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湖泊科学  2012 

新安江水库(千岛湖)湖泊区夏季热分层期间垂向理化及浮游植物特征

DOI: 10.18307/2012.0319

Keywords: 新安江水库(千岛湖),浮游植物,垂向分布,Water-PAM,湖泊区

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Abstract:

2010年7月对亚热带特大型水库——新安江水库湖泊区水体的垂向物理、化学参数以及浮游植物群落进行了观测研究,并应用Water-PAM对水体浮游植物垂向光合作用参数进行了测定.研究结果表明:夏季该水库湖泊区在水下10~20m处形成明显的温跃层,垂向pH值、溶解氧及浊度的变化同叶绿素a浓度呈现高度一致;夏季浮游植物群落以硅藻占绝对优势,水体表层以梅尼小环藻(Cyclotellameneghiniana)为主,表层以下其它各层均以巴豆叶脆杆藻(Fragilariacrotonensis)为绝对优势种,垂向分布表现为5~10m区间为浮游植物高密度区域,温跃层以下浮游植物密度显著下降,水温分层可能是决定浮游植物垂向分布的重要因素之一.浮游植物最大光合效率从表层向下层逐步降低,实际光合效率最大值出现在垂向10m区域.

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