嘉陵江出口段藻类生长与氮磷相关性分析

为认识嘉陵江出口段藻类生长变化规律,运用相关分析方法探讨了藻类生长与氮磷之间的关系及其影响因素.结果表明:6～7月藻类处于快速增殖期;在相同气候条件、营养盐浓度差别不大的情况下,藻类细胞密度与水流速度反相关,缓流水域有利于藻类增殖;藻类细胞密度与氮磷浓度呈线性正相关,缓流水域中磷对藻类生长的影响权重大于氮的影响权重,表明磷为藻类生长限制因子,相对而言,缓流水域中磷对藻类的生长作用更强,藻类活动更活跃;流速大、泥量高、水温低等影响藻类与氮磷的相关性;涨水期藻类生长与氮磷相关性不明显.这为嘉陵江水质变化趋势研究及其富营养化发生条件、机理分析提供了重要参数.

Correlation of Algae Growth with Nitrogen and Phosphorus Concentrations at the Mouth of the Jialing River

Correlation analysis was used to evaluate the influencing factors and relationship of algae growth and nitrogen and phosphorus concentration in order to determine the algae growth change rule at the mouth of the Jialing River in Chongqing, P.R.China.The results indicate that algae grows rapidly during June and July.Under the same climate conditions and small differences of nutrient concentration,there is a negative correlation between algae cell density and flow velocity.Areas having tranquil water flows are advantageous for algae multiplication.Algae cell density has a positive linear relationship to nitrogen and phosphorus concentrations.Phosphorus has a greater influence weight than nitrogen,however,indicating that phosphorus is the restrictive factor for algae growth.Phosphorus affects algae growth more strongly in areas with tranquil water flows where the algae is more active.Fast flow velocity,abundant sediment content,low water temperature,and other factorss will affect the correlation of algae growth with nitrogen and phosphorus concentrations.This correlation is not obvious during rising flood stages.The results provide important parameters for understanding the changing water quality patterns of the Jialing River and the conditions and mechanism analysis of water eutrophication.