Soil Bacterial and Fungal Community Structure Across a Range of Unimproved and Semi-Improved Upland Grasslands |
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Authors: | Nabla Kennedy Suzanne Edwards Nicholas Clipson |
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Institution: | (1) Microbial Ecology Group, Department of Industrial Microbiology, University College Dublin, Belfield, Dublin 4, Ireland;(2) Present address: Ecosystem Science and Management Program, University of Northern British Columbia, 3333 University Way, Prince George, BC, V2N 4Z9, Canada |
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Abstract: | Changes in soil microbial community structure due to improvement are often attributed to concurrent shifts in floristic community
composition. The bacterial and fungal communities of unimproved and semi-improved (as determined by floristic classification)
grassland soils were studied at five upland sites on similar geological substrata using both broad-scale (microbial activity
and fungal biomass) and molecular terminal restriction fragment length polymorphism (TRFLP), automated ribosomal intergenic
spacer analysis (ARISA)] approaches. It was hypothesized that microbial community structure would be similar in soils from
the same grassland type, and that grassland vegetation classifications could thus be used as predictors of microbial community
structure. Microbial community measurements varied widely according to both site and grassland type, and trends in the effect
of grassland improvement differed between sites. These results were consistent with those from similar studies, and indicated
that floristic community composition was not a stable predictor of microbial community structure across sites. This may indicate
a lack of correlation between grassland plant composition and soil microbial community structure, or that differences in soil
chemistry between sites had larger impacts on soil microbial populations than plant-related effects. |
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