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《Chinese Journal of Grassland》 2017-02
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Effects of Seasonal Grazing on Turnover of Carbon and Nitrogen in Soil Microorganism in Semi-arid Typical Grassland

FENG Xiang-chao;ZHANG Lu;LI Ya-ru;BAI Sala;BAOYIN Taogetao;College of Ecology and Environment,Inner Mongolian University;  
The effects of moderate grazing in different plants growth stages from May to September in Xilingol steppe zone on turnover of carbon and nitrogen in soil microorganism were studied based on grazing stubble 6cm to terminate grazing.The results showed that:1)Compared with enclosure and grazing from May to September,grazing in June and August can improve the carbon turnover rate of soil microbial biomass in soil in 0-10 cm depth and shorten the turnover time of carbon turnover of soil microbial biomass.However,the soil microbial biomass carbon turnover time can only be reduced in 0-30 cm depth.2)The soil microbial biomass carbon in June,August,July,September showed differences in soil in 0-30 cm depth,enclosure increased the flux rates of soil microbial biomass carbon.It was concluded that moderate grazing can increase soil microbial biomass in middle and late growth season compared with whole stages of plants,nevertheless,fluxes of soil microbial biomass nitrogen showed that grazing had a positive influence on it in soil in depth of 10-20 cm.3)The three grazing treatments increased the flux rate of soil microbial biomass nitrogen in soil in depth of 10-20 cm.
【Fund】: 国家科技支撑(2013BAC09B03);; 国家重点基础研究发展计划(973计划)项目(2014CB138805);; 内蒙古自然基金重大项目(2015ZD05)
【CateGory Index】: S812.2
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