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首页> 外文期刊>Flora >Persistent soil seed banks and floristic diversity in Fagus orientalis forest communities in the Hyrcanian vegetation region of Iran
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Persistent soil seed banks and floristic diversity in Fagus orientalis forest communities in the Hyrcanian vegetation region of Iran

机译：伊朗Hycanian植被区的东方栎森林群落中持久的土壤种子库和植物区系多样性

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摘要

We assessed the size of seed bank, species diversity and similarity between seed bank and standing vegetation in four oriental beech (Fagus orientalis Lipsky) community types of the central Hyrcanian forests of northern Iran. For this purpose a total of 52 relevés was established in two associations and two subassociations of the beech forests, and six soil samples (20×20cm square and to a depth of 10cm) were collected in each relevé in mid-spring, after the germination season had ended. Soil seed bank was investigated using the seedling emergence method. A total of 63 species, 57 genera and 36 families was represented in the persistent soil seed bank of the forest communities. The seed bank contained 28 species not found as adult plants in the vegetation, but these were mostly early successional species. Size of the seed bank ranged from 3740 to 4676 individuals m~(-2) in the Rusco hyrcani-Fagetum orientalis and Danae racemosae-Fagetum orientalis associations, respectively. Species composition of seed banks and aboveground vegetation had low similarity with an average of 24.3% in the four plant communities, because only 38% of the species were the same in the vegetation and the seed banks. Most seeds in the seed bank were from early successional species, and the only tree with a large persistent seed bank was the fast-growing pioneer Alnus subcordata. DCA ordination also demonstrated low similarity between soil seed bank and vegetation. The soil seed banks of the four beech communities did not differ significantly in size, composition, diversity and uniformity. Although above ground vegetation in the four community types is floristically distinct, there is considerable overlap among the soil seed banks because they contain in a similar way early successional species. Further, the absence of typical forest species in the soil seed bank indicates that restoration of forest tree species cannot rely on the soil seed bank.
机译：我们评估了伊朗北部中部Hyrcanian森林的四种东方山毛榉（Fagus Orientalis Lipsky）群落类型的种子库大小，物种多样性以及种子库与站立植被之间的相似性。为此，在山毛榉森林的两个协会和两个子协会中建立了总共52个关联，并在发芽后的春季中的每个关联中收集了六个土壤样本（20×20cm见方，深度为10cm）。季节结束了。使用幼苗出苗方法调查了土壤种子库。森林群落的持久土壤种子库中共有63种，57属和36个科。种子库中有28种在植被中未发现为成年植物的物种，但这些大多是早期演替物种。在Rusco hyrcani-Fagetum Orientalis和Danae racemosae-Fagetum Orientalis协会中，种子库的大小分别为3740至4676个个体m〜（-2）。种子库和地上植被的物种组成相似度很低，在四个植物群落中平均为24.3％，因为植被和种子库中只有38％的物种相同。种子库中的大多数种子都来自早期演替物种，唯一具有较大持久种子库的树是快速生长的先锋Alnus subcordata。 DCA排序还证明了土壤种子库和植被之间的相似度很低。四个山毛榉群落的土壤种子库在大小，组成，多样性和均匀性上没有显着差异。尽管四种群落类型中的地上植被在植物上是不同的，但土壤种子库之间存在相当多的重叠，因为它们以相似的方式包含早期演替物种。此外，土壤种子库中不存在典型的森林物种，这表明林木物种的恢复不能依靠土壤种子库。

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