As an important part of the ecosystem,soil microorganisms are very sensitive to temperature changes.In order to reveal the effect of climate warming on the characteristics of soil bacterial population at different altitudes(2222.4 m,2395.0 m and 2571.3 m)in Guancen Mountain,an open-top chamber(OTC)was used to simulate the warming experiment,and set up three kinds of treatments,namely,CK(control),low warming,and high warming,to study the characteristics of soil bacterial population under different warming treatments by using a culturable method,at the meantime,the physicochemical properties were measured and their correlations were analyzed.The results showed as the following four aspects.(1)Compared with the control,both warming treatments significantly increased the number of soil culturable bacteria in the three altitude samples(P＜0.05).(2)The characteristics of the changes in bacterial counts under the two warming treatments were different at different elevations,and only at 2571.3 m the high degree of warming was significantly higher than the low degree of warming(P＜0.01).(3)Longitudinally,the bacterial counts in the CK and low warming treatment samples showed a significant decreasing trend with increasing altitude(P＜0.05),while the opposite trend was observed in the high warming samples with-out reaching significant level.(4)There was a very significant positive correlation between the number of culturable bacteria and water content in the study area(P＜0.01).The results of the study provide theoretical basis and data support for regional ecosystem microbial response to climate warming.
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