摘要
20 0 2年 9月 ,采用样方法和挖掘法分别对分布在若尔盖草原荒漠 (东经 10 2°2 9′0 4 1″,北纬 33°4 3′2 5 0″ ,海拔 346 4m)上的青海沙蜥 (Phrynocephalusvlangalii)的洞穴密度及深度进行了研究。结果表明 :①青海沙蜥的洞穴密度随植被盖度的升高而下降 (r =- 0 81,P <0 0 1) ,这说明青海沙蜥的生境选择是偏向于植被盖度较低的荒漠 ,因此可以把该物种作为草地荒漠化的一种指示生物。②青海沙蜥居住洞穴深度大于 74cm ,在冻土层之下。青海沙蜥选择深度达到最大冻土之下的洞穴居住是它抵御低温的一种行为机制 ,而深度小于 74cm的洞穴则可能是用于逃避敌害的临时隐蔽所。
We measured the density of the burrows of Phrynocephalus vlangalii at the Zoigê Wetland at elevation about,NW Sichuan,by the quadrate method,and the depth by digging and using a blanch of alpine willows in September 2002.The density of P.vlangalii burrows declined with the plant coverage (r=-0.81,P<0.01),P.vlangalii shows preference to the desert with low plant coverage and could be used as one of indicator species for desertification of grassland.The depth of dwelling burrows was ≥74 cm,which is beyond the layer of frozen earth,living in these burrows is a behavioral mechanism of P.vlangalii to protect themselves from extreme low temperature,and the burrows with depth <74 cm may be used only for avoiding predation during foraging.
基金
中国科学院知识创新工程项目 (KSCX2 -1-0 6A)
国家教育部湿地研究专项基金资助项目
关键词
青海沙蜥
洞穴密度
洞穴深度
最大冻土深
生境选择
Phrynocephalus vlangalii
Burrow density
Burrow depth
Maximum frozen earth depth
Habitat use
