Habitat effect on vegetation ecology and occurrence on urban masonry walls
Habitat effect on vegetation ecology and occurrence on urban masonry walls
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DOI：
10.1016/j.ufug.2010.02.004
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发表时间：
2010-01-01
影响因子：
6.4
通讯作者：
Chen, Wendy Y.
中科院分区：
文献类型：
--
作者：
Jim, C. Y.;Chen, Wendy Y.
城市包含各种各样的栖息地，支持植物的建立和持久性。本研究的重点是一个特殊的垂直人工栖息地：砖石挡土墙在香港。探讨了不同植物生长型的多样性和共存性、生境条件的综合评价以及生境因子与植被发生的关系。约270墙显着的植物定植在旧区进行了研究。我们调查了内在的墙壁织物，外在的网站条件，树种和丰富度，和其他类型的植物覆盖。利用主成分分析和多元回归分析对数据进行了评价。一个广泛的物种和生长形式的集合已经自发地建立在墙上。树木植物群以桑科（桑葚科）成员、榕属（无花果或榕树），特别是小果榕属（Ficus microcarpa）为主。具有扼杀者特征的树木预先适应垂直栖息地生长，受到强烈青睐，其次是杂草和花园逃犯。本地人的数量远远超过外来人。多壁属性可以浓缩为四个因素，分为水营养供应，栖息地连接，结构维护，栖息地的大小。生境因子对植被发生的作用取决于植物的生长形态和大小。小型地衣苔藓的发生与基本的营养水分因子有关。较大的成熟树木更依赖于较大规模的栖息地大小因素。中等大小的植物，包括草本植物，灌木和树苗，取决于水营养和生境连通性的双重影响。与自然生态系统的空间邻接可以确保种子、水、养分、温和的小气候和清洁的空气的持续供应，以促进壁植被的生长。保护植物墙及其伴生植物群可以避免这些关键的有利因素退化或减少。城市生态遗产应该得到保护，使其免受不必要的、误导的和有害的影响。(C)2010年Elsevier GmbH。All rights reserved.
Cities contain a diverse range of habitats that support plant establishment and persistence. This study focuses on a particular vertical artificial habitat: masonry retaining walls in Hong Kong. We explored the diversity and co-existence of different plant growth forms, synoptic assessment of habitat conditions, and relationship between habitat factors and vegetation occurrence. Some 270 walls with notable plant colonization in old districts were studied. We surveyed intrinsic wall fabric, extrinsic site condition, tree species and abundance, and other types of plant cover. The data were evaluated with the help of principal component and multiple regression analyses. A wide assemblage of species and growth forms have established spontaneously on walls. The tree flora is dominated by Moraceae (Mulberry family) members, genus Ficus (figs or banyans), and particularly Ficus microcarpa. Trees with strangler characteristics pre-adapted to grow on the vertical habitat are strongly favoured, followed by ruderals and garden escapees. Natives outnumber exotics by a large margin. Multiple wall attributes could be condensed into four factors, classified as water-nutrient supply, habitat connectivity, structure-maintenance, and habitat size. The action of habitat factors on vegetation occurrence hinges on plant growth form and dimension. The occurrence of diminutive lichen-moss is related to the fundamental sustenance water-nutrient factor. The bigger mature trees are more dependent on the larger-scale habitat size factor. The medium-sized plants, including herbs, shrubs and tree seedlings, are contingent upon the dual influence of water-nutrient and habitat connectivity. Spatial contiguity with natural ecosystem can secure continual supplies of seeds, water, nutrient, genial microclimate, and clean air to foster wall vegetation growth. The conservation of walls and their companion flora could avoid degrading or reducing these critical enabling factors. The urban ecological heritage deserves to be protected from unnecessary, misinformed and harmful impacts. (C) 2010 Elsevier GmbH. All rights reserved.