探討磺溪流域底棲矽藻群集與水質之關係

Correlation between Benthic Diatom Community and Water Quality in the Huangxi Drainage Area

本研究於2015年4月至12月調查台灣北部大屯山磺溪溫泉主流及支流共5個樣站底棲矽藻組成。總計4次採樣共鑑定出38屬88種底棲矽藻，群集分析結果其矽藻組成分為4群，磺溪主流與支流藻種組成有明顯之分群。矽藻群集與水質因子進行多元尺度分析的結果發現溫度、溶氧量、pH值與氨氮濃度對藻種呈現正影響，其中pH值對藻種的組成影響最為明顯。水體的導電度值及濁度則是對藻種組成呈現為負影響。結果顯示受溫泉影響的酸性水域會限制藻種的生存，由矽藻組成與環境分析的結果來看，Eunotia及Pinnularia屬可以成為酸性水質的指標物種。 Benthic diatom communities and water quality were investigated at a total of 5 sample sites along the Huangxi mainstream (three sample sites) and two branches (two sample sites) in northern Taiwan from April to December 2015. A total of 88 species belonging to 38 genus of benthic diatoms were identified in the Huangxi drainage area. Diatom communities were classified into five groups by cluster analysis. The results of cluster analysis indicated that diatom communities were clearly separated between the Huangxi mainstream and branches. The correlation between benthic diatom community and water quality was examined by multidimensional scaling (MDS). The results pointed out water temperature, dissolved oxygen, pH value and ammonia nitrogen were positive effects with diatom communities, and pH value was the main affecting factor on diatom communities. On the other hand, conductivity and turbidity were negative correlations with diatom communities. The results indicated that acidity of hot spring might constrain diatom communities, and Eunotia and Pinnularia could be indicator genus of acidic fresh-water.

Benthic diatom communities and water quality were investigated at a total of 5 sample sites along the Huangxi mainstream (three sample sites) and two branches (two sample sites) in northern Taiwan from April to December 2015. A total of 88 species belonging to 38 genus of benthic diatoms were identified in the Huangxi drainage area. Diatom communities were classified into five groups by cluster analysis. The results of cluster analysis indicated that diatom communities were clearly separated between the Huangxi mainstream and branches. The correlation between benthic diatom community and water quality was examined by multidimensional scaling (MDS). The results pointed out water temperature, dissolved oxygen, pH value and ammonia nitrogen were positive effects with diatom communities, and pH value was the main affecting factor on diatom communities. On the other hand, conductivity and turbidity were negative correlations with diatom communities. The results indicated that acidity of hot spring might constrain diatom communities, and Eunotia and Pinnularia could be indicator genus of acidic fresh-water.