Soil Microbial Characteristic and Soil Respiration in Grassland under Different Use Patterns

Effects of three different use patterns of grassland(exclosure,grazing,mowing)on soil respiration and soil microorganism were studied at the Leymus chinensis meadow steppe of Hulunber in this paper.Results were that soil respiration rate,soil microbial biomass carbon and soil enzyme activities(except urease)in enclosed grassland were higher(both contents and activities) than that in grazing and mowing grassland under different use patterns.Soil microbial biomass nitrogen,urease activity and microbial biomass were higher(both activity and quantity) under grazing and mowing patterns than under enclosed pattern.The contents of microbial biomass carbon,soil enzyme activities(except urease) and soil microbial biomass were highest in surface soil(0~10 cm) then decreased(both activity and number) in deeper soil depths.Soil respiration rate had a positive correlation with soil microbial biomass carbon and soil enzyme activity(except catalase),but a negative correlation with the soil microbial biomass nitrogen,catalase and the soil microorganism quantities.