Vegetation Affects the Relative Abundances of Dominant Soil Bacterial Taxa and Soil Respiration Rates in an Upland Grassland Soil |
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Authors: | Bruce C Thomson Nick Ostle Niall McNamara Mark J Bailey Andrew S Whiteley Robert I Griffiths |
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Institution: | (1) Centre for Ecology & Hydrology, Mansfield Road, Oxford, OX1 3SR, UK;(2) Centre for Ecology & Hydrology, Lancaster Environment Centre, Library Avenue, Bailrigg, Lancaster, LA1 4AP, UK; |
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Abstract: | Plant-derived organic matter inputs are thought to be a key driver of soil bacterial community composition and associated
soil processes. We sought to investigate the role of acid grassland vegetation on soil bacterial community structure by assessing
bacterial diversity in combination with other soil variables in temporally and spatially distinct samples taken from a field-based
plant removal experiment. Removal of aboveground vegetation resulted in reproducible differences in soil properties, soil
respiration and bacterial diversity. Vegetated soils had significantly increased carbon and nitrogen concentrations and exhibited
higher rates of respiration. Molecular analyses revealed that the soils were broadly dominated by Alphaproteobacterial and
Acidobacterial lineages, with increased abundances of Alphaproteobacteria in vegetated soils and more Acidobacteria in bare
soils. This field-based study contributes to a growing body of evidence documenting the effect of soil nutrient status on
the relative abundances of dominant soil bacterial taxa, with Proteobacterial taxa dominating over Acidobacteria in soils
exhibiting higher rates of C turnover. Furthermore, we highlight the role of aboveground vegetation in mediating this effect
by demonstrating that plant removal can alter the relative abundances of dominant soil taxa with concomitant changes in soil
CO2-C efflux. |
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