Laboratory of Riverine Ecological Conservation and Technology, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
Sci Total Environ. 2011 Aug 15;409(18):3394-402. doi: 10.1016/j.scitotenv.2011.05.030. Epub 2011 Jun 11.
A survey was conducted in the Haicheng River near Liaodong Bay to analyze the characteristics and sources of the in-stream nitrogen pollution throughout the year 2010. The results indicated that the total nitrogen (TN) concentrations in the river water all exceeded the GB3838-2002 standard for Class V guideline of 2.0 mg/l at all sampling sites during the sampling seasons. Ammoniacal nitrogen (NH₃-N) dominated TN during the spring season, while nitrate nitrogen (NO₃-N) dominated during the summer and autumn seasons. Different forms of nitrogen had significant seasonal variations (p<0.01 or p<0.05). Only NH₃-N and NO₃-N displayed distinct spatial differences at p<0.05 and p<0.001, respectively. Most forms of nitrogen were interrelated with physicochemical parameters during different seasons, displaying nitrification and denitrification processes that occurred in the river rather than seasonal biological demand. Based on the nitrogen parameters, the 30 sampling sites were divided into three clusters, by which the pollution sources from chemical nitrogen fertilizers, animal wastes, domestic sewage, and industrial wastewater were identified. Generally, the Haicheng River basin provided about 700tons of the annual TN flux, contributing to the eutrophication of the Liaodong Bay and Bohai Sea.
对辽东湾近岸海域海城河流域进行了调查，以分析 2010 年全年河流中氮污染的特征和来源。结果表明，在采样季节的所有采样点，河水总氮（TN）浓度均超过了 GB3838-2002 类 V 标准的 2.0mg/L。在春季，氨氮（NH₃-N）主导 TN，而在夏季和秋季，硝酸盐氮（NO₃-N）主导 TN。不同形式的氮具有显著的季节性变化（p<0.01 或 p<0.05）。仅 NH₃-N 和 NO₃-N 在 p<0.05 和 p<0.001 时分别表现出明显的空间差异。在不同季节，大多数形式的氮与理化参数相关，显示出在河流中发生的硝化和反硝化过程，而不是季节性的生物需求。基于氮参数，将 30 个采样点分为三个聚类，确定了来自化学氮肥、动物粪便、生活污水和工业废水的污染来源。总体而言，海城河流域每年提供约 700 吨 TN 通量，导致辽东湾和渤海的富营养化。
