氮、磷循环特征对水体富营养化影响分析

Effect of Nitrogen and Phosphorus Cycling Characteristic on Eutrophication of Water Body

通过对朱庄水库营养物质监测分析,氮含量比磷含量大几百倍。氮和磷都是造成水体富营养化的主要因子。由于受外界环境条件和水体性质的影响,外界污染源调查,氮污染源远远大于磷污染。水库水体溶解氧较大,pH值呈碱性,硝化作用的结果使水体中硝酸盐氮累计;同样的条件,导致不溶性磷的积累,大部分沉积于库底。水体富营养化条件是氮磷达到适合的比例,才会导致水华的爆发。该水库水体磷含量低,是抑制水体富营养化的关键。因此,该水库属于磷限制性水库。控制水库上游磷的排入量,可有效控制水体富营养化。

Analysis on nutrients monitoring of Zhuzhuang reservoir shows that nitrogen content is hundreds of times more than phosphorus.Nitrogen and phosphorus are both major causes of water eutrophication.Due to external environmental conditions and water properties,investigations on pollution sources show that nitrogen caused pollutions is much more than phosphorus.Reservoir water dissolves lots of oxygen,the PH value reflect on alkalescence,then by the reaction of nitrification,nitrate accumulated in water;In the same conditions,insoluble phosphorus is also accumulated,and most of them deposit at the bottom of reservoir.If nitrogen and phosphorus get to certain ratio in water,may cause the water eutrophication,then will lead to algae bloom outbreaks.So the low phosphorus content in reservoir water is crucial to curb eutrophication.Therefore,the reservoir is phosphorus restricted one.By control the phosphorus quantity comes from upper reaches can effectively control the eutrophication.