潮水变化对北固山湿地水质影响研究

对镇江市北固山湿地潮水变化规律进行了研究,分析了湿地水质与潮水水深的相关关系,研究表明:湿地潮水在丰水期的日周期为1日2次涨落,其水位最大落差为1.59 m;随着潮水水位由高到低各采样点总氮、总磷和氨氮的浓度值由小变大,靠近排污口的1#采样点总氮、总磷和氨氮在低潮时的值分别是高潮时的2倍3、倍和2倍;2#采样点总氮、总磷和氨氮浓度值分别是高潮时的1.5倍、2倍和1倍。1#2、#点各指标值与潮水水深具有极显著的负相关关系,潮水水位的变化对其水质有显著影响;潮水水深与对照点的各项指标有负相关关系,但相关性并不显著,潮水的涨落对其水质没有显著影响;根据方差分析,随着采样点与排污口距离的增加,其水质各指标值显著下降,水质明显变好,这是潮水物理化学以及土壤、植物和生物综合作用的结果。

Impacts of tidal variation on water quality in Mount Beigu Wetland

The variation of tidewater in Mount Beigu Wetland in Zhenjiang City was studied.The relation between water quality in the wetland and tidewater depth was discussed.Results show that the wetland tide fluctuates twice a day in flood period,and the biggest fall of water level is 1.59m.The lower the tidewater level is,the higher the concentration of TN,TP,and NH3-N is.The concentration of TN,TP,and NH3-N is much higher in low tide than that in high tide, that is 2,3,and 2 times at sampling point 1# which is next to the outfall and 1.5,2,and 1 times at sampling point 2#.The concentration of the indices is negatively related to tidewater depth,and the influence of tidewater level on water quality is remarkable.The negative relevancy in contrast areas is less remarkable,and the rise and fall of tidewater does not influence the parameters obviously.With the increasing of distance from sampling point to outfall,the concentration of water quality parameters decreases obviously,and the water quality becomes better,which is the result of physical,chemical characteristics of tidewater and the contribution of soil,plants and biology.