Carbon Dynamics in Submerged Soil Microcosms as Influenced by Elevated CO_2 and Temperature

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A 45-d incubation experiment was conducted Under controlled laboratory conditions to study the interactive effects of elevated CO_2 and temperature on the dynamics of microbial biomass C and organic C in flooded paddy soil microcosms amended or unamended with rice straw. The microcosms with the two treatments were transferred separately to four growth chambers to incubate them under 16 h/8 h light and dark conditions. Two of the growth chambers set at 25 and 35℃ provided a continuous flow of elevated CO_2 (equivalent to 800 μL L^<-1>). Similarly the other two growth chambers were run under near ambient CO_2 (400μL L^<-1>) conditions at each of the two temperatures. The amounts of soluble carbon, microbial biomass C, chlorophyll-type compounds, and organic C in the surface (0-1 cm) and sub-surface (below 1 cm) soil layers were measured at 15, 30, and 45 d after incubation. The amount of soluble carbon in the straw-amended soil gradually decreased throughout the incubation period, while no significant differences were detected among the four different conditions. The interactive effects of both elevated CO_2 and temperature were found to be positive in terms of the size of the microbial biomass in surface soil, although no significant differences were detected in the sub-surface. However, the amount of total soil organic C was larger in the soils incubated at a lower temperature. The amounts of chlorophyll-type compounds doubled in the surface soil when the soils were incubated under elevated CO_2 conditions, indicating that the higher incubation concentration of CO_2 promoted the growth of algae in surface soil.
社団法人日本土壌肥料学会の論文

Carbon Dynamics in Submerged Soil Microcosms as Influenced by Elevated CO_2 and Temperature

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