Abstract

The relationship between bryophyte community characteristics, alterations in species diversity, and microhabitat characteristics on various types of urban walls remains ambiguous. This study investigates the distribution and habitat characteristics of bryophytes on various types of urban walls in karst areas. The α and β diversity indices were employed to examine the variation of bryophytes on these walls. Additionally, a canonical correspondence analysis was conducted to analyze the relationship between bryophyte species composition and their microhabitat. The results showed that: (1) There were 14 families, 32 genera, and 80 species of wall bryophytes (including six species of liverworts) on urban walls. Brachytheciaceae, Pottiaceae, and Hypnaceae were the dominant families. Bryophyte species were most abundant on stone retaining walls, followed by concrete revetment. Bryophytes were mainly distributed in the face and base of concrete walls, the top, face, and base of stone walls, and the top of brick walls. (2) The species distribution across the nine types of walls was highly uneven, stone retaining walls exhibited the highest species diversity, while concrete revetment and freestanding walls demonstrated strong habitat heterogeneity. (3) The species composition of wall bryophytes was intricately linked to the properties of the wall and micro-environmental factors, with wall temperature and air humidity being the key determinants. These findings can serve as a benchmark for assessing the diversity and ecosystems of urban wall bryophytes. By enhancing the conservation and restoration of various types of wall bryophytes, we can bolster the self-sustaining mechanisms of urban ecosystems.

中文翻译：

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喀斯特城市贵阳不同类型城墙上苔藓植物的物种多样性及微生境特征

 抽象的

苔藓植物群落特征、物种多样性变化和各类城市墙壁上的微生境特征之间的关系仍然不明确。本研究调查了喀斯特地区各类城市城墙上苔藓植物的分布和生境特征。采用α和β多样性指数来检查这些墙上苔藓植物的变化。此外，还进行了典型对应分析来分析苔藓植物物种组成与其微生境之间的关系。结果表明：（1）城市城墙上壁苔藓植物有14科32属80种（其中苔类植物6种）。 Brachytheciaceae、Pottiaceae 和 Hypnaceae 是主要科。石头挡土墙上的苔藓植物种类最多，其次是混凝土护岸。苔藓植物主要分布在混凝土墙的面、底，石墙的顶、面、底，砖墙的顶。 (2) 九种墙体的物种分布极不均匀，石质挡土墙的物种多样性最高，而混凝土护岸和独立式墙体则表现出较强的生境异质性。 (3)墙体苔藓植物的物种组成与墙体性质和微环境因素密切相关，其中墙体温度和空气湿度是关键决定因素。这些发现可以作为评估城市墙体苔藓植物多样性和生态系统的基准。通过加强各类墙体苔藓植物的保护和修复，增强城市生态系统的自我维持机制。