刘家峡水库藻类群落特征与水质的关系

2009年—2010年，研究了刘家峡水库的藻类群落特征。共鉴定出8门11纲 16目33科55 属114种藻。丰水期优势类群是金藻门（占27%），次优势类群是硅藻门（21.5%）；枯水期优势类群是硅藻门，占总数34%（羽纹纲占33%），次优势类群是金藻门（18%）。对刘家峡水库水质初步评价结果显示：水库上游水质较清洁（1#—2#站点），中下游为轻度—偏中度污染（3#—4#站点），下游为中度—偏重度污染（5#—6#站点）。对藻类群落特征与6项水环境因子的Pearsong相关性分析表明，枯水期影响藻类群落特征的环境因子依次是DO﹥TN﹥pH值﹥T﹥Mcb(粪大肠杆菌)；丰水期则是DO﹥Mcb﹥pH值﹥TN。

Relationship between Characteristics of Algal Community and Water Quality in Liujiaxia Reservoir

Study of algal community characteristics in Liujiaxia Reservoir was carried out from July 2009 to March 2010.A total of 114 species were identified,belonging to 55 genera,33 families,16 orders,11 classes and 8 phyla.Bacillariophyta was dominant (34.0%) in dry season and subdominant (21.5%) groups in wet season.However,Chrysophyta was the dominant (27.0%) in the wet season and subdominant (18%) during the dry season.The water quality in Liujiaxia Reservoir was evaluated,based on the information from algal community characteristics and other relevant physiochemical parameters.The results showed that the quality of water from sampling sites 1# and 2# were undisturbed.There was light to middle degree of water pollution in sampling sites 3# and 4# and,heavier pollution in sites 5# and 6#.Correlation analysis for binary variables was carried out between the algal community structure and the major physiochemical parameters measured in this research.The result suggested that,in dry season,the major environmental factor that controlling the algal community structure was DO,followed by TN,pH,T and Mcb.Whereas,the primary controlling factor was same as DO,however,followed by Mcb,pH and TN in wet season.