呼伦贝尔草原沙狐洞穴的结构

沙狐（Vulpes corsac）又名东沙狐，属食肉目犬科，主要分布在亚洲中部的草原、荒漠和半荒漠地带，在我国主要分布在内蒙古、甘肃、宁夏和新疆部分地区。由于沙狐主要以鼠类为食，因此沙狐在调节鼠类数量和控制鼠害方面起着重要的作用（马逸清等，1986）。《中国物种红色名录》（汪松和解焱，2004）将沙狐列为“易危”，指出其“数据缺乏”。

The structure of corsac fox'dens in Hulunbeier grassland

At present it is lack of the ecological data about corsac forx (Vulpes corsac) in China. Nine non-breeding corsac fox'dens were dug and measured in Hulunbeier grassland in Inner Mongolia,of which six have one tunnel and one entrance for their own and another three have two tunnels and two entrances for each. The mean width of den entrance is 27. 3 cm and the mean height of entrance is 22.7 cm. The mean length of the dens is 207.3 cm and the mean distance is 54.7 cm from the ground to the deepest point of the dens. Although corsac fox used to expand rodent’s dens as its own dens,which is the main source of the dens,sometimes it digs dens by itself too. Corsac fox'dens are very narrow and long corresponding with its stature. In the measured twelve dens'tunnels,there are nine with a bend. Corsac fox' dens are generally distributed in open grasslands,riverine gentle incline or steep hills.