生态与农村环境学报2016，Vol.32Issue(5)：802-807,6.DOI:10.11934/j.issn.1673-4831.2016.05.017
运用氮、氧双同位素技术研究永安江硝酸盐来源
Identification of Sources of Nitrate in the Yongan River With Isotopic Technology
摘要
Abstract
A case study of the Yongan River, a major inflow of the Erhai Lake, was conducted to identify sources of ni⁃trate⁃N in the river water with the d15 N⁃NO3-and d18 O⁃NO3-double isotope technique. Along the river, 9 monitoring sites were set up, responsible for characterizing nitrate pollution of the water, and measuring nitrate d15 N⁃NO3-and d18 O⁃NO3-in the water samples after treatment with ion exchange resin. Results show that the nitrate sources along the Yongan River are responsible for about 50% of the total nitrogen pollution load in the water. Nitrate concentration in the water samples at the monitoring sites varied in the range of 0�07-5�22 mg·L-1, with mean being in the range of 1�00-2�39 mg·L-1. The isotope test reveals that the mean d15 N⁃NO3- of the water samples at the monitoring sites ranged from 6�12‰ to 13�88‰, and the mean d18 O⁃NO3-did from 8�24‰to 11�72‰. The findings demonstrate that the nitrate pollutant in the river comes mainly from chemical fertilization, livestock manure, domestic sewage, and nitrification of organic nitrogen in the soil in the valley. Quantification of contributions of the four sources with the IsoSource mixing model tells that 37�3%was attributed to chemical fertilization, 34�6% to disposal of livestock manure, 18.2% to discharge of rural domestic sew⁃age and 9�9% to nitrification of organic nitrogen in the soil. The experiment shows that the use of the IsoSource mixed model to quantify sources of nitrate pollutant in the river may provide future studies with a new train of thought and that ra⁃tio of the contributions of the sources to the total nitrate pollutant in the river is related to location of the villages the river runs through and type of land use therein.关键词
永安江/硝酸盐污染/氮氧同位素/来源示踪/IsoSource模型/污染贡献率Key words
Yongan River/nitrate pollution/nitrogen and oxygen isotope/source tracing/IsoSource model/pollution contribution rate分类
资源环境引用本文复制引用
吴文欢,何小娟,吴海露,王欣泽,沈剑..运用氮、氧双同位素技术研究永安江硝酸盐来源[J].生态与农村环境学报,2016,32(5):802-807,6.基金项目
国家水体污染控制与治理科技重大专项（2012ZX07105－003）；上海交通大学青年教师启动计划 （）
