宁夏贺兰山自然保护区岩羊种群数量变化调查

Survey on quantity changes of blue sheep population in Helanshan nature preserve of Ningxia

通过1999年和2001年对宁夏贺兰山自然保护区岩羊种群数量的调查,结合前人1997 年和1983年所做的工作,认为贺兰山岩羊的数量呈持续增长势头．由于保护工作的开展,人类在低山地区的活动的减少为岩羊腾出大量空间,这是岩羊数量增长的主要原因;数量调查各样带记录差异明显,0样线分别占44．1％和63．5％说明保护区内的岩羊分布并不均匀,生境已呈破碎化,部分生境的植被因干旱及岩羊过度啃食出现严重退化;尽管1997年以来,岩羊的年增长低于1983-1997年间平均年增长的水平,但仍为一个不可忽视的数字,并已经影响到植被的恢复和其它野生动物的发展．建议在岩羊密度较大的地段有计划的进行人工淘汰,以调节岩羊对环境造成的压力．

The authors deem that the quantity of Blue sheep have increasing trend in Helanshan nature preserve by investigated of 1999 and 2001 and with refer to similar studied that person referred to above in 1983 and 1997 in Helanshan nature preserve; The protecting work progressive and human decrease active cause blue sheep increase; Because the survey results about each sample lines are very difference （zero sample lines proportion are 44. 1% ＆ 63. 5% each other） to prove no welldistributed about blue sheep and habitat was fragmentated, the condition was affected vegetation to recover and other animals grow. The treatise suggesting eliminate some blue sheep in high density area sector in order to adjust environment pressure originate from blue sheep.