生物多样性

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青海湖东-克图地区普氏原羚生境适宜性评价

王秀磊1,李迪强1*,吴波2,杨洪晓3   

  1. 1 (中国林业科学研究院森林生态环境与保护研究所, 北京 100091)
    2 (中国林业科学研究院林业研究所, 北京 100091)
    3 (北京师范大学生命科学学院, 北京 100875)
  • 收稿日期:2005-01-17 修回日期:2005-04-27 出版日期:2005-05-20 发布日期:2005-05-20
  • 通讯作者: 李迪强

Habitat suitability assessment of Przewalski’s gazelle in the Hudong- Ketu area, Qinghai, China

Xiulei Wang1, Diqiang Li1*, Bo Wu2, Hongxiao Yang3   

  1. 1 Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Beijing 100091
    2 Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091
    3 College of Life Sciences, Beijing Normal University, Beijing 100875
  • Received:2005-01-17 Revised:2005-04-27 Online:2005-05-20 Published:2005-05-20
  • Contact: Diqiang Li

摘要:

普氏原羚(Procapra przewalskii)是我国特有珍稀濒危动物, 历史上曾分布于我国的内蒙古、甘肃、宁夏和青海等地, 现仅分布在青海湖周边地区。作者通过2002-2004年不同季节的实地调查, 在地理信息系统(GIS)的支持下, 以可食植物丰富度、坡度、隐蔽条件和人类活动等为评价因子, 采用生境评价模型, 对普氏原羚的主要分布区之一青海湖东-克图地区进行了适宜性评价。评价结果表明, 不考虑人类活动影响时普氏原羚的适宜和次适宜生境面积分别为2493.76 hm2和18 624.06 hm2, 分别占研究区总面积的8.05%和60.15%; 考虑人类活动影响时, 普氏原羚的适宜和次适宜生境面积分别减少了5.81%和33.09%, 而不适宜生境面积增加了38.90%。由于普氏原羚的生境受到居民地、道路、围栏等人类活动的强烈影响, 导致大量适宜生境丧失, 生境隔离和破碎化日益加剧, 建议重新规划保护区, 将普氏原羚的适宜生境划入保护区的核心区; 建立生境廊道, 拆除部分围栏, 以提高普氏原羚的生境质量, 促进其种群的发展。

Abstract

Przewalski’s gazelle (Procapra przewalskii), a rare, endangered and endemic animal in China, was once distributed in Inner Mongolia, Gansu, Ningxia and Qinghai. The distribution of the gazelles is now restricted to the region around Qinghai Lake. Based on field investigations in different seasons from 2002 to 2004, we assessed habitat suitability of Przewalski’s gazelle in the Hudong-Ketu region, a key distribution area of the gazelles. Food richness, slope aspect, shelter condition and human activities were selected as factors for habitat suitability assessment, and the habitat evaluation procedure for the assessment was conducted by GIS. The result showed that, in the absence of human activities, the area of less suitable and suitable habitats were 2493.76 hm2 and 18 624.06 hm2, accounting for 8.05% and 60.15% of the total area investigated, respectively. In the presence of impacts of human activities, less suitable habitat and suitable habitat decreased by 33.09% and 5.81%, respectively, while the area of unsuitable habitat increased by 38.90%. Because residential areas, roads and pasture fences have a strong impact on the habitat of the gazelles, Przewalski’s gazelles are confronted with habitat loss, iso-lation and fragmentation. The suitable habitat of the Przewalski’s gazelle is not included in the core zone of the Qinghai Lake National Nature Reserve. We suggest adjusting the present nature reserve and establishing a habitat corridor by removing fences in some key areas to protect the habitat and to accel-erate population growth of the gazelle.