Seed mass and germination in an alpine meadow on the eastern Tsinghai-Tibet plateau
Seed mass and germination in an alpine meadow on the eastern Tsinghai-Tibet plateau
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DOI：
10.1007/s11258-006-9221-5
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发表时间：
2007-07-01
期刊：
影响因子：
1.7
通讯作者：
Du, Guozhen
中科院分区：
文献类型：
--
作者：
Bu, Haiyan;Chen, Xuelin;Du, Guozhen
在这项研究中，我们从青藏高原东部的高寒草甸建立了一个包含570种植物的数据库。研究了种子质量和发芽率与系统发育、生境和海拔的相关性，以及种子质量和发芽率的关系。结果表明：生境对种子质量和发芽力的影响不显著，这与前人的研究结果一致；种子质量与海拔高度、发芽力与海拔高度呈显著负相关，与以往大部分研究相反；种子质量与发芽率呈显著负相关，与已发现的正相关研究相反，种子质量可解释发芽力总变异的24.1%；在GLM中，科和属分别占种子质量总变异的43.9%和83.9%，发芽力分别占34.1%和65.4%，说明种子质量和发芽力与系统发育密切相关。我们认为，种子质量和萌发可能既是长期生态时间的选择压力的结果，也是分类成员长期进化历史制约的结果。我们建议在物种间种子质量和萌发的比较研究中应考虑生态学和系统发育的相关性。
In this study, we built up a database of 570 species from an alpine meadow on the eastern Tsinghai-Tibet plateau. We examined the correlation of seed mass and germination with phylogeny, habitat and altitude, and the relationship between seed mass and germination. We found that: habitats had no significant effects on seed mass and germinability, which was in accord with the former studies; there was a significant negative correlation between seed mass and altitude, as well as between germinability and altitude, which was opposite to most of the former studies; there was a significant negative correlation between seed mass and germinability, which was in contrast with other studies that have found a positive relationship, and seed mass could explain 24.1% of total variation in germinability; in GLM, family and genus accounted for 43.9% and 83.9% of total variation in seed mass, and 34.1% and 65.4% in germinability, respectively, thus, it was evident that seed mass and germinability were strongly related to phylogeny. We considered that seed mass and germination might be the result of both selective pressures over long-term ecological time and the constraints over long-standing evolutionary history of the taxonomic membership. We suggest that correlates of ecology and phylogeny should be taken into account in comparative studies on seed mass and germination among species.