Effects of Elevated CO2 Concentration on Soil Microbial Functional Diversity and Carbon Source Utilization Characteristics in the Root Zone of Lycium barbarum

【Objective】This paper studied the differences in the functional diversity and carbon source utilization characteristics of soil microorganisms in the root zone of Lycium barbarum,by which determined the effects of doubled CO2 concentration on the functional diversity of soil microorganisms in the root area of L. barbarum,so as to provide theoretical basis for sustainable management of L. barbarum. 【Method】In this study,the cuttings of L. barbarum（ wolfberry） were used as materials. An open-top chamber（ OTC） was used to set three CO2 concentration gradients of atmospheric CO2 concentration( CK,400±20 μmol·mol-1),and 1. 5-time atmospheric CO2 concentration( TR1,600±20 μmol·mol-1),and 2-time atmospheric CO2 concentration（ TR2,800 ± 20 μmol·mol-1）. The wolfberry saplings were subjected to the different CO2 concentrations. Soil samples were collected from the root zone at 30,60,90,and 120 days after treatment and analyzed by BIO-ECO technology for the functional diversity of soil microbial communities and the char