[Responses of subalpine Betula albo-sinensis soil invertase activity to elevated atmospheric temperature and CO2 concentration in Western Sichuan].

Taking the soil planted with subalpine Betula albo-sinensis seedlings in Western Sichuan as test object, this paper studied the responses of its invertase activity to elevated temperature (ET), elevated atmospheric CO2 concentration (EC), and their combination (ETC). The results indicated that ET increased the soil invertase activity to a certain extent, being significant in May, June, September and October. EC also had a significant positive effect on the enzyme activity from May to October (P < 0.05), which was higher in rhizosphere than in non-rhizosphere soil, and in those planted with high density B. albo-sinensis. The responses of soil invertase activity to ETC and shading differed with month, planting density of B. albo-sinensis, and distribution pattern of the enzyme.