Soil biochemical characters of Pinus koraiensis and Pinus sylvestriformis plantations under different elevated CO2 concentration
不同二氧化碳浓度条件下红松和长白赤松土壤生化特性研究

The aim of this study was to determine the dynamics of soil microbial biomass C, cellulose decomposition rate and catalase activity in Pinus koraiensis and Pinus sylvestriformis plantations exposed to elevated CO2 (700 mg x L(-1) and 500 mg x L(-1)) during the growth season. The five years results indicated that in Autumn, the soil microbial biomass C of Pinus koraiensis and Pinus sylvestriformis plantations was in the order of ambient CO2-chamber > 500 mg x L(-1) CO2-chamber > 700 mg x L(-1) CO2-chamber. The monthly dynamics of cellulose decomposition rate in 5 and 10 cm depth soils showed that for both Pinus sylvestriformis and Pinus koraiensis plantations, it was always higher under 500 mg x L(-1) CO2 than under 700 mg x L(-1) CO2 in growth season. Between different CO2 concentration treatments, soil catalase activity of Pinus koraiensis and Pinus sylvestriformis plantations displayed a definite pattern of its monthly dynamics.