草地学报 ›› 2022, Vol. 30 ›› Issue (1): 169-177.DOI: 10.11733/j.issn.1007-0435.2022.01.021

• 研究论文 • 上一篇    

东祁连山高寒草甸植被特征和生物多样性对生境的响应

李强1, 何国兴1, 刘志刚1, 关文昊1, 乔欢欢1, 张德罡1, 韩天虎2, 孙斌2, 潘冬荣2, 柳小妮1   

  1. 1. 甘肃农业大学草业学院/草业生态系统教育部重点实验室/甘肃省草业工程实验室/中-美草地畜牧业可持续发展研究中心,甘肃 兰州 730070;
    2. 甘肃省草原技术推广总站,甘肃 兰州 730000
  • 收稿日期:2021-06-28 修回日期:2021-07-29 发布日期:2022-01-27
  • 通讯作者: 柳小妮, E-mail: liuxn@gsau.edu.cn
  • 作者简介:李强(1990-),男,甘肃陇西人,博士,主要从事草地资源与生态研究,E-mail: 1245524440@qq.com
  • 基金资助:
    甘肃省新一轮草原补奖效益评估及草原生态评价研究(XZ20191225);超低空微遥感技术在草原监测中的应用研究及推广示范资助

Responses of Vegetation Characteristics and Biodiversity to habitat in Alpine Meadows in Eastern Qilian Mountains

LI Qiang1, HE Guo-xing1, LIU Zhi-gang1, GUAN Wen-hao1, QIAO Huan-huan1, ZHANG De-gang1, HAN Tian-hu2, SUN Bin2, PAN Dong-rong2, LIU Xiao-ni1   

  1. 1. College of Grassland Science, Gansu Agricultural University/Key Laboratory of Grassland Ecosystem of the Ministry of Education, Lanzhou, Gansu Province 730070, China;
    2. Grassland Technology Extension Station of Gansu Province, Lanzhou, Gansu Province 730000, China
  • Received:2021-06-28 Revised:2021-07-29 Published:2022-01-27

摘要: 为了探究海拔和坡向演变过程中高寒草甸植被的变化特征,本试验以东祁连山的高寒草甸为研究对象,采用相关性和聚类分析等方法,研究了不同海拔(2 800 m, 3 000 m, 3 200 m, 3 400 m, 3 600 m, 3 800 m和4 000 m)和坡向(阳坡、阴坡)的植被特征、功能群组成和多样性指数的变化规律。结果表明:随着海拔升高,植被盖度、草层高度、地上生物量、莎草科、豆科和杂类草地上生物量均呈先升高后降低的趋势,禾本科地上生物量降低;同一海拔,阴坡植被盖度、草层高度、地上生物量和莎草科、禾本科和豆科地上生物量均高于阳坡。Shannon-wiener指数和丰富度指数变化规律与地上生物量类似。聚类分析发现,3 000~ 3 400 m的阴坡和阳坡植被特征和生物多样性类似。综上,海拔和坡向共同影响着高寒草甸草地生产力和生物多样性,海拔3 000 m和3 400 m可以作为该区域草地围栏区块化管理的参考值,避免以山脊划分管理草场。

关键词: 东祁连山, 高寒草甸, 功能群, 植被生物多样性

Abstract: Io explore the changing characteristics of alpine meadow vegetation during the evolution of altitude and aspect, alpine meadow in Eastern Qilian Mountains was used as the research object, sampling correlation and cluster analysis methods were used to study the changes of vegetation characteristics, functional group composition and diversity index in different altitudes (2 800 m, 3 000 m, 3 200 m, 3 400 m, 3 600 m, 3 800 m and 4 000 m) and aspect (sun aspect, shady aspect). The results showed that, as the altitude increases, the total vegetation coverage, grass layer height, above-ground biomass, Cyperaceae, Leguminosae and Forks above-ground biomass showed a trend of first increasing and then decreasing, whie the above-ground biomass of Gramineae showed a decreasing trend. At the same altitude, the vegetation coverage, grass layer height, above-ground biomass, Cyperaceae, Gramineae and Leguminosae above-ground biomass of shade aspect was higher than that in sunny aspect. The changes of Shannon-wiener Index and richness index was similar to the above-ground biomass. Cluster analysis found that vegetation characteristics and biodiversity of shaded and sunny aspect of 3 000~3 400 m was similar. In conclusion, both altitude and aspect influenced the productivity and biodiversity of alpine meadows. Altitude 3 000 m and 3 400 m can be used as reference for grassland fence block management in Eastern Qilian Mountains, and avoid dividing and managing pastures by ridges.

Key words: Eastern Qilian Mountains, Alpine meadows, Functional groups, Vegetation biodiversity

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