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 soi...
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.
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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제안 방법
In this review, we aim to summarize and synthesize the results from studies assessing impacts of elevated CO2 on soil ecosystems, focusing primarily on plants and a variety of microbial processes. The processes considered include changes in microbial biomass of C and N, soil enzyme activity, microbial community composition, organic matter decomposition, and functional groups of bacteria mediating trace gas emission in terrestrial and wetland ecosystems.
성능/효과
(1996) reported that dehydrogenase, cellulose, phosphatase, and xylanase were increased by elevated CO2 in the root region of soil from monocultures of Bromus madritensis, a common and sometimes dominant annual grass in Mediterranean model ecosystem. Of the four enzymes examined, dehydrogenase and xylanase activities were significantly higher in soils under elevated CO2 than in ambient. Moorhead and Linkins (1997) suggested that elevated CO2 altered the soil enzyme characteristics in a tussock tundra ecosystem.
후속연구
An improved understanding of microbial responses to elevated CO2 could be obtained in further studies. For example, recent techniques such as micro-arrays and other molecular tools could be applied more effectively to this field.
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