浙江天童及周边地区常绿阔叶林退化群落的植物区系分析

浙江天童及周边地区的常绿阔叶林退化群落包括五个类型：常绿阔叶林退化前期群落、落叶阔叶林群落、针阔混交林群落、针叶林群落以及灌丛群落.通过对退化植被各群落类型的区系分析，得出了天童地区常绿阔叶林退化群落的区系组成特征，具体如下：（1）天童及周边地区退化植被的植物区系包括72科138属204种，其物种多样性低于常绿阔叶林的成熟群落；（2）本植物区系地理成分与常绿阔叶林成熟群落一致，表现了明显的亚热带植物区系性质，是热带向温带的过渡；（3）人类的干扰导致了各退化群落中国特有成分的下降；（4）各退化群落类型与常绿阔叶林成熟群落保持了较高水平的科、属和种的相似性.综上所述，天童及周边地区退化植被保持了亚热带常绿阔叶林的植物区系特征，从植物区系学的角度来看，具有恢复为地带性常绿阔叶林成熟群落的潜力.

Floristic Geographical Analysis of Degraded Communities of Evergreen Broad-leaved Forests around Tiantong National Forest Park, Zhejiang Province, China

The degraded vegetation around Tiantong contains five types of communities, such as earlier degraded community of EBLF, deciduous broad leaved forest community, coniferous and broad leaved mixed forest community, conifer forest community and shrub community. Based on the analysis of floristic compositions, geographical elements and characteristics of the flora, the major characteristics of the flora are as follows: (1) There are 72 families, 138 genus and 204 species in this regional flora of degraded vegetation. Because of the influence of human′s activity, degraded vegetation contain a comparatively lower floristic species richness than that of EBLF community; (2) The floristic characters are conspicuous for temperate and tropical subtropical element,which represents a transitional pattern of distribution from subtropical to temperate; (3) Destructions of vegetation lead to the number of endemic to China decreasing; (4) Although five types of degraded communities are different from each other in characteristics of floras, they maintain floristic characteristic and geographic elements of EBLF. These results show that the degraded vegetation around Tiantong has potential ability for nature restoration.