Diversity and ecology of vascular plants established on the extant world-longest ancient city wall of Nanjing,China |
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| Institution: | 1. College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China;2. College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China;1. Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresources, School of Life and Pharmaceutical Sciences, Hainan University, Haikou 570228, China;2. Department of Biology, Algoma University, Sault Ste. Marie, Ontario, P6A 2G4 Canada;3. School of Forest Resources & Conservation, Fort Lauderdale Research and Education Center, University of Florida, Davie, FL 33314;4. Beijing University of Civil Engineering and Architecture, No. 1, Zhanlanguan Road, Xicheng District, Beijing, 100044, China;5. The Key Laboratory for Urban Geomatics of National Administration of Surveying, Mapping and Geoinformation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China;1. Department of Chemistry and CSGI, University of Florence, via della Lastruccia, 3, 50019 Sesto Fiorentino (FI), Italy;2. Mirabile, 11, rue de Bellefond, 75009 Paris 09, France;1. Centre d''Ecologie et des Sciences de la Conservation (CESCO, UMR7204), Sorbonne Université, MNHN, CNRS, UPMC, CP135, 61 rue Buffon, 75005 Paris, France;2. Faculty of Engineering, Lebanese University, Tripoli, Lebanon;3. Water & Environment Science Laboratory, Faculty of Public Health, Lebanese University, Tripoli, Lebanon;1. Griffith University, Australia;2. Karlstad University, Sweden;3. Massey University, New Zealand;4. National Changhua University of Education, Taiwan |
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| Abstract: | Spontaneous vegetation established on the city wall constitutes a characteristic greenspace within the urban matrix. Nanjing city wall of the Ming Dynasty (NJCW), as an extraordinary huge defensive masonry project, was built in 1393, the extant, basically intact ancient city wall is 25.09 km long, 9–26 m high, and is protected now as a key national cultural relic. Species composition and life forms of the vascular plants established on the vertical or inclined wall surfaces of NJCW were investigated, and its diaspore sources and dispersal modes were also analyzed. Totally, 159 species in 125 genera of 70 families were found inhabiting the joints between bricks or between block stones, trees, shrubs and woody lianas accounts for 51.57% of the species assemblage, while herbaceous plant species makes up 48.43% of them. Fifteen alien species were found colonizing NJCW, including 12 invasive species. Six 100-m-long quadrats were sampled in different segments of NJCW, each quadrat contained 39–77 species, and 755–3006 individuals. In total, 10785 individuals of vascular plants were recorded, consisting of 104 species in 89 genera of 56 families. 65.25% of the total individuals, and 53.85% of the total species are adapted to the primary dispersal of diaspores by wind, whereas 34.75% of the individual assemblage, and 46.15% of the species assemblage are adapted to the primary dispersal of seeds by birds. A bird-dispersed, native pioneer tree, Broussonetia papyrifera, was the most abundant species among the six quadrats, even developed coppices on the vertical wall surface. Location and aspect of the quadrats may have affected the species diversity of vascular plants established on its wall surfaces. A diversity of vascular plants established on NJCW, as a valuable urban ecological heritage, is worthy of sustainable wall management, while management priorities should be given to those large trees inhabiting the walls made of bricks, and to the invasive alien species to prevent them from further spreading over the adjacent urban habitats. |
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| Keywords: | Alien plants Diaspore dispersal Management strategy Native plants Spontaneous vegetation |
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