Comparison of CO_2 net exchange between different plant communities in typical steppe of Inner Mongolia Plateau

摘要

To measure the carbon exchange of two different plant communities in typical steppe, we used dynamic chamber method improved from static chamber method, and compared it with the regional eddy-covariance method. Results showed that: 1) Biomass of plant community with enclosed restoration was higher than that with free grazing; 2) After 6 years enclosed restoration, the plant community had become a CO_2 sink though the region was still a CO_2 source while the free grazing plant community had turned into a CO_2 source in contrast with its regional CO_2 sink, and 3) Net ecosystem exchange (NEE) of enclosed restoration plant community was significantly higher than that of typical steppe.