潘家口水库叶绿素-a分布及与理化因子的相关分析

通过多季节野外采样及分析研究，以叶绿素-a含量为指示参数描述潘家口水库藻类生物量多季节分布情况，分断面探究其影响因子组成，为研究水库水生态问题提供了基础支撑。结果表明：①除冬季外，叶绿素-a含量呈“U”型季节性变化，其浓度大小关系为春季＞秋季＞夏季，沿纵断面叶绿素-a含量呈梯级减少趋势，而垂向分布与水下温跃层变化存在显著相关性。②不同断面处影响叶绿素-a含量的理化因子有所不同，瀑河口断面的主要影响因子为pH值、总 磷、总氮、高锰酸盐指数；燕子峪断面为水温、溶解氧、氨氮；坝前断面为水温、总磷、高锰酸盐指数，其中磷是坝前叶绿素-a含量的最主要影响因子，仍需进一步探讨其他理化因子对叶绿素-a含量的影响。

Research of the Panjiakou Reservoir Chlorophyll-a distribution and its correlation analysis with physical and chemical factors

The distribution and the impact factors of the algal biomass of Panjiakou Reservior, in terms of chlorophyll-a (Chl-a), have been studied in this paper by multi-seasoned field sampling and laboratory analysis, which offers a basic support in researching reservoir ecological problems. The results show (a) that, apart from winter, the Chl-a concentration varied seasonally in a U-shaped form, the Chl-a concentration of spring appeared larger than that of autumn and that of autumn marked larger than that of summer, and (b) that phosphorus was the major impact factor influencing the Chl-a`s temporal changes, nitrogen was the major impact factor in terms of longitudinal changes, and the water temperature dominates the vertical changes of the Chl-a concentration. Different physical and chemical factors contribute to chlorophyll-a concentration at different sections with Baohekou section being pH, total phosphorus, total nitrogen and permanganate index, Yanziyu section being water temperature, dissolved oxygen and ammonia, Baqian section being water temperature, total phosphorus, potassium permanganate index. Especially, phosphorus is the major influencing factors at Baqian section. However, further exploration on other physical and chemical factors affecting the chlorophyll-a concentration needs to be developed.