摘要
【目的】公共绿地是城市森林的重要组成部分,对维持城市生物多样性具有重要意义。通过对连云港市区10个公共绿地树木的调查,旨在探讨该地区的树种构成及其多样性,为城市生态环境建设提供科学参考依据。【方法】对所选公共绿地内的树木进行每木调查,记录胸径、树高、冠幅等数据;利用重要值、多样性指数、相似性指数等对数据进行分析。【结果】结果表明:连云港公共绿地共有树木28科58属84种,其中落羽杉、银杏、垂柳、荷花玉兰等少数几个种在数量和使用频度上较突出;树木组成的区系性质以温带为主。各公共绿地树木胸径径阶结构表明,多数样地均呈现正金字塔,说明绿地建成时间不长及较为合理的种群配置。多数样地树种重要值均集中出现在少数几个树种,同时郊区公共绿地花木比例较低。各样地间相似性系数在0.24～0.60之间,城郊之间的公共绿地无明显差异性规律。连云港10个公共绿地的Margalef指数、Shannon-Wiener指数、Simpson指数和Pielou均匀度指数分别为3.99、2.66、0.90和0.53,属于中等水平的生物多样性。【结论】合理维持树木多样性及优化树种结构是今后连云港城市森林生态建设需要关注的重点问题。
[Objective] Public green space is an important part of urban forest, which plays a crucial role in maintaining urban biodiversity. In order to understand the tree composition and species diversity, 10 plots were used to survey tree distribution in public green space across the city of Lianyungang city. This studymay provide a scientific reference for the urban ecological construction. [Method] Diameter at breast height, height, crown breadth and other indicators were measured in each tree in the study plots. Then, the importance value, indices of diversity and similarity index were calculated based on the collected data. [Result] There were 84 tree species belonging to 28 families and 58 genus in 10 public green space. Among these tree species, Taxodiumdistichum, Ginkgo b iloba, Salix b abylonica and Magnolia grandiflora occupied a more prominent position in the aspect of individuals and frequency. Temperate- tree species was main part of floristic element. Structure of tree diameter at breast height was pyramidtype in the most plots, indicating that the public green space was relative newt and the tree populations was healthy. Several tree species have relatively high importance value in most plots. Ornamental tree species was fewer in the suburban space. Similarity index among the plots ranged from 0.24 to 0.60. There were no significant differences between urban and rural areas. For the tree species diversity in 10 public green spaces, Margalef index was 3.99, Shannon-Wiener was 2.66, Simpson was 0.90 and Pielou index was 0.53. The diversity of these spaces was moderate as compared with those of other cities. [Conclusion] Maintaining the tree diversity and optimizing tree composition should be considered in future urbanforestecologicalconstruction of Lianyungang.
作者
谢春平
盛英杰
刘大伟
南程慧
方彦
刘东
XIE Chunping;SHENG Yingjie;LIU Dawei;NAN Chenghui;FANG Yan;LIU Dong(Nanjing Forest Police College,Nanjing 210023,China)
出处
《四川农业大学学报》
CSCD
北大核心
2018年第5期648-657,共10页
Journal of Sichuan Agricultural University
基金
江苏省教育厅"十三五"江苏省重点学科项目(2016-2020)
关键词
树木组成
多样性
公共绿地
连云港
tree composition
diversity
public green space
Lianyungang city
