基于聚类分析的广东省乡土阔叶树种分布研究

Patterns of Indigenous Broadleaf Tree Species Distributed in Guangdong Province Based on Cluster Analysis

利用《中国植物志》、《广东植物志》等资料并结合实地野外踏查记录数据,获取了广东省1152个乡土阔叶树种的分布信息,在对其进行聚类分析的基础上采用多响应置换过程、指示种分析和Kruskal-Wallis检验,研究广东省乡土阔叶树种的分布特征。结果表明,乡土阔叶树种在广东省的分布具有较明显的纬度地带性,且可划分为3个分布区:Ⅰ区主要出现在广东省北部山区的中亚热带,树种丰富度的均值最大(376.5),缺萼枫香(Liquidambar acalycina)、椿叶花椒(Zanthoxylum ailanthoides)、伞花木(Eurycorymbus cavaleriei)等为主要指示种;Ⅱ区主要出现在广东省中部的南亚热带,树种丰富度的均值为339.8,肉桂(Cinnamomum cassia)、狭叶山黄麻(Trema angustifolia)、黄叶树(Xanthophyllum hainanense)等为主要指示种;Ⅲ区主要出现在广东省南部沿海的热带北缘,树种丰富度的均值最小(206.5),秋茄树(Kandelia candel)和山油柑(Acronychia pedunculata)等为主要指示种。

A tree database was constructed based on Flora of China,Flora of Guangdong,and complementary field survey checklists,comprising a total of 1152 indigenous broadleaf tree species distributed in Guangdong Province,China.Distribution patterns of the indigenous broadleaf tree species were analyzed by multi-response permutation procedures（MRPP）,indicator species analysis（ISA）and Kruskal-Wallis tests,according to their distribution range as delimited by cluster analysis.Results showed that the distribution of indigenous broadleaf tree species in Guangdong exhibited obvious latitudinal zonality,and were divided into three distribution regions.Region Ⅰwas mainly located in the Guangdong Northern Mountain Area,with Liquidambar acalycina,Zanthoxylum ailanthoides,and Eurycorymbus cavaleriei as the main indicator species.This region represented the mid-subtropical zone.RegionⅡ was mainly in the central area of Guangdong,with Cinnamomum cassia,Trema angustifolia,and Xanthophyllum hainanense as the main indicator species,representing the characteristic species of the south subtropical zone.RegionⅢ consisted of the coastal areas in southern Guangdong and its main indicator species were Kandelia candel and Acronychia pedunculata.Region Ⅰ had the highest species richness,followed by Region Ⅱ and then RegionⅢ,with mean values of 376.5,339.8and 206.5,respectively.