THE QUANTITY DISPOSITION OF RODENTS IN ABONDANT FIELD AND ITS EFFECTS ON VEGETATION SUCCESSION IN ALPINE MEADOW
XIAO Yunfeng LIANG Jicrong SHA Qu ( Northwest Plateau Institute of Biology, Academia Sinica )
1. This work was carried out in the alpine meadow region, Menyuan, Qinghai, from August to September 1974. 2. Series of vegetation succession in abondant field are:Secondary barela-nd stages→annual and biannual herbosa stages→rhizome and stobon herbosa stages→loose grass stages→crowded grass stages. 3. The quantity of the plateau pika on all succession stages increases with the increase of the quantity of the grass; the quantity of the common chenesc zokor decreases with the decrease of rhizome and stolon herbosa. 4. The degeneration of vegetation is not only related to rodents pest but also is caused by intensive pasturage.