营养盐对天津市景观水体环境质量的影响

讨论了天津景观水体生态环境营养盐的污染特征、营养比例以及空间变化规律,分析了各水期营养盐变化及其对生态系统的影响,剖析了生态系统对胁迫因子的响应机理,分析了水体内部的生物代谢过程,及总磷和浮游生物的生长与气候、换水、降雨、沉积物、人为干扰之间的联系.结果表明：天津市景观水体出水口的营养盐含量高于上游来水;无机氮、总氮、可溶性磷酸盐、总磷全年变化规律为,丰水期〉平水期〉枯水期;天塔湖总氮、总磷的季节变化与河道相似,可溶性磷酸盐、无机氮季节变化与河道相反,丰水期低于平水期;与2000年改造之初相比,天津景观水体存在着富营养化加重的趋势.

Influence of Nutrient Salt on the Environmental Quality of Scenic Water Body in Tianjin

The pollution characters,nutrient proportion and content of spacial dynamic changes of the nutrient salt in scenic water body in 2004(in usual water periods) and in 2005(in low and high water period) in Tianjin city were discussed.The mechanism of stress factors acting to ecosystem,the contents of nutrient salt in every water period and its influence on ecosystem were analyzed.The biological metabolism process in water body,the effects of climate,water exchanging,rainfall,sediment,and jamming on the plankton growth and total phosphorus content were analyzed.The results showed that the nutrient salt content of the river way outlet was higher than that of upper reaches. The contents of inorganic nitrogen,total nitrogen,total phosphorus,soluble phosphate in high water period was higher than that in usual water period,and the later was higher than that in low water period.The seasonal change of contents of total nitrogen and total phosphorus in Tianta lake was similar to that in river,while the contents of inorganic nitrogen and soluble phosphate in high water period was lower than that in usual water period.The eutrophication in scenic water body was heavier comparing with that in 2000.