关键词: 高原鼠免, 达乌尔鼠免, 食物资源谱, 食物利用谱, 生态位

Abstract: The sympatric coexistence of plateau pika (Ochotona curzoniae)and daurian pika (O.daurica) was found by researchers，at Niannuosoma area of Gangcha county．Qinghai province (is located 37^。10' N．99^。40'E)．
This paper presented the relationship between the niches of two spesies of the pika in common habitat，from utilization of food resources．The experiment showed the niche breadth is 0.4744 for plateau pika and 0.4964 for daurian pika，respectively (PS measurement)，in the niche dimension of the food resources．The niche overlap was the largest(0.8091，FT measurement)in the niche dimension of food resources utilization spectrum between plateau pika and daurian pika．It was provable that he interference competition had been more intensity between two species of the pikas．

Key words: Plateau pika(Ochotona curzoniae), Daurian pika(O.daurica), Niche, Food resource spectrum, Food utilization spectra