Abstract: The distribution of glomalin-related soil protein (GRSP) and the relationship between GRSP and environmental factors in a semiarid area in northeast Inner Mongolia were investigated in this study.The averages of EE-GRSP and T-GRSP contents were 0.79 mg•g^-1 and 1.44 mg•g^-1,accounting for 6.83% and 12.86% of average organic carbon contents,respectively,and their percentages were decreased with the increase of organic carbon content.The content of GRSP was different from different areas,for example,the GRSP of soil in Hailar area was significantly higher than that in Xilinhot area.The correlation analysis of GRSP indicates that there were the significant positive correlations between GRSP and carbon and nitrogen contents and C/N ratio,but the significant negative ones between unit weight,pH value and annual mean temperature.In addition,the GRSP accumulation could be increased by properly increasing soil clay content in semiarid area.It is suggested to increase the soil GRSP content by inoculating AM fungi so as to improve soil and increase soil organic carbon pool,which is of important theoretical and practical significance to regenerate the ecology and environment in fragile area.  

Key words: glomalin-related soil protein, soil factor, climatic factor, organic carbon, AM, Inner Mongoli