Elevated carbon dioxide accelerates the spatial turnover of soil microbial communities

TitleElevated carbon dioxide accelerates the spatial turnover of soil microbial communities
Publication TypeJournal Article
Year of Publication2015
AuthorsDeng, Y
Secondary AuthorsHe, Z, Xiong, J, Yu, H, Xu, M, Hobbie, SE, Reich, PB, Schadt, CW, Kent, A, PENDALL, ELISE, Wallenstein, M, Zhou, J
JournalGlobal Change Biology
Keywordsb-diversity, elevated carbon dioxide, free air CO2 enrichment, microbial community, spatial turnover rate

Although elevated CO2 (eCO2) significantly affects the a-diversity, composition, function, interaction and dynamics
of soil microbial communities at the local scale, little is known about eCO2 impacts on the geographic distribution of
micro-organisms regionally or globally. Here, we examined the b-diversity of 110 soil microbial communities across
six free air CO2 enrichment (FACE) experimental sites using a high-throughput functional gene array. The b-diversity
of soil microbial communities was significantly (P < 0.05) correlated with geographic distance under both CO2 conditions,
but declined significantly (P < 0.05) faster at eCO2 with a slope of 0.0250 than at ambient CO2 (aCO2) with a
slope of 0.0231 although it varied within each individual site, indicating that the spatial turnover rate of soil microbial
communities was accelerated under eCO2 at a larger geographic scale (e.g. regionally). Both distance and soil
properties significantly (P < 0.05) contributed to the observed microbial b-diversity. This study provides new
hypotheses for further understanding their assembly mechanisms that may be especially important as global CO2
continues to increase.