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首页> 外文期刊>Ecological research >Persistent soil seed banks in old-growth Hyrcanian Box tree (Buxus hyrcana) stands in northern Iran
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Persistent soil seed banks in old-growth Hyrcanian Box tree (Buxus hyrcana) stands in northern Iran

机译：伊朗北部生长的古老Hyrcanian Box树（Buxus hyrcana）中的持久土壤种子库

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摘要

Little is known about the soil seed bank and the influence of plant communities on the interaction between the seed bank and aboveground vegetation in the Hyrcanian temperate deciduous forest. We surveyed species composition and diversity of the persistent soil seed bank and the aboveground vegetation in six community types in old-growth Hyrcanian Box tree (Buxus hyrcana) stands in northern Iran. Fifty-two species with an average of 3,808 seeds/spores m~(-2) germinated; forbs accounted for 64% of the seed bank flora. Thirty-four species in the aboveground vegetation were not presented in the seed bank, 32 species in the seed bank were not found in the vegetation, and 20 species were in both. The dominant tree species were Diospyros lotus and Alnus subcordata with an average of 17 and 4.6 seeds m~(-2), respectively. Our results suggest that (1) vernal geophytes and shade-tolerant perennials are not incorporated in the seed bank, (2) early successional species are well represented in the seed bank, (3) plant community type has significant impacts on seed bank densities, and seed bank richness and diversity were significantly related to presence/absence of Box tree in the aboveground vegetation. The persistent seed bank contained species that potentially have a negative impact on the regeneration of forests, thus forest managers should retain old-growth Hyrcanian Box tree stands to conserve disturbance-sensitive indicator forest species.
机译：对于Hyrcanian温带落叶林中的土壤种子库以及植物群落对种子库与地上植被之间相互作用的影响知之甚少。我们调查了伊朗北部古树Hyrcanian Box Box（Buxus hyrcana）林中六个群落类型的持久性土壤种子库和地上植被的物种组成和多样性。 52种平均萌发约3,808个种子/孢子的m〜（-2）；杂草占种子库植物的64％。种子库中未发现地上植被中的34种，植被中未发现种子库中的32种，且两者中均未发现20种。优势树种为荷叶柿和and木，平均种子m〜（-2）分别为17和4.6。我们的结果表明，（1）种子库中未包含春生植物和耐荫多年生植物，（2）种子库中有很好的继代物种，（3）植物群落类型对种子库密度有显着影响，种子库的丰富性和多样性与地上植被中是否存在箱形树密切相关。持久的种子库中含有可能对森林再生产生负面影响的物种，因此森林管理者应保留较早生长的Hyrcanian Box树架，以保护对干扰敏感的指示性森林物种。

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