内蒙古典型草原蛴螬群落对放牧强度变化的响应研究

The Effects of Grazing Pressures on Scarabaeoidae Larvae Community in NeiMongol Typical Steppe

在长期的放牧演替过程中,大针茅草原和羊草草原蛴螬群落的优势种组成无明显变化,即东方绢金龟和弓斑常丽金龟为优势种.明显的变化表现为优势种群优势度的波动、以及常见种的增减.不同放牧强度下,蛴螬群落之间的相似性指数均较低.比较而言,中轻度放牧强度下蛴螬群落之间的相似性是最高的.放牧强度提高时,群落多样性各指数呈下降趋势.总体上,中轻度放牧压力下蛴螬群落各指数的组合显得较为合理.因此,在内蒙古典型草原的管理和利用中,中轻度放牧强度是可取的.

The changing of Scarabaeoidae Larvae community construction was studied in NeiMongol typical steppe.In a long term grazing disturbance,the dominant groups of Scarabaeoidae Larvae community change unobviously under the different grazing pressures,they are Serica orientalis Motrchlsky and Cyriopertha arcuata (Gebler).The main effects of grazing on the Scarabaeoidae Larvae community are the fluctuation of the main groups′ superiority and the number of common species.Under the mediate and light grazing pressures,the similarity indexes of Scarabaeoidae Larvae community are higher than that under the other grazing pressures.As the grazing pressures in creasing,the biodiversity indexes of Scarabaeoidae Larvae community decrease. For management and using of NeiMongol grassland,the mediate and light grazing pressures are reasonable.