成都城区河流廊道自生植物的物种组成及其响应不同生境的多度格局

自生植物具有多种生态功能，是人工建设环境中自发形成的荒野景观。以公园城市示范区成都市为研究地，选取贯穿主城区的3条河道样段，对其间多样微生境的自生植物物种组成和多度格局进行探究。共记录自生植物336种，生活型组成丰富。高频度及高多度的优势种所占比例很小，大部分物种属于低多度低盖度。岸上和水边的荒置地、自然驳岸所含物种数最多，而硬质驳岸支撑了更多蕨类植物。岸上绿地及铺装缝隙外来植物在群落中的多度显著较少；退化草坪中的自生植物也颇为丰富，夏季多年生草本在草坪群落中的多度显著高于其他微生境。可根据不同生境中物种多度、盖度格局进行保护和景观营建，以期更有效地提升城市河流廊道生态效益，并为市民提供更多荒野体验。

Species Composition and Abundance Pattern of Spontaneous Plants Responding to Various Habitats along Urban River Corridors in Chengdu

Spontaneous plants have a variety of ecological functions, which are wildscapes spontaneously occur in the built environment. Taking Chengdu, the park city demonstration area, as the research site, three river sample transects running through the main urban area were selected, and the species composition and abundance patterns of spontaneous plants in the diverse microhabitats were explored. The results showed that 336 species were recorded, containing rich life forms. The dominant species with higher frequency and higher abundance accounted for a small proportion, and most species were with low abundance and low coverage. The vacant lot on the riverfront and by waterside as well as natural riverbank harbor the most number of species, while the hard revetment wall supported more ferns. The abundance of exotic plants in the riverfront green space and pavement gap were significantly less, and the spontaneous plants were also quite rich in the degraded lawn. The abundance of perennial herbs in the lawn community in summer was significantly higher than that in other microhabitats. Spontaneous plant resources can be conserved and utilized according to the pattern of species abundance and coverage within different habitats, to more effectively improve the ecological benefits of urban river corridor and provide citizens with more wilderness experiences.