草业学报2012，Vol.21Issue(2)：219-226,8.
甘肃尕海湿地不同海拔草地群落组分及物种多样性研究
Study on grassland community characteristics and species diversity along altitudinal gradients in the Gahai wetland, Gansu province
摘要
Abstract
To explore the responses of grassland community characteristics and species diversity to the altitudi-nal gradient and human activities,the species composition and plant life form of grassland community along al-titudinal gradients from 3 485 to 3 650 m in the west-wing area of Gahai Lake,Gansu province,located in the eastern region of Qihai-Tibet Plateau,were investigated.The data showed that 59 species were found in this region,which belongs to 20 families and 46 genera.Most distribution type of these genera is the temperate,and the majority of these species are the perennial and non-leguminous nitrogen-fixing plants.The six grassland community types were classified along the aititudinal gradients,namely Poa annua -Anemone obtusiloba com-munity,Potentilla plumose -Plantago depressa community,Stipa purpurea community,Poa annua-Koele-ria cristata community,Poa annua-Kobresia myosuroides community,and Kobresia myosuroides - Cyperus community.The dominant species in the natural grassland are mostly consist of Gramineae and Cyperaceae families,while the species were replaced by the Potentilla plumose -Plantago depressa and Stipa purpurea in the human strongly active area,and herein human activities strongly influence the grassland community characteristics.In addition,the negative relationships between altitude and indexes of species diversity (such as,species abundance,species density,similarity index,and the number of common species) were also found.Obviously,both altitude and human activities strongly affect the community characteristics and diversity of the alpine grassland,even the human activities are more pronounced.Therefore,in order to sustain the species diversity and ensure sustainable development of alpine grassland,we should take the reasonable and effective protection and minimize the impact of human activities.关键词
尕海湿地/海拔梯度/人类活动/群落类型/物种多样性Key words
Gahai wetland/aititudinal gradients/human activities/community type/species diversity分类
农业科技引用本文复制引用
徐鹏彬,邓建明,赵长明..甘肃尕海湿地不同海拔草地群落组分及物种多样性研究[J].草业学报,2012,21(2):219-226,8.基金项目
教育部新世纪优秀人才支持计划(NCET-08-0257)和兰州大学中央高校基本科研业务费专项资金(lzujbky-2012-k20和lzujbky2010-47)资助. （NCET-08-0257）
