北戴河国家湿地公园水体主要污染物特征分析

Temporal and spatial distribution of main pollutants in Beidaihe National Wetland Park

为了解水系较为封闭的湿地水体主要污染物时空分布特征,2018年9,11月以及2019年3,5月分别对北戴河国家湿地公园水体水质进行了监测,分析其水质状况。评价结果表明:北戴河国家湿地公园水质总体为Ⅲ类水体;园区水体NH 3-N(0.497±0.429 mg/L)、TP(0.118±0.041mg/L)浓度较低,TN(1.53±0.61 mg/L)、COD(36±15 mg/L)浓度较高,TN和COD是水体污染的主要指标。时空分布评价结果表明:NH 3-N,TN,TP的浓度变化均表现为在合理利用区、恢复重建区、管理服务区依次递减的规律,而COD则表现为在合理利用区、管理服务区、恢复重建区呈递增趋势;NH 3-N含量在时间尺度上呈波动上升趋势;园区水体TN与TP变化趋势相似,均为先下降后上升;COD变化趋势为下降-上升-下降。相关性分析结果表明:水温和TP均与pH呈显著负相关;TN和DO呈极显著正相关;TP和TN含量呈显著正相关,说明TN和TP的来源相同,而其他水质指标间相关性不明显。

To explore the spatial and temporal distribution of main pollutants in Beidaihe National Wetland Park,the water quality was monitored in September and November in 2018,and March and May in 2019.The evaluation results showed that the water quality of Beidaihe National Wetland Park was Grade III.The concentration of NH 3-N(0.497±0.429 mg/L)and TP(0.118±0.041 mg/L)were low,while the concentration of TN(1.53±0.61 mg/L),COD(36±15 mg/L)were high,and TN and COD were the main indicators of water pollution.The spatial and temporal distribution results indicated that:the concentration of NH 3-N,TN and TP in the rational utilization area,the recovery reconstruction area and the management service area decreased,while the concentration of COD in the rational utilization area,the management service area and the recovery reconstruction area increased.The variation of NH 3-N content had a fluctuating increasing trend,the TN and TP content had a similar decreasing-increasing trend,and the COD content had a decreasing-increasing-decreasing trend in time scale.The results of correlation analysis showed that the water temperature and TP were negatively correlated with pH.TN and DO were positively correlated.TP and TN were positively correlated,indicating that the sources of TN and TP were the same,while the correlation between other water quality indicators were not obvious.