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FEMS Microbiol Ecol ; 92(12)2016 12.
Article in English | MEDLINE | ID: mdl-27612495

ABSTRACT

Impacts of long-term CO2 exposure on environmental processes and microbial populations of near-surface soils are poorly understood. This near-surface long-term CO2 injection study demonstrated that soil microbiology and geochemistry is influenced more by seasonal parameters than elevated CO2 Soil samples were taken during a 3-year field experiment including sampling campaigns before, during and after 24 months of continuous CO2 injection. CO2 concentrations within CO2-injected plots increased up to 23% during the injection period. No CO2 impacts on geochemistry were detected over time. In addition, CO2-exposed samples did not show significant changes in microbial CO2 and CH4 turnover rates compared to reference samples. Likewise, no significant CO2-induced variations were detected for the abundance of Bacteria, Archaea (16S rDNA) and gene copy numbers of the mcrA gene, Crenarchaeota and amoA gene. The majority (75%-95%) of the bacterial sequences were assigned to five phyla: Firmicutes, Proteobacteria, Actinobacteria, Acidobacteria and Bacteroidetes The majority of the archaeal sequences (85%-100%) were assigned to the thaumarchaeotal cluster I.1b (soil group). Univariate and multivariate statistical as well as principal component analyses showed no significant CO2-induced variation. Instead, seasonal impacts especially temperature and precipitation were detected.


Subject(s)
Bacteria/classification , Carbon Dioxide/chemistry , Carbon Dioxide/pharmacology , Crenarchaeota/classification , Soil Microbiology , Soil/chemistry , Bacteria/drug effects , Bacteria/genetics , Crenarchaeota/drug effects , Crenarchaeota/genetics , DNA, Ribosomal/genetics , Greenhouse Effect , Phylogeny , RNA, Ribosomal, 16S/genetics , United Kingdom
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