Abstract:

To know the effects of climate change on the soil organic carbon and total nitrogen content, the field controlling experiments of temperature and precipitation manipulation were constructed to analyze the responses of soil C or N, and microbial biomass C or N under alpine meadow to change of temperature and precipitation. The results showed that the change of precipitation would not cause a reducing in soil organic carbon (SOC) content under alpine meadows significantly (P>0.05), while increasing temperature and no changing precipitation would cause decreasing in SOC content at surface soil layer, while increasing temperature and reducing precipitation would cause an increasing in total soil nitrogen content at deep soil layer, while increasing temperature and precipitation would cause a decreasing in total soil nitrogen content. Additionally, the change of precipitation or temperature would not cause a reducing of soil microbial biomass C or N content under alpine meadows significantly, while increasing temperature and reducing precipitation would cause total soil microbial biomass C ratio increasing, and increasing or decreasing precipitation would cause soil microbial biomass N ratio at soil layer increasing. The results indicated that the responses of soil C and N, microbial biomass C or N under alpine meadow to the change of temperature and precipitation were influenced by interaction between temperature and precipitation change or soil depth, and the effects of changing in temperature and soil water was not significantly.