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标题：The Alpine Soil Seed Bank in Relation to Field Seedlings and Standing Vegetation in Subarctic Finland
其他标题：The Alpine Soil Seed Bank in Relation to Field Seedlings and Standing Vegetation in Subarctic Finland
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作者：Pirjo Welling ; Anne Tolvanen ; Kari Laine 等
期刊名称：Arctic, Antarctic, and Alpine Research
印刷版ISSN：1523-0430
电子版ISSN：1938-4246
出版年度：2004
卷号：36
期号：2
页码：229-238
DOI：10.1657/1523-0430(2004)036[0229:TASSBI]2.0.CO%3B2
摘要：This study investigated the relationship of seed bank and field seedlings on the structure of standing vegetation. We also studied the roles in sexual regeneration of seed size, diaspore morphology, and the ability to regenerate vegetatively. Seed banks, field seedlings, and standing vegetation were sampled in 8 subarctic plant communities in Kilpisjärvi, Finland, in, 1995–1998. The seed bank densities varied from 99 to, 1109 viable seeds m 2−1 and decreased toward higher altitudes. The seed bank densities were significantly larger than the field seedling densities in the closed vegetation of the lower slopes, whereas the differences were smaller in the open, late-melting snowbeds on higher slopes. The species that occurred only in the seed bank had small seeds or appendaged diaspores. The field seedling densities were high in plant communities dominated by species with ineffective vegetative reproduction or by species with diaspores and with pappus. The floristic similarity was low between the seed bank, field seedlings, and standing vegetation. The nonmetric multidimensional scaling revealed that the species diversity was lower in the seed banks than in standing vegetation and field seedlings. The results indicate that all transitions equally constrain the sexual regeneration of vegetation. Clonality, very small and very large seed sizes, appendaged diaspores, and possibly narrow first leaves in seedlings are traits that limit the transition of plants from standing vegetation to the phase of field seedlings via seed bank. Persistent seed bank has a minor role compared to clonal growth in the regulation of vegetation structure.