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Divergent responses of forest soil microbial communities under elevated CO2in different depths of upper soil layers

  • Author(s): Yu, H
  • He, Z
  • Wang, A
  • Xie, J
  • Wu, L
  • Van Nostrand, JD
  • Jin, D
  • Shao, Z
  • Schadt, CW
  • Zhou, J
  • Deng, Y
  • et al.
Abstract

© 2017 American Society for Microbiology. Numerous studies have shown that the continuous increase of atmosphere CO2concentrations may have profound effects on the forest ecosystem and its functions. However, little is known about the response of belowground soil microbial communities under elevated atmospheric CO2(eCO2) at different soil depth profiles in forest ecosystems. Here, we examined soil microbial communities at two soil depths (0 to 5 cm and 5 to 15 cm) after a 10-year eCO2exposure using a highthroughput functional gene microarray (GeoChip). The results showed that eCO2significantly shifted the compositions, including phylogenetic and functional gene structures, of soil microbial communities at both soil depths. Key functional genes, including those involved in carbon degradation and fixation, methane metabolism, denitrification, ammonification, and nitrogen fixation, were stimulated under eCO2at both soil depths, although the stimulation effect of eCO2on these functional markers was greater at the soil depth of 0 to 5 cm than of 5 to 15 cm. Moreover, a canonical correspondence analysis suggested that NO3-N, total nitrogen (TN), total carbon (TC), and leaf litter were significantly correlated with the composition of the whole microbial community. This study revealed a positive feedback of eCO2in forest soil microbial communities, which may provide new insight for a further understanding of forest ecosystem responses to global CO2increases.

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