关键词: 高原鼢鼠, 植物生物量, 挖掘, 觅食, 高寒草甸

Abstract: The research work was conducted in alpine meadow north of Qinghai Province in 1998. We mainly explored the plant biomass which roots had been impaired by excavation of plateau zokor. The results showed that the above and belowground biomasses of dicotyledons were obviously decreased at first colonizing , and the biomasses of monocotyledons over burrows in which the excavated soil was backfilled was significantly increased in primary vegetation. In contrast , both the above and belowground biomass were significantly decreased in the area that soil layer thickness is 3 -5 cm only over burrows in which have been used continually in all season. However , there were not statistically distinct effects on the overlying vegetation where the burrows were under 10 cm in the same vegetation area. But whatever above and belowground biomass greatly decreased in the overlying vegetation of burrows where plateau zokors colonized over 10 years in which the vegetation was obviously different with surrounding environment. The results indicated the hypothesis that the excavation under ground by plateau zokor caused negative effect for the dicotyledons of taproots , but could promote the growth and development of the monocotyledons to some extent was correct.

Key words: Plateau zokor (Myospalax baileyi), Excavation, Plant biomass, Alpine meadow