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Beiträge zur Flora der Stadt Zürich Ⅱ. Monokotyledonen

机译:对苏黎世市植物区系的贡献Ⅱ。单子叶植物

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"Flora of the city of Zuerich" includes 350 monocot species. 28 of these are frequent ergasiophytes and ephemerophytes which scarcely spread within the area. Only about half of the remaining 322 species are not endangered, 45 (14%) are extinct (Ex), 69 (21%) endangered (E), and 48 (15%) vulnerable (V). Five systematic groups may be distinguished in respect to their dynamics: A) families with predominantly water and fen plants; B) Cyperaceae and Juncaceae; C) Gramineae (Poaceae); D) Liliaceae, Amaryllidaceae, Iridaceae, Dioscoreaceae; E) Orchidaceae. The group D is characterized by the highest percentage of neophytes (37%), the highest percentage of species increasing in frequency (50%), the lowest percentage of endangered as well as vulnerable and extinct species (18% and 10%, respectively), and the highest degree of urbanity. On the other hand, neither neophytes nor species increasing in frequency are represented in group E. However, 22% of the species of this group are extinct and 52% vulnerable or endangered. The degree of urbanity of the species is very low. It is important to the conservation and promotion of the endangered plants to protect the few remaining areas with a high species diversity (Ueetliberg, Katzensee, Wehrenbach-tobel). On the other hand, many smaller less spectacular areas containing rare species should also be preserved. Open sites, e.g., gravel places, not-sealed parking lots and industrial areas, road sides, stone walls, railway escarpments are, too, favourable compensatory sites for weeds and pioneer plants.
机译:“苏黎世市花市”包括350个单子叶植物物种。其中28种是常见的气生植物和表生植物,几乎不在该区域内扩散。其余322种物种中只有大约一半未濒临灭绝,45种(14%)已灭绝(Ex),69种(21%)濒危(E)和48种(15%)脆弱(V)。在动力方面可以分为五个系统的群体:A)主要有水和芬芳植物的家庭; B)莎草科和菊科; C)禾本科(禾本科); D)百合科,石蒜科,鸢尾科,薯os科; E)兰科。 D组的特征是新生植物百分比最高(37%),频率增加的物种百分比最高(50%),濒危物种以及脆弱和灭绝物种的百分比最低(分别为18%和10%) ,并且城市化程度最高。另一方面,E组中既没有新生物,也没有频率增加的物种。但是,该组中有22%的物种已灭绝,而52%的脆弱性或濒临灭绝。该物种的城市化程度非常低。对于保护和推广濒临灭绝的植物而言,重要的是保护少数几个物种高度多样性的地区(Ueetliberg,Katzensee,Wehrenbach-tobel)。另一方面,还应保留许多稀有物种稀少的较小景点。露天场所,例如砾石场所,未密封的停车场和工业区,路边,石墙,铁路悬崖,也是杂草和先锋植物的有利补偿地点。

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