东江干流河岸带植物群落类型分布格局研究

对东江干流河滨带植物群落类型进行详细调查,并对其空间分异情况进行了系统研究。根据野外调查所获90个样地数据资料,结合应用了TWINSPAN、DCA、CCA等数量分析方法。调查中共发现样内植物56科187属271种;TWINSPAN分类将该90个样地归并划分为15个群丛;DCA排序的第一轴的累积变异量为9.3%,前两轴的累积变异量为15.8%;CCA排序前两轴对物种-环境关系的解释量为62.6%;DCA、CCA排序分析揭示了群落在上、中、下游的分布情况,以及这些群落的分布格局与温度、人类干扰强度、土壤含水量等因子之间的相互关系。

Distribution Pattern of Plant Communities along the Riparian Zone of the Mainstream of Dongjiang River

Dongjiang River is one of the main inputs of Pearl River water system. Dongjiang Valley is one of the most developed areas of China, which supplies water for Hong Kong, Guangzhou, Shenzhen and other major cities. Based on the 90 quadrats data obtained from field investigation and using quantitative methods of TWINSPAN, DCA and CCA, the types and distribution pattern of plant communities along the riparian zone of the mainstream of Dongjiang River were studied in this paper to reveal the relationship between the communities and their habitats influenced by river section features. 271 species occurring in the 90 quadrats, belonging to 187 genera of 56 families, were recorded in the community investigation. Those 90 quadrats were classified into 15 associations by TWINSPAN according to the community characteristics in species composition and implied habitat differentiation. The first two axes of DCA explained 15.8% of cumulative variation. The first two axes of CCA explained 62.6% of cumulative variation of species-environment relation. The results of both DCA and CCA analyses revealed the distribution of the communities along Dongjiang upper reach, middle reach and lower reach sections with some special habitat features, showing strong influences of environmental factors on fostering the community distribution pattern. Those factors contributed to the formation of the community distribution pattern are mainly temperature, human disturbance and soil water regime.