牛背梁自然保护区羚牛的分布与数量

1998 年1～4 月对牛背梁国家级自然保护区内羚牛种群数量与分布做了调查, 结果表明, 保护区内有11 群羚牛, 总数量119～130 头(包括独牛) , 整个保护区内羚牛分布密度为0.007 3～0.007 9 头/ hm² 。在冬季, 羚牛分布于海拔1 900～2 700 m的5 块相互隔离的栖息地中, 以海拔2 200～2 600 m之间分布更为集中。在1981～1998 年的17 年间, 保护区内的羚牛种群分布范围在逐渐缩小; 从上世纪50 年代至90 年代, 羚牛最低的分布高度比历史分布高度至少上升了400 m。周边地区人为干扰、生境不断丧失和保护区内生境破碎化是导致羚牛分布现状最直接的原因。

DISTRIBUTION AND POPULATION SIZE OF GOLDEN TAKIN IN NIUBEILIANG NATURE RESERVE OF SHAANXI

The distribution and population size of golden takin ( Budorcas taxicolor bedfordi ) were surveyed at the Niubeiliang National Nature Reserve, Shaanxi Province in January-April of 1998 The population size was estimated to be 119-130 individuals including solitary takins, and they were distributed in the elevation range of 1 900 to 2 700 m,among 5 separate winter habitats They were mainly congregated at altitude between 2 200 - 2 600 m Besides a few solitary takins, most of the animals were found in 11 herds The density was 0 007 3-0 007 9 head/hm 2 at the reserve The distribution range of golden takins was dwindled between 1981-1998,and their lowest distribution elevation of takins was 400 m higher than the historical records The direct reasons were the human disturbance of the surrounding areas, continual lost of their habitats, and the ecological environment in the nature reserve was destroyed.