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湖泊科学  2015 

江西柘林湖富营养化现状与藻类时空分布特征

DOI: 10.18307/2015.0211

Keywords: 良好湖泊,柘林湖,藻类演替,蓝藻水华,生态安全,饮用水安全

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Abstract:

江西柘林湖是首批入围国家良好湖泊保护专项的示范湖泊.为揭示柘林湖富营养化现状与藻类时空演替特征,于2012年8月至2013年7月对全湖及主要入湖支流进行了周年采样分析,结果表明:柘林湖主要营养盐在地表水Ⅲ类以内,处于中营养状态.全湖藻类演替以蓝藻-硅藻交替为主,夏季以鱼腥藻和微囊藻为优势种,冬季直链藻、小环藻和针杆藻占优.藻类空间分布呈现西部高于东部、上游高于下游的特征,西部部分湖区夏季甚至出现了鱼腥藻水华.柘林湖3个大型饮用水源地中东渡水源地夏季也同样面临蓝藻水华问题,但蓝藻毒素未超标.在重点监测的4条柘林湖主要入湖支流中,3条支流的藻类夏、冬季细胞丰度均在1×107cells/L以下,但烟港水的藻细胞丰度夏、冬季分别接近和超过该界限,应加以警惕并采取适当措施.枯水期水位变化、水体分层、较低的水体透明度和较长的滞留时间是影响柘林湖局部湖区蓝藻水华形成的关键因素.

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