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http://dx.doi.org/10.5141/JEFB.2010.33.3.261

Effects of elevated CO2 on organic matter decomposition capacities and community structure of sulfate-reducing bacteria in salt marsh sediment  

Jung, Soo-Hyun (Department of Environmental Engineering and Science, Ewha Womans University)
Lee, Seung-Hoon (School of Civil and Environmental Engineering, Yonsei University)
Park, Seok-Soon (Department of Environmental Engineering and Science, Ewha Womans University)
Kang, Ho-Jeong (School of Civil and Environmental Engineering, Yonsei University)
Publication Information
Journal of Ecology and Environment / v.33, no.3, 2010 , pp. 261-270 More about this Journal
Abstract
Increasing atmospheric $CO_2$ affects the soil carbon cycle by influencing microbial activity and the carbon pool. In this study, the effects of elevated $CO_2$ on extracellular enzyme activities (EEA; ${\beta}$-glucosidase, N-acetylglucosaminidase, aminopeptidase) in salt marsh sediment vegetated with Suaeda japonica were assessed under ambient atmospheric $CO_2$ concentration (380 ppm) or elevated $CO_2$ concentration (760 ppm) conditions. Additionally, the community structure of sulfate-reducing bacteria (SRB) was analyzed via terminal restriction fragments length polymorphism (T-RFLP). Sediment with S. japonica samples were collected from the Hwangsando intertidal flat in May 2005, and placed in small pots (diameter 6 cm, height 10 cm). The pots were incubated for 60 days in a growth chamber under two different $CO_2$ concentration conditions. Sediment samples for all measurements were subdivided into two parts: surface (0-2 cm) and rhizome (4-6 cm) soils. No significant differences were detected in EEA with different $CO_2$ treatments in the surface and rhizome soils. However, the ratio of ${\beta}$-glucosidase activity to N-acetylglucosaminidase activity in rhizome soil was significantly lower (P < 0.01) at 760 ppm $CO_2$ than at 380 ppm $CO_2$, thereby suggesting that the contribution of fungi to the decomposition of soil organic matter might in some cases prove larger than that of bacteria. Community structures of SRB were separated according to different $CO_2$ treatments, suggesting that elevated $CO_2$ may affect the carbon and sulfur cycle in salt marshes.
Keywords
extracellular enzyme activity; salt marsh sediment; sulfate reducing bacteria; T-RFLP;
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