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草地学报  2015 

黄河源区退化高寒草甸48种常见植物种子萌发特性及其生态意义

DOI: 10.11733/j.issn.1007-0435.2015.04.012, PP. 744-751

Keywords: 黄河源区,种子大小,萌发策略,植被恢复

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Abstract:

本文通过对黄河源区退化高寒草甸48种常见植物种子的萌发特性研究,比较了不同功能群植物萌发行为的异质性,旨在揭示不同植物萌发对策的生态适应机制。结果显示萌发率超过80%的植物有17种,小于20%的有14种,1种植物未萌发;萌发速率在1以下的有15种,大于10的有21种;萌发起始时间小于5d的有12种,大于15d的有5种;有6种植物的萌发持续15d以上,30种植物的萌发在10d内结束。种子萌发速率与种子大小呈显著负相关(P<0.05),小种子物种有更高萌发率(P=0.085)和更早萌发起始时间(P=0.093)的趋势。48种植物的萌发划分为爆发型、过渡型、缓萌型和低萌型等4种类型,其中禾本科植物以爆发型为主,莎草科则是低萌型和缓萌型占优势,杂类草在几种萌发类型中均有分布,说明不同功能群植物在生存风险分摊上的异质性策略。

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