Title Effects of Elevated Atmospheric CO_2 Concentrations on Soil Microorganisms
Author Chris Freeman, Seon-Young Kim1, Seung-Hoon Lee1, and Hojeong Kang1
Address School of Biological Sciences, University of Wales, Bangor, LL57 2UW, UK, 1Department of Environmental Science and Engineering, Ewha Womans University, Seoul 120-750, Republic of Korea
Bibliography Journal of Microbiology, 42(4),267-277, 2004,
Key Words elevated CO_2, microbial process, trace gas emission, soil enzyme activity, microbial community structure
Abstract Effects of elevated CO_2 on soil microorganisms are known to be mediated by various interactions with plants, for which such effects are relatively poorly documented. In this review, we summarize and synthesize results from studies assessing impacts of elevated CO_2 on soil ecosystems, focusing primarily on plants and a variety the of microbial processes. The processes considered include changes in microbial biomass of C and N, microbial number, respiration rates, organic matter decomposition, soil enzyme activities, microbial community composition, and functional groups of bacteria mediating trace gas emission such as methane and nitrous oxide. Elevated CO_2 in atmosphere may enhance certain microbial processes such as CH_4 emission from wetlands due to enhanced carbon supply from plants. However, responses of extracellular enzyme activities and microbial community structure are still controversy, because interferences with other factors such as the types of plants, nutrient availabilitial in soil, soil types, analysis methods, and types of CO_2 fumigation systems are not fully understood.
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