Li Xiaopeng, Li Yilun, Zhang Sining, Lin Rong, Chen Mingkun, Feng Li
School of Architecture, Southwest Jiaotong University, Chengdu 611756, Sichuan, China.
Division of Landscape Architecture, Faculty of Architecture, The University of Hong Kong, Hong Kong.
Sci Total Environ. 2023 Jun 10;876:162775. doi: 10.1016/j.scitotenv.2023.162775. Epub 2023 Mar 11.
River corridors are critical in connecting fragmented greenspace and providing habitats for plants and animals. There is a paucity of information on the detailed influence of land use and landscape patterns on the richness and diversity of distinct life forms of urban spontaneous vegetation. This study aimed to identify the variables that dramatically affect spontaneous plants and then disentangle how to manage such a variety of land types to maximize the biodiversity-supporting function of urban river corridors. The total species richness was remarkably influenced by the amount of commercial, industrial, and waterbody area and the landscape complexity of water, green space, and unused land. In addition, the spontaneous plant assemblages of different life forms significantly differed in their responses to land use and landscape variables. Vines were more sensitive to urban sites, i.e., strongly negatively affected by residential and commercial areas but positively supported by green space and cropland. Multivariate regression trees indicated that the total plant assemblages were clustered most remarkably by the total industrial area, and the classified responding variables differed among distinct life forms. The colonizing habitat of spontaneous plants explained a high proportion of the variance and was also closely related to the surrounding land use and landscape pattern. These scale-specific interaction effects ultimately determined the variation in richness among various spontaneous plant assemblages in urban sites. Based on these results, in future city river planning and design, spontaneous vegetation could be protected and promoted by a nature-based solution according to their adaptability and preference for distinct landscape characteristics and habitat features.
河流廊道对于连接破碎化的绿地以及为动植物提供栖息地至关重要。关于土地利用和景观格局对城市自发植被不同生命形式的丰富度和多样性的详细影响，目前信息匮乏。本研究旨在确定对自发植物有显著影响的变量，然后理清如何管理各类土地类型，以最大限度地发挥城市河流廊道的生物多样性支持功能。总物种丰富度受商业、工业和水体面积以及水、绿地和未利用土地的景观复杂性显著影响。此外，不同生命形式的自发植物组合对土地利用和景观变量的响应存在显著差异。藤本植物对城市用地更为敏感，即受到居住区和商业区的强烈负面影响，但得到绿地和农田的积极支持。多元回归树表明，总植物组合受总工业面积的聚类最为显著，且分类响应变量在不同生命形式之间存在差异。自发植物的定殖生境解释了很大一部分变异，并且也与周围的土地利用和景观格局密切相关。这些特定尺度的相互作用效应最终决定了城市用地中各种自发植物组合丰富度的变化。基于这些结果，在未来的城市河流规划和设计中，可以根据自发植被对不同景观特征和栖息地特征的适应性和偏好，通过基于自然的解决方案来保护和促进它们。
