title: Vegetation affects the relative abundances of dominant soil bacterial taxa and soil respiration rates in an upland grassland soil.
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 CO(2)-C efflux.
authors.affiliation: Centre for Ecology & Hydrology, Oxford OX1 3SR, UK.
authors.forename: Bruce C
authors.initials: BC
authors.lastname: Thomson
authors.forename: Nick
authors.initials: N
authors.lastname: Ostle
authors.forename: Niall
authors.initials: N
authors.lastname: McNamara
authors.forename: Mark J
authors.initials: MJ
authors.lastname: Bailey
authors.forename: Andrew S
authors.initials: AS
authors.lastname: Whiteley
authors.forename: Robert I
authors.initials: RI
authors.lastname: Griffiths
mesh_terms: D001419:Bacteria / Q000145:classification / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D044822:Biodiversity; D002244:Carbon / Q000378:metabolism; D002245:Carbon Dioxide / Q000378:metabolism; D004269:DNA, Bacterial / Q000235:genetics; D006109:Poaceae / Q000382:microbiology*; D012150:Polymorphism, Restriction Fragment Length; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012606:Scotland; D017422:Sequence Analysis, DNA; D012987:Soil / Q000032:analysis; D012988:Soil Microbiology
chemical_list: D004269:DNA, Bacterial; D012336:RNA, Ribosomal, 16S; D012987:Soil; D002245:Carbon Dioxide; D002244:Carbon
references.citation: Science. 2004 Jun 11;304(5677):1629-33
references.pmid: 15192218
references.citation: Nucleic Acids Res. 2004 Feb 25;32(4):1363-71
references.pmid: 14985472
references.citation: Appl Environ Microbiol. 1998 Feb;64(2):795-9
references.pmid: 9464425
references.citation: FEMS Microbiol Ecol. 2003 Feb 1;43(1):35-43
references.pmid: 19719694
references.citation: Appl Environ Microbiol. 2006 Jul;72(7):5069-72
references.pmid: 16820507
references.citation: Appl Environ Microbiol. 2007 Aug;73(16):5261-7
references.pmid: 17586664
references.citation: Antonie Van Leeuwenhoek. 2002 Aug;81(1-4):509-20
references.pmid: 12448746
references.citation: Environ Microbiol. 2005 Jun;7(6):828-38
references.pmid: 15892702
references.citation: Can J Microbiol. 2002 Jul;48(7):655-74
references.pmid: 12224564
references.citation: Appl Environ Microbiol. 2005 Jun;71(6):2813-23
references.pmid: 15932972
references.citation: Appl Environ Microbiol. 2001 May;67(5):2284-91
references.pmid: 11319113
references.citation: Appl Environ Microbiol. 1981 Jan;41(1):97-9
references.pmid: 16345705
references.citation: Ecology. 2007 Jun;88(6):1354-64
references.pmid: 17601128
references.citation: Appl Environ Microbiol. 2001 Oct;67(10):4742-51
references.pmid: 11571180
references.citation: Appl Environ Microbiol. 2000 Dec;66(12):5488-91
references.pmid: 11097934
references.citation: Appl Environ Microbiol. 2006 Mar;72(3):1852-7
references.pmid: 16517631
references.citation: Appl Environ Microbiol. 2004 Aug;70(8):4748-55
references.pmid: 15294811
references.citation: Appl Environ Microbiol. 1997 Nov;63(11):4516-22
references.pmid: 9361437
references.citation: Appl Environ Microbiol. 2006 Mar;72(3):1719-28
references.pmid: 16517615
references.citation: Appl Environ Microbiol. 2001 Jan;67(1):172-8
references.pmid: 11133442