升钟湖水体叶绿素a动态特征及其影响因子分析

2011—2015年每月监测升钟湖湖区的4个代表性断面的水质指标,分析水体中叶绿素a时空分布特征、变化规律及影响水体水质状况的其他要素。结果表明:升钟湖的叶绿素a具有显著性的年际差异,表现为夏季高、冬季低且呈现逐年下降的变化趋势,总磷、总氮、氨氮、溶解氧、透明度监测指标同样表现为夏季高、冬季低的变化趋势,除溶解氧和透明度的监测指标逐年上升外,其他监测指标均逐年下降。构建了叶绿素a与总氮、总磷的多元回归方程模型,该模型可根据水体营养盐状态准确预测升钟湖叶绿素a的变化趋势。

Spatio Temporal Variation of Water Quality and Identification of Eutrophication Controlling Factors in Shengzhong Lake

Caused by the problem of eutrophication,the water quality indicators of 4 representative sections of the Shengzhong Lake area were monitored monthly from 2011 to 2015,the spatial and temporal distribution characteristics of chlorophyll a content and its influencing factor were analyzed.The results showed that the chlorophyll a of Shengzhong Lake had significant interannual differences,showing high summer,low winter,and decrease year by year.The total phosphorus,total nitrogen,ammonia nitrogen,dissolved oxygen,and transparency also showed a trend of high in summer and low in winter.Except for dissolved oxygen and transparency were shows a tendency to increase year by year,other decrease year by year.Therefore,total phosphorus and total nitrogen were key limiting factors for eutrophication in Shengzhong Lake.Multiple regression equation model of chlorophyll a was constructed,which can accurately predict the change trend of chlorophyll a in Shengzhong Lake based on the state of nutrients in the water body.It has important science for the management and eutrophication of Shengzhong Lake Meaning and practical significance.