漳江水体营养盐含量季节变化特征分析

Seasonal variation characteristics of nitrogen and phosphorous nutrients in Zhangjiang River

本文以2010—2013年丰、平、枯水期漳江水流断面的水质监测数据为依据,分析漳江氮、磷营养盐含量特征及其季节变化规律。结果显示,漳江NO_3^--N含量范围为1.45~3.50 mg/L,NH_4^+-N含量范围为0.112~0.940 mg/L,NO_2^--N含量范围为0.030~0.188mg/L,PO_4^(3-)-P含量范围为0.005~0.143 mg/L,TN、TP含量范围分别为3.40~5.75、0.104~0.379 mg/L。漳江TN含量全年偏高,呈丰水期=平水期>枯水期的变化规律,受点源和面源的双重污染,以面源污染占主导。TP含量在枯水期和丰水期的变化无明显区别,受点源污染与面源污染交互作用。漳江NO_3^--N含量占漳江DIN总量的65.3%以上,是氮的稳定形态,不具有显著季节差异。漳江NH+4-N表现出枯水期高值的特征,主要来源于点源排放污染。PO_4^(3-)-P在枯、平、丰水期均有高值出现。漳江水体各营养盐因子在丰水期和枯水期表现出不同的相关性,在枯水期,NH+4-N、TP和TN三个因子间皆呈极显著正相关,NO_3^--N和PO_4^(3-)-P也表现出极显著正相关;雨季径流对各营养盐因子含量变化的影响则截然不同。

According to the investigation data on monitoring section in different water periods during 2010-- 2013, the composition and seasonal variation characteristics of nutrients in Zhangjiang River were studied. Results showed that the content ranges of NO3- - N, NH4 ＋- N, NO2- - N and PO3- 4- P were 1.45 -3.50, 0. 112 -0. 940, 0. 030 -0. 188 and 0. 005 -0. 143 mg/L, respectively. The content ranges of TN and TPwere 3.40 - 5.75 and 0. 104 in low - flow period and most - 0. 379 mg,/L, respectively. The annual average content of TN was high, lest in high - flow period, reflected that it was influenced by both point pollution and non - point pollution, dominated by the non - point pollution. Content of TP was no significant differences between low - flow period and high - flow period, because of the interaction of point pollution and non - point pollution. The main forms of the DIN was NO3- - N 〉 65.3% , which had no significant differences in differ- ent water periods. NH4 - N mainly came from point pollution, showed high value in the low - flow period. PO43 - -P had high value respectively in different water periods. The correlation analysis indicated that nutri- ent parameters had different correlation in different water periods. In low - flow period, there were signifi- cantly and positively correlated between NH4 - N, TP and TN. The significantly positive correlation was also observed between NO3- - N and PO43- - P. The influence of runoff on nutrient parameters was completely dif- ferent.