闽江流域地表水质季节性变化特征研究

依据2007-2008年闽江流域11个断面不同季节地表水有机污染指标的跟踪监测数据，对闽江流域地表水质的季节性变化特征进行了初步研究。结果表明，地表水体中有机污染指标存在明显的季节性差异。COD浓度随季节变化以7月和11月较高，年内变化范围5.0 mg.L-1～28.0mg.L-1；NH+4-N浓度则1月、 3月较高，年内变化范围0.18 mg.L-1～2.97mg.L-1；TN和NO-2-N浓度均以11月较高，年内变化范围分别为0.81 mg.L-1～3.23mg.L-1和0.01 mg.L-1～0.15mg.L-1；TP浓度1月、11月较高。但COD、NH+4-N、NO-2-N、浓度均以9月较低。而且，COD、NH+4-N、NO-3-N 与TN；NH+4-N与TP之间存在显著正相关。相对而言，闽江流域水质随季节变化以秋季较好，冬、春季较差。

Seasonal Changes of surface water in Minjiang River

Based on monitoring data of pollutants in different seasons of the 11 spots in Minjiang River from 2007 to 2008, this paper preliminarily studied the seasonal changes of surface water. The results showed indicators of organic pollution of surface water varied with the season. The concentration of COD in July and November were highest through the year, and ranged from 5.0 mg/L to 28.0 mg/L during this year. The concentration of NH~4-N in January and March were highest, and the year. The concentration of TN and the concentration of ranged from 0.18 mg/L to 2.97 NO-2-N in November were mg/L during highest. The concentrations of TN ranged from 0.81 mg/L to 3.23 mg/L and the concentrations of NO-2-N ranged from 0.01 mg/L to 0.15 mg/L. The concentrations of TP were highest in January and November. But the concentration of COD, NH ~ 4-N and NO-z-N in September were lowest. Moreover, there are the very significant positive correlation Between COD, NH＋4-N, NO-2-N and TN, NH＊4-N and TP. Generally, Minjiang water was easily polluted in winter and spring, followed in autumn.