| 垂穗披碱草个体大小依赖的繁殖分配与种群密度的关系 |
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| 引用本文： | 杜国祯,孙国钧,王兮之,刘振恒.垂穗披碱草个体大小依赖的繁殖分配与种群密度的关系[J].草业学报,1999(2). |
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| 作者姓名： | 杜国祯 孙国钧 王兮之 刘振恒 |
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| 作者单位： | 兰州大学干旱农业生态国家重点实验室，甘肃玛曲县草原工作站 |
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| 摘 要： | 研究了垂穗披碱草在不同密度条件下的繁殖能力与个体大小的关系。结果表明：１）垂穗披碱草能够进行有性繁殖的个体比例随密度的增加而下降；２）平均每个个体的繁殖体重量随密度的增加而明显下降；３）个体繁殖体重量与地上部生物量间呈显著的线性关系，而回归斜率则随密度的增加而略有下降；４）繁殖分配比例未随密度发生明显的变化。由此可见，竞争对垂穗披碱草繁殖分配的影响不大，其繁殖体大小随密度的可塑性变化是由于个体总生物量随密度的可塑性变化所致。繁殖分配比例与个体大小间没有明显的相关性，进一步说明了垂穗披碱草的繁殖分配比例为一定值。
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| 关 键 词： | 繁殖分配 个体大小 种群密度 垂穗披碱草 |
The Relationship Between SizeDependent Reproduction andPopulation Density of Elymus
nutans |
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| Du GuozhengSun GuojunWang Xizhi.The Relationship Between SizeDependent Reproduction andPopulation Density of Elymus
nutans[J].Acta Prataculturae Sinica,1999(2). |
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| Authors: | Du GuozhengSun GuojunWang Xizhi |
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| Abstract: | The relationship between the weight of reproductive structure, reproductive
allocation and individual size of Elymus nutans at different densities was studied in the
present paper. The results showed that 1. the ratio of sexual reproductive individuals
decreased with increasing density; 2. the mass of reproductive structure decreased
significantly with increasing density; 3. there was a linear relationship between the mass of
reproductive structure and the total aboveground mass of individuals, and the slopes of linear
regression were decreasing slightly with increasing density; 4. reproductive allocation did not
change significantly with increasing density. The above results indicated that the influence of
competition on reproductive allocation of Elymus nutans was not important and that the plastic
variable of size in reproductive structure with densities was determined by the plastic variable
of total biomass of individuals. There was not significant relativity between reproductive
allocatioand size of individuals, which indicated that reproductive allocation of BX]Elymus
nutans was constant. |
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| Keywords: | Reproductive allocation individual size population density Elymus nutans n |
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