关键词: 科尔沁沙地, 土壤动物多样性, 放牧

Abstract: The study about the effects of different grazing pressures on soil animal community in Horqin sandy pasture,Inner Mongolia has got some results as follows:① As the grazing pressure increases,the communities of soil animal change.And the main changes are that the density and richness of soil animal community are both decreasing.② Under the different grazing pressures,the soil animal biomass,seasonal dynamic,and index es of diversity don't change obviously.Under the heavy grazing pressure,the above index es of soil animal community are not lower than that under no grazing pressure.③ Under the disturbance of grazing activity,the dominant groups of soil animal have different reactions.④ Comparing the changes o f soil animal community with the relationship index show s that the communities of soil animal in moderate grazing pressure are similar to that in ungrazed site.And under the heavy grazing pressure,the communities of soil animal change greatly.

Key words: Horqin Sandland, diversity of soil animals, grazing activity