通辽市开发区行道树的组成及结构分析毕业论文.doc

通辽市开发区行道树的组成及结构分析毕业论文 目 录 中文摘要 2 英文摘要 3 引言 4 1 研究地概况 5 1.1 通辽市概况 5 1.2 开发区概况 5 1.3 地形地貌及气候 5 2 研究方法 5 2.1 调查内容 5 2.2 调查方法及数据处理 5 3 结果分析 6 3.1 行道树概况 6 3.2 重要值分析 7 3.3 胸径结构分析 8 3.4 树高分析 10 4 结论与讨论 11 参考文献 12 致谢 13  摘 要 行道树作为城市园林绿化的骨干，在创造优美的城市景观和改善城市生态环境中发挥着十分重要的作用。6科7属9种，其中国槐的多度、频度、重要值等多项指标均为最高，分别为582株，频度63.64%，重要值是37.98，其他树种重要值均不超过15，在此以重要值超过7的为主要分析对象。调查区域内总平均树高为6.88m，高度处于4—7m之间的树木最多，占总数的49.02%。分析调查结果得出开发区行道树多数属于青年树种，行道树存在乡土树种运用较少，道路绿化存在种类单一，地方特色不够明显，缺乏色彩与季相变化等问题，并在文章最后提出改变当前现状、丰富行道树种的对策和建议Abstract As the backbone of urban landscaping, street tree plays a very important role in creating graceful city view and improving urban ecological environment. In this thesis, starting from the street tree field investigation in Tongliao Development Zone, via qualitative and quantitative analysis of varieties, quantities, tree species structure and growth of street trees, finding out there are 6 families 7genuses and 9 species of the street tree in surveyed area .Among them in abundance, frequency, importance value of the indexes were the highest, respectively 582 strains, frequency 63.64%, important value is as high as 37.98, other species importance value does not exceed 15, this analysis of important value of more than 7 of the dominant tree species. The survey area total average tree height is 6.88m, height is between 4m to 7m trees the most, accounting for 49.02% of the total. To sum up the Development Zone trees most conclusion belongs to the young tree species, ecological system through late growth development zone will become more perfect.There are some problems such as lacking of domestic tree species planning, plant species too single and lacking of local characteristics, meanwhile the colors of street tree cannot responses the change of seasons. At the end of the thesis, regarding to the analysis of the above problems, provide Countermeasure and suggestion to improve current situation and rich street tree species. Key words：Development Zone; S