Acta Agrestia Sinica

›› 2008, Vol. 16 ›› Issue (5): 475-479.DOI: 10.11733/j.issn.1007-0435.2008.05.009

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Biomass Distribution Characteristics of Alpine Meadow under Different Burrowing Plateau Pika Density in Guoluo Region,Qinghai Province

SUN Fei-da1, LONG Rui-jun2,3, JIANG Wen-lan1, LU Cheng-xiang4   

  1. 1. Pratacultural College, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China;
    2. College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou, Gansu Province 730020, China;
    3. Northwest Institute of Plateau Biology, Chinese Academy of Science, Xining, Qinghai Province 810002, China;
    4. College of Forestry, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China
  • Received:2007-12-17 Revised:2008-03-28 Online:2008-10-15 Published:2008-10-15

青海果洛地区不同鼠洞密度下高寒草甸植物生物量分布特征

孙飞达1, 龙瑞军2,3, 蒋文兰1, 路承香4   

  1. 1. 甘肃农业大学草业学院, 甘肃, 兰州, 730070;
    2. 兰州大学草地农业科技学院, 甘肃, 兰州, 730020;
    3. 中国科学院西北高原生物研究所, 青海, 西宁, 810002;
    4. 甘肃农业大学林学院, 甘肃, 兰州, 730070
  • 通讯作者: 龙瑞军,E-mail:longrj@lzu.edu.cn
  • 作者简介:孙飞达(1978- ),男,甘肃靖远人,博士研究生,研究方向为草地生态学,E-mail:sunfd08@163.com
  • 基金资助:
    国家自然基金重点项目(30730069);国家自然基金面上项目(30600426)

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Abstract: The activity of plateau pika has either harmful or beneficial effects to the alpine meadow ecosystem and the transformation between both sides is determined by the population density of plateau pika.In order to study the effect of plateau pike activities under different population densities on the biomass of alpine meadow,the effects of burrow densities were investigated on the aboveground,underground,and total biomass of alpine meadow in Guoluo Region,an important source region of Yangtze and Yellow rivers in Qinghai Province.The results show that,with the burrowing plateau pika density increasing,the aboveground,underground,and total biomass changed in a ‘V’ trend,i.e.declined sharply at first and then rose slowly,which could be simulated by y=ax2+bx+c.The biomass of plot I(3 burrows in 25 m×25 m) was the largest and plot IV(54 burrows in 25 m×25 m) was least,and the plot V(8 burrows in 25m×25m) had highest burrow density but the biomass was not the minimum.The underground biomass was mainly distributed at soil depth of 0 to 10cm and prone to congregate in soil surface layer,especially during the active growing period.Regarding the dynamics of community components,the sedges and grasses decreased but the forbs increased consistent with the increasing of burrow density.

Key words: Burrow density of plateau pika, Alpine meadow, Plant biomass, Distribution characteristics

摘要： 为探讨不同密度下的鼠类活动对高寒草甸植物生物量的影响,本研究以高原鼠兔(Ochotona curzoniae)的有效鼠洞作为调查对象,分析了不同鼠洞密度对黄河源区青海果洛高寒草甸植物地上、地下和总生物量的影响。结果表明:随着草地鼠洞密度的增大,植物地上、地下和总生物量呈"V"字型变化趋势,先急剧下降后缓慢上升,满足y=ax2+bx+c关系;其中样地Ⅰ(3个/25 m×25 m)生物量最大,样地Ⅳ(54个/25 m×25 m)最小,样地Ⅴ(85个/25 m×25 m)鼠洞密度较大,而生物量并不是最小值;植物地下生物量主要分布在0~10 cm的范围内,随着鼠洞密度的增大有向表层聚集的趋势,生长旺盛期更为明显。植物群落组成中,随着鼠洞密度增大,莎草类和禾草类地上生物量均呈现下降趋势,而杂类草则趋于增加。

关键词: 鼠洞密度, 高寒草甸, 植物生物量, 分布特征

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