Abstract: In this study, Pinus koraiensis seedlings were grown under elevated CO₂ (500 and 700 μmol·mol^-1), and the hydrolase activities in 0～10 cm soil layer were determined. The results showed that compared with those under ambient condition, the activities of soil protease, urease, amylase and phosphatase under elevated CO₂ increased significantly, while invertase activity decreased significantly. Different concentration of elevated CO₂ had different effects on soil hydrolase activities. 500 μmol CO₂·mol^-1 had more significant effect on soil protease and phosphatase activities, while 700 μmol CO₂·mol^-1 had more significant effect on soil urease, amylase, and invertase activities.

Key words: Fenpropathrin, Phoxim, Mixture of pesticides, Soil microbe, Degradation