青海湖地区芨芨草草地土壤种子库的初步研究
Soil seed banks of Achnatherum splendens steppes in the Qinghai Lake area
查看参考文献28篇
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文摘
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选择青海湖地区的次生芨芨草草地为研究对象,以围栏内封育和围栏外自由放牧的草地做对照,研究了围栏内外土壤种子库的萌发状况、密度和数量、物种多样性,以及土壤种子库与地上植被的关系。结果表明,围栏内外土壤种子库的萌发趋势非常相似,但是萌发种子累计数量不同;围栏内外土壤种子库中萌发种子的平均密度分别为3660和2460粒·m-2,围栏内萌发种子数比围栏外提高了48.8%;围栏内外土壤种子库的物种多样性指数差异较大,围栏内外丰富度指数R1分别为17和13,R2为3.693和2.832,丰富度围栏内大于围栏外,多样性指数和丰富度指数具有相同的规律,均匀度指数围栏内外分别为0.812和0.857,则是围栏外大于围栏内。围栏内外地上植被群落组成存在显著差异,围栏内的封育草地的物种丰富度和多样性指数均大于围栏外的放牧草地,而均匀度指数则呈相反趋势。 |
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其他语种文摘
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The study was conducted in the sheep breeding pasture-land of Sanjiao in Qinghai Province, which was located on the northern bank of Qinghai Lake. The germinated seed accumulation, density, amount, diversity of Achnatherum splendens communities, soil seed banks, and relationship between the vegetation and soil seed banks were studied and compared within and out of the fence. The results showed that the germination trend of soil seed banks was similar within and out of the fence, while the seed accumulation was different. The aver-age density of germinationant seed within and out of the fence was 3660 seeds1 m"2 and 2460 seeds- m"2. The number of seed accumulation was between 103 and 104 seeds-m"2. Diversity indices of soil seed banks within and out of the fence were significantly different. Richness indices Rl and R2 within and out of the fence were 17 and 13,3.693 and 2. 832, respectively. The change of diversity indices was the same as richness indices. Evenness indices El within and out of the fence were 0.812 and 0. 857 respectively. The community composi-tion within and out of the fence was significantly different. The diversity index change of vegetation was the same as the soil seed banks. |
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来源
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生态学杂志
,2005,24(7):724-728 【核心库】
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关键词
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青海湖地区
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芨芨草草地
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土壤种子库
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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, 810008
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中国科学院研究生院, 北京, 100039
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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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1000-4890 |
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学科
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植物学 |
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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:2135392
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