Abstract

The species composition and structure of the plant communities along and in the fast-flowing streams on different bedrock types of the tropical mainland South-East Asia were investigated. The study was carried out in Peninsular Thailand, on the Nakhon Si Thammarat mountain range. A total number of 14 plots were placed within the five selected streams where vascular plants species had been collected, starting from November 2010 until July 2012. The estimation of the species was calculated by computer program EstimateS, and in order to distinguish plant communities, a cluster analysis was performed. A total number of 109 species of vascular plants has been recorded, with 59 species in the granite and 60 in the calcareous bedrock streams. There were four types of plant communities that had were categorized; of which three types occurred in the granitic bedrock streams and the other could be seen exclusively in the calcareous bedrock. It is convinced that the types of the bedrock as well as the topographic features of the streams might have major impact on the characterization of the plant communities.

中文摘要

本文研究了東南亞不同岩床類型的高速溪河流域內，其植物物種的組成與結構。研究地點為泰國洛坤府山區，並在5個溪流流域內設置了14個樣區，研究期間為2010年11月至2012年7月。本文使用軟體EstimateS來估算物種數量，植物群落的識別則使用群集分析。本文共記錄109種維管束植物，有50種生長於花崗岩岩床、69種生長於石灰岩岩床；共有4種植物群落被識別出來，其中3種生長於花崗岩床流域內、1種生長於石灰岩床流域。本研究之結果說明了河流流域之岩床類型，具有其地形學上的影響力來影響生長其上的植物群落組成。

Keyword: Plant community, stream, tropic.