科尔沁沙质放牧草地土壤动物多样性特征研究

在科尔沁沙质放牧草地,人为的小面积实验放牧情况下,土壤动物群落结构随放牧强度的提高发生变化,主要体现在动物密度降低、群落丰富度减小。放牧强度提高时,土壤动物生物量、密度季节动态和多样性指数无明显变化规律,重度放牧下以上指标并不明显低于封育区。土壤动物优势类群对放牧扰动的响应各自不同。以相似性指数比较土壤动物对不同牧压的响应,结果为中度放牧区较接近封育区,而重牧区分异最大。

Study on Soil Animal Diversity under Grazing in Horqin Sandy Pasture,Inner Mongolia

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.