磁湖叶绿素a的时空变化特征及其影响因子分析

Spatiotemporal characteristics of chlorophyll-a and its environmental factors in Cihu Lake

根据黄石市磁湖2015—2019年的水质监测数据,分析该湖泊叶绿素a时空变化特征并探究其影响因子.结果表明,磁湖叶绿素a浓度变化存在时空异质性.时间上,叶绿素a浓度在丰水期常高于枯、平水期;空间上,南磁湖叶绿素a浓度高于北磁湖,其中,南磁湖浓度最高值在西南部,北磁湖最高值在东北部.非度量多维尺度分析也表明,磁湖叶绿素a具有相同的时空特征.Pearson相关性分析表明,水温、总磷是影响磁湖叶绿素a的限制因子,有机污染物是重要驱动因子,透明度是被动因子.最后,对磁湖水生态修复提出了相关建议.

The spatiotemporal characteristics of chlorophyll-a(Chl.a)and the correlation between Chl.a and some influencing factors were analyzed in our work,based on the water quality monitoring data of Cihu Lake in Huangshi City from 2015 to 2019.The results showed that the variation of Chl.a concentration showed temporal and spatial changes.In the time dimension,the Chl.a concentration in flood season was higher than that in dry and normal season.The Chl.a concentration in the southern part of Cihu Lake was higher than that in the northern part.The highest concentration of the former appeared in the southwest part,and the latter appeared in the northeast part.Non-metric multi-dimensional scaling analysis also presented the differences among the different sites and the different water periods.Pearson correlation analysis showed that water temperature and total phosphorus might be the limiting factors affecting Chl.a.The organic pollutant was important driving factor for Chl.a,and transparency was the passive factor.Finally,this study put forward the regulation direction for the ecological restoration of Cihu Lake.