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湖泊科学  2012 

洱海硅藻群落结构的时空分布及其与环境因子间的关系

DOI: 10.18307/2012.0311

Keywords: 硅藻,群落结构,环境因子,冗余分析,洱海

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Abstract:

于2004-2005年间对洱海水体的硅藻群落进行逐月监测及研究,共发现71个种,分属于18个属.硅藻群落结构的季节变化显著,主要优势种为耐营养的属种.不同季节的硅藻优势种类有明显区别,冬季的主要优势种为Fragilariacrotonensis,春季Aulacoseiraambigua与F.crotonensis的组合占优势地位,夏季以Cyclotellaocellata为主,秋季则A.ambigua与Cyclostephanosdubius组合为优势种.空间上除1#点外,硅藻分布虽然在相对丰度上存在一定的南北差异,但优势属种在全湖具有较好的一致性.说明洱海全湖的水质都已处于中富营养状态.对除1#点外的11个采样点的硅藻及水化学数据进行平均,得到逐月数据,通过数理统计分析的手段,探讨硅藻群落变化与环境因子之间的关系,结果表明影响季节尺度硅藻群落发生变化的最主要因子是气象条件,其次是营养盐.

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