| 广西西南桦天然居群的表型变异 |
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| 引用本文： | 曾杰,郑海水,甘四明,白嘉雨. 广西西南桦天然居群的表型变异[J]. 林业科学, 2005, 41(2): 59-65 |
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| 作者姓名： | 曾杰 郑海水 甘四明 白嘉雨 |
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| 作者单位： | 中国林业科学研究院热带林业研究所,广州,510520 |
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| 摘 要： | 以广西壮族自治区的西南桦天然分布区为研究对象 ,调查了 11个居群 190个单株的 12个表型性状指标 ,运用变异系数和巢式方差分析研究了居群间和居群内的表型变异 ;应用相关分析揭示了表型性状间及其与地理、气候因子间的相关性以及表型变异的地理格局 ;并且运用聚类分析进行了居群分类。结果表明 ,西南桦天然居群内的变异远大于居群间的变异 ,居群分化较小 ;侧脉数、叶片基部至最宽处距离与经度、纬度显著相关 ,叶片长与经度相关显著 ,种翅宽与海拔显著相关 ,存在较明显的地理变异趋势。而表型性状的Mahalanobis距离与地理距离间相关不显著。研究结果为西南桦的遗传改良工作奠定了基础 ,为制定西南桦育种策略和天然林持续利用对策提供了科学依据
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| 关 键 词： | 西南桦 天然居群 表型变异 地理变异格局 居群分化 |
| 文章编号： | 1001-7488(2005)02-0059-07 |
| 修稿时间： | 2002-11-04 |
Phenotypic Variation in Natural Populations of Betula alnoides in Guangxi, China |
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| Zeng Jie,Zheng Haishui,Gan Siming,Bai Jiayu. Phenotypic Variation in Natural Populations of Betula alnoides in Guangxi, China[J]. Scientia Silvae Sinicae, 2005, 41(2): 59-65 |
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| Authors: | Zeng Jie Zheng Haishui Gan Siming Bai Jiayu |
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| Abstract: | phenotypic traits were investigated for 190 individuals in 11 natural populations of Betula alnoides from Guangxi,China using nested variance analysis,correlation analysis and clustering analysis.etc.The variation within populations was much greater than that among populations,which inferred that little differentiation was observed among populations.Among 12 phenotypic traits,number of lateral veins,height of maximum width were remarkably correlated to both longitude and latitude,length of leaves to longitude,and width of seed wing to altitude.There was no significant relationship between geographic distances and mahalanobis distances calculated from all phenotypic traits.These findings will lay a foundation for genetic improvement in B.alnoides, and provide scientific basis for working out breeding strategy in this species and for contermeasures of natural forest sustained utilization. |
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| Keywords: | Betual alnoides natural population phenotypic variation geographic variation pattern population differentiation |
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