围栏封育对青海湖地区芨芨草草原群落特征的影响
Influences of Enclosure on Achnatherum splendens Steppes Community Characteristics in the Qinghai Lake Area
查看参考文献13篇
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文摘
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选择青海湖地区围栏内封育和围栏外自由放牧的芨芨草草地为研究对象，用样线和样方相结合的方法进行群落调查，分析了围栏内外芨芨草草地的群落特征和地上生物量特点。结果表明：多年围栏封育使围栏内外群落类型发生了变化，围栏内为芨芨草＋裸花碱茅群落，围栏外为芨芨草＋赖草群落，且每个小样方中的物种数围栏内大于围栏外。围栏内外芨芨草群落的相似性系数达0．743。围栏外自由放牧区域的芨芨草种群优势地位有所加强，其重要值也大于围栏内的芨芨草。物种丰富度指数围栏外大于围栏内，多样性指数中Shannon-winner指数、Hill指数和丰富度指数具有同样的趋势，而均匀度指数和Simpson指数则是围栏内大于围栏外。围栏封育后群落地上生物量发生变化，地上总生物量和禾草类生物量均为围栏内〉围栏外，而杂类草和豆类毒杂草则是围栏内〈围栏外。 |
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其他语种文摘
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The study was conducted on the sheep breeding pasture-land in the north bank of Qinghai I.ake. The Achnatherum splendens steppe of abandoned field was studied as the object. Based on the plot data, Achnatherum splendens community characteristics were analyzed by the specific composition. The richness index, biodiversity index, the evenness and characteristic of underground biomass were compared within and out of the fence. The results were as following： Many years enclosure changed the type of plant corn munity, the type of inside fence is Achnatherum splendens ＋ Puccinellia nudiflora community and the type of outside fence is Achnatherum splendens ＋ Leymus secalinus community. The number of species in the samples inside fence is higner than outside fence. Similarity indexes between Achnatherum splendens communities within and out of fence reaches 0. 743. Dominant status of Achnatherum splendens is enhanced in the outside fence community. Achnatherum splendens is the main dominant species in the inside fence community, but its importance value is lower than outside. The richness index of Achnatherum splendens community inside fence is higher than out of fence. The species diversity index（Shannon-winner index H＇, Hill index D） of change direction is accordant. The evenness index and the species diversity index（Simpson） change direction is reversed. The total aboveground biomass and grasses of aboveground biomass within fence are higher than out of fence. But aboveground biomass of forbs and legume out of fence is higher than inside fence. |
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来源
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中国草地学报
,2007,29(1):19-23 【核心库】
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关键词
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青海湖地区
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芨芨草草原
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群落特征
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围栏封育
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物种多样性
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地址
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中国科学院西北高原生物研究所, 青海, 西宁, 810001
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1673-5021 |
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学科
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畜牧、动物医学、狩猎、蚕、蜂 |
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基金
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国家中西部专项基金
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文献收藏号
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CSCD:2747940
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