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首页> 外文期刊>Forest Systems >Seed mass variation, germination time and seedling performance in a population of Pinus nigra subsp salzamannii
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Seed mass variation, germination time and seedling performance in a population of Pinus nigra subsp salzamannii

机译：黑松Salzamannii种群的种子质量变化，发芽时间和幼苗性能

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摘要

Seed size and germination time are related to factors affecting natural regeneration of forest stands. Sources of seed mass variation and the effect of seed mass on seedling performance were investigated in a Pinus nigra subsp. salzmannii population. From eight maternal plants, seed mass variation was characterized for two crops at the within-individual level by mean, coefficient of variation, skewness and kurtosis values. Fifty seeds were planted in each of two substrate types, to monitor emergence, and survival and seedling performance during one growing season. Most variation in seed mass occurred within trees (c. 61%), rather than between them (c. 39%). Seed mass influenced emergence, depending on substrate type and mother plant. There were between-tree differences in the date of emergence, and a negative relationship was found between seed mass and date of emergence for the pine-seeds sown in peat substrate. The growth of seedlings was positively related to seed mass. It was argued that successful establishment of seedlings appears to be dependent on mother plant identity associated to seed traits, and that Pinus nigra stands could achieve regeneration by two different alternatives, depending on whether environmental variance overwhelms genetic variation.
机译：种子大小和发芽时间与影响林分自然更新的因素有关。在黑松亚种中研究了种子质量变化的来源以及种子质量对幼苗性能的影响。萨尔兹曼人口。从八种母本植物中，通过均值，变异系数，偏度和峰度值表征了两种作物在个体内的种子质量变异。在两种底物类型中分别种植了50种种子，以监测一个生长季节的出苗以及成活和幼苗生长。种子质量的大多数变化都发生在树木内部（约占61％），而不是树木之间（约占39％）。种子质量影响出苗，具体取决于基质类型和母本。泥炭基质中播种的松子种子的出苗日期存在树间差异，种子质量与出苗日期之间呈负相关。幼苗的生长与种子质量成正相关。有人认为，成功建立幼苗似乎取决于与种子性状相关的母本植物身份，而黑松林分能够通过两种不同的选择来实现再生，这取决于环境差异是否压倒了遗传变异。

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