2012—2017年鄱阳湖水位变化与氮磷响应特征研究

Study on the response characteristics of nitrogen and phosphorus to water level change of Poyang Lake during 2012-2017

选取星子水文站作为鄱阳湖参考水位站,以2012—2017年水位、TN和TP监测数据为对象,采用相关分析和聚类分析探索鄱阳湖水位与氮磷之间的关系。结果表明:2012—2017年,鄱阳湖TN、TP浓度总体呈波动下降趋势;TN、TP年内呈周期性波动变化,枯水期TN、TP浓度较丰水期和平水期高,丰水期浓度最低;鄱阳湖水位与TN、TP呈显著负相关关系;水位、TN、TP的聚类分析结果表明,鄱阳湖6—8月为丰水期、4—5月和9月为平水期、10月至次年2月为枯水期,枯水期时间提前至10月,潘阳湖低水位、高氮磷浓度持续时间变长。

Taking Xingzi Hydrological Station as the reference water level of Poyang Lake,the paper collected the monitoring data of water level,TN and TP from 2012 to 2017 as objects,then analyzed the relationship between water level and nitrogen and phosphorus in Poyang Lake by correlation analysis and cluster analysis.The results showed that TN and TP concentrations generally showed a gradual downward trend from 2012 to 2017,while within one year,TN and TP fluctuated periodically.Besides,TN and TP concentrations in dry season were higher than in other seasons,and they were the lowest in wet season.Water level was negatively correlated with TN and TP.Based on the clustering analysis,wet season was from June to August,normal water level season contained April,May and September,dry season was from October to February of the following year.The dry season was advanced to October,and the period with low water level and high nitrogen and phosphorus concentrations became longer.