放牧影响下科尔沁沙质草地蛴螬群落特征的分异研究

The Effects of Grazing Activity on Scaraeoridea Larvea Community in Horqin Sandy Land

在中科院奈曼沙漠化研究站的放牧试验样地中 ,于放牧试验结束后的恢复期 ,研究了土壤动物优势类群蛴螬群落对放牧的反应 .结果表明 ,停止放牧后经两年的恢复 ,不同放牧强度下蛴螬群落的个体数量、生物量、物种多样性等指数大多表现为中轻度放牧强度下较高 ;重度放牧强度下 ,以上指数均较低 .蛴螬群落主要种群在放牧强度等级上生态位大多较窄 ,仅东方绢金龟有较宽的生态位 .蛴螬群落种群间的生态位重叠除东方绢金龟和毛缺鳃金龟外 ,均很小 .东方绢金龟较为耐放牧扰动 ,而蛴螬群落整体对放牧比较敏感 .

After grazing expriment two years,we studied the changes of Scaraeoridea Larvea community under the condition of grazing pressures increasing in Horqin sandy land.The following points of views can be concluded.At the sites of lightly grazing and mideratly grazing,the individual number,spices,biomass and biodiversities indexes of Scaraeoridea Larvea are higher than that in control site and heavily grazing.Except Serica orientalis Motschulsky,they all had relatively narrow niche breadth.And the niche overlaps between the species of Scaraeoridea Larvea are less.For the disturbance of grazing activity, Serica orientalis Motschulsky is relatively unsensitive.But the community of Scaraeoridea Larvea is sensitive.