关键词: 漳江, 氮磷, 营养盐, 季节变化, Zhangjiang River, nitrogen and phosphor, nutrients, seasonal variation

Abstract: 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 PO43--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 TP were 3.40~5.75 and 0.104~0.379 mg/L , respectively. The annual average content of TN was high, lest in low-flow period and most 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 different 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 nutrient parameters had different correlation in different water periods. In low-flow period, there were significantly 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 different.