frequently fertilised for agricultural improvement. This practice often comes at a loss of
the indigenous flora while fast-growing nitrogen-responsive species, such as Lolium perenne, take over. Since soil microbial communities depend on plant root exudates for carbon and nitrogen sources, this shift in
vegetation is thought to influence soil microbial community structure. In this study, we investigated the influence of different
plant species, fertilisation and L. perenne ingression on microbial communities in soils from three semi-natural Irish grasslands. Bacterial and fungal community compositions
were determined by automated ribosomal intergenic spacer analysis, and community changes were linked to environmental factors
by multivariate statistical analysis. Soil type had a strong effect on bacterial and fungal communities, mainly correlated
to soil pH, as well as soil carbon and nitrogen status. Within each soil type, plant species composition was the main influencing
factor followed by nitrogen fertilisation and finally Lolium ingression in the acidic upland and mesotrophic grassland. In the alkaline grassland, however, Lolium ingression had a stronger effect than fertilisation. Our results suggest that a change in plant species diversity strongly
influences the microbial community structure, which may subsequently lead to significant changes in ecosystem functioning. |
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