大气CO_2增加对土壤脲酶、磷酸酶活性的影响

The response of soil urease and phosphatase activities at different rice growth stages to free air CO 2 enrichment (FACE) was studied. The results showed that comparing with the ambient atmospheric CO 2 concentration (370μmol·mol~ -1), FACE (570μmol·mol~ -1) significantly increased the urease activity of 0～5cm soil layer at the vigorous growth stage of rice, whole that of 5～10cm layer had no significant change during the whole growing season. Phosphatase activity of 0～5cm and 5～10cm soil layers significantly increased, and the peak increment was at the vigorous growth stage of rice.