中文摘要：

以上海市外环林带为研究对象,采用群落学调查的方法调查植物群落177个,结果如下：共记录维管植物87科184属226种,但少数树种主导整个林带,在树种构成上具有明显的集聚性.并且乡土树种应用比例低,乡土树种和外来树种的比例达到了1∶3.群落类型丰富,分为7种植被类型,67个群落类型,以落叶阔叶林和常绿阔叶林为主,但缺乏地带性植被类型.群落物种多样性低,乔木层的平均物种数为1.68,灌木层平均物种数为0.92.群落结构过于简单,多呈中间稀疏两头多的＂哑铃型＂特征,以＂乔木＋自然草本＂模式最多,林带树木总体生长势一般.

英文摘要：

An investigation of plant communities was conducted in Shanghai Green Belt and 177 community plots were surveyed.The flora of vascular plant in the study area consisted of 226 species and varieties,184 genera and 87 families.But a few species dominated the whole belt,the ratio of native trees being only 25%.There were 67 community types,which were divided into 7 vegetation types,most of them were deciduous broad-leaved forest and evergreen broad-leaved forest;however,few of them were of zonal vegetation types.The species diversity of these communities was low.The result showed that the average number of species in the tree layer was 1.68,and in that the shrub layer was 0.92.The community structure was simple,featured as a dumbbell： sparse in the middle and dense on both sides,and generally in the model of ＂tree with natural herb＂.Most of trees are in poor growth.