重庆主城区住宅小区苔藓组成与多样性

目前对于人造生活环境中的苔藓植物组成与多样性所知甚少。本文报道了城市住宅小区中的苔藓植物多样性, 以丰富重庆市苔藓植物区系资料, 为小区环境质量评估提供依据, 为认识苔藓植物对新环境的适应能力提供科学基础。通过对重庆主城九区23个住宅小区进行详细调查, 报道苔藓植物19科33属84种。种类组成以土生的丛藓科和真藓科为主。常见种类包括小凤尾藓(Fissidens bryoides)、大叶石灰藓(Hydrogonium majusculum)、细叶小羽藓(Haplocladium microphyllum)、鳞叶藓(Taxiphyllum taxirameum)和绿片苔(Aneura pinguis)共5种。各住宅小区苔藓物种数介于5-25种之间。物种相似性程度非常低, 群落间差异较为显著, 多样性较高。苔藓生活型以丛集型为主。典范对应分析排序结果显示, 住宅小区居住户数对其苔藓物种多样性影响最大, 其次是绿地面积。研究结果表明, 住宅小区是城市苔藓植物的重要分布区域之一。地理环境差异、城市化水平、小区内部小生境条件和人为干扰程度可能是造成各住宅小区苔藓组成差异的原因。

Bryophyte composition and diversity within anthropogenic habitats in a residential area of Chongqing municipality city

Little is known about bryophyte composition and diversity in habitats created by residential areas. Ours is the first study aiming at gathering baseline information on the bryophyte flora of Chongqing municipality city and providing a scientific basis for evaluation of environmental quality and bryophyte adaptability in residential environments. Based on extensive field work, 84 bryophyte species in 33 genera and 19 families were reported from 23 residential areas in nine districts of Chongqing. Of those, 39.28% of the species belonged to Pottiaceae and Bryaceae, and most of them grew on soil. The most common species were Fissidens bryoides, Haplocladium microphyllum, Hydrogonium majusculum, Taxiphyllum taxirameum and Aneura pinguis. The number of bryophyte species in these 23 residential areas varied from 5 to 25. The similarity of bryophyte species composition between different residential areas was very low, suggesting the presence of distinct habitats and a high diversity among these areas. Turfs were the main life form of bryophytes that we observed. Canonical Correspondence Analysis revealed that the number of residents was the most influential factor in terms of the bryophyte species composition and diversity, followed by the area of green space. Our results suggested that, within cities, residential areas contain important environments for bryophytes. Observed differences in bryophyte composition among residential areas may be attributed to spatial background, urbanization, microhabitat and human disturbance.