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Sui X.,Heilongjiang Academy of Science | Sui X.,National and Provincial Joint Engineering Laboratory of Wetlands and Ecological Conservation | Sui X.,Key Laboratory for Wetland and Restoration Ecology in Heilongjiang Province | Sui X.,Northeast Forestry University | And 13 more authors.
Journal of Residuals Science and Technology | Year: 2015

In this study, we studied the effects of different Carbon dioxide concentrations on microbial community diversity in a wetland ecosystem in northern China. The open-top chamber (OTC) was situated in the boggy soil in which the dominant plant is Deyeuxia angustifolia. Between 2010 and 2013, we maintained the average Carbon dioxide concentration in OTC at 370 ppm, 550 ppm and 700 ppm. Soil samples were collected during the last year. Results show that soil fungal diversity indices in the 0–10 cm soil layer were significantly decreased by elevated concentration of CO2 by 4.570 in ck. It was increased by 4.456, 4.373 and 4.13 by 350 ppm, 500 ppm and 700 ppm CO2, respectively. Soil bacterial diversity indices in the 0–10 cm soil layer, however, were not significantly influenced by elevated CO2 (P > 0.05). The results of principal component analysis (PCA) and Redundancy analysis (RDA) indicate that elevated CO2 had no strict specificity with bacterial community diversity but strict specificity with fungal community, while environmental condition had great influence on fungal community diversity and soil nutrient. Organic carbon, nitrate nitrogen (NO-N), C/N, total nitrogen (N) and pH were the primary impact factors. These results suggest that the environmental conditions exhibit great influence on the community diversity of fungi and bacteria. It is also found that soil nutrient were indicative of the change of community diversity of fungi and bacteria. © 2015 DEStech Publications, Inc.

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