title: Linking soil bacterial biodiversity and soil carbon stability.
abstract: Native soil carbon (C) can be lost in response to fresh C inputs, a phenomenon observed for decades yet still not understood. Using dual-stable isotope probing, we show that changes in the diversity and composition of two functional bacterial groups occur with this 'priming' effect. A single-substrate pulse suppressed native soil C loss and reduced bacterial diversity, whereas repeated substrate pulses stimulated native soil C loss and increased diversity. Increased diversity after repeated C amendments contrasts with resource competition theory, and may be explained by increased predation as evidenced by a decrease in bacterial 16S rRNA gene copies. Our results suggest that biodiversity and composition of the soil microbial community change in concert with its functioning, with consequences for native soil C stability.
authors.affiliation: 1] Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, USA [2] Center for Ecosystem Science and Society (Ecoss), Northern Arizona University, Flagstaff, AZ, USA.
authors.forename: Rebecca L
authors.initials: RL
authors.lastname: Mau
authors.affiliation: 1] Translational Genomics Research Institute (TGen North), Flagstaff, AZ, USA [2] Microbial Genetic and Genomics Center (MGGen), Northern Arizona University, Flagstaff, AZ, USA.
authors.forename: Cindy M
authors.initials: CM
authors.lastname: Liu
authors.affiliation: Translational Genomics Research Institute (TGen North), Flagstaff, AZ, USA.
authors.forename: Maliha
authors.initials: M
authors.lastname: Aziz
authors.affiliation: 1] Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, USA [2] Center for Ecosystem Science and Society (Ecoss), Northern Arizona University, Flagstaff, AZ, USA.
authors.forename: Egbert
authors.initials: E
authors.lastname: Schwartz
authors.affiliation: 1] Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, USA [2] Center for Ecosystem Science and Society (Ecoss), Northern Arizona University, Flagstaff, AZ, USA.
authors.forename: Paul
authors.initials: P
authors.lastname: Dijkstra
authors.affiliation: 1] Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, USA [2] Center for Ecosystem Science and Society (Ecoss), Northern Arizona University, Flagstaff, AZ, USA.
authors.forename: Jane C
authors.initials: JC
authors.lastname: Marks
authors.affiliation: Translational Genomics Research Institute (TGen North), Flagstaff, AZ, USA.
authors.forename: Lance B
authors.initials: LB
authors.lastname: Price
authors.affiliation: 1] Center for Ecosystem Science and Society (Ecoss), Northern Arizona University, Flagstaff, AZ, USA [2] Translational Genomics Research Institute (TGen North), Flagstaff, AZ, USA [3] Microbial Genetic and Genomics Center (MGGen), Northern Arizona University, Flagstaff, AZ, USA.
authors.forename: Paul
authors.initials: P
authors.lastname: Keim
authors.affiliation: 1] Department of Biological Sciences, Northern Arizona University, Flagstaff, AZ, USA [2] Center for Ecosystem Science and Society (Ecoss), Northern Arizona University, Flagstaff, AZ, USA.
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Hungate
mesh_terms: D001419:Bacteria / Q000145:classification* / Q000235:genetics; D044822:Biodiversity; D018533:Biomass; D002244:Carbon / Q000737:chemistry*; D017753:Ecosystem; D005947:Glucose / Q000737:chemistry; D007554:Isotopes; D010100:Oxygen / Q000737:chemistry; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology
chemical_list: D007554:Isotopes; D012336:RNA, Ribosomal, 16S; D012987:Soil; D002244:Carbon; D005947:Glucose; D010100:Oxygen