Impact of urbanization on plant diversity: A case study in built-up areas of Beijing

查看全文 作　　者：LIANG Yao-[1,2]qin;LI Jing-[1]wen;LI [1]Jing;Sanna Katrina [3]VALIMAKI 机构地区：[1]Key Laboratory for Silviculture and Conservation of Ministry of Education, Beijing Forestry University, Beijing 100083, P. R. China;[2]School of Environmental and Urban Studies, Shenzhen Graduate School, Peking University, Shenzhen 518055, E R. China;[3]Department of Forest Ecology, University of Helsinki, Helsinki FI-00014, Finland 出　　处：《Forestry Studies in China》索引2008年第10卷第3期,共10页 基　　金：the Foundation of Key Discipline Construction in Beijing;the Program of the Key Laboratory, Ministry of Education (JD100220648) 摘　　要：Urbanization is developing rapidly in the world, which seriously changes the habitat of organisms and has clearly a nega-tive effect on biodiversity. Preservation of biodiversity is crucial in urban planning and management, which is also an important symbol for the level of greening. Problems such as scarcity of urban green space and plant species have become obstacles to the es-tablishment of ecological friendly cities. However, coexistence of nature and modernization, as well the coordination of economic development and biodiversity, are goals that people are seeking. We have taken the built-up areas of Beijing as a study case and dis-cussed the impacts of urbanization on plant diversity, with the support of fieldwork and SPOT remote sensing data. The results are as follows: 1) in the process of urbanization, exotic plants have been widely introduced, which has affected species composition and the proportion of native plants; it is clear that artificial green spaces always will have a lower level of plant diversity than natural green spaces; 2) functional differences of green space types partially decide their species abundance, so that plant diversity in greenbelts and streets is generally lower than in parks; 3) the spatial variety of plant diversity contributes much to the imbalance of district de-velopment and the planning of different functional zones; this variation is embodied in different ring-belts and directions; 4) habitat fragmentation also affects plant diversity to a great extent; there is a significant positive correlation between high fragmentation and low plant diversity. According our results, some suggestions are proposed, which would be suitable for the preservation of plant di-versity and ecological improvement during urbanization. 关 键 词：物种多样性 高楼林立的地区 都市化 绿色地带