中国生态农业学报2017，Vol.25Issue(8)：1236-1244,9.DOI:10.13930/j.cnki.cjea.161187
府河-白洋淀硝酸盐来源判定及迁移转化规律
Sources, migration and transformation of nitrate in Fuhe River and Baiyangdian Lake, China
摘要
Abstract
The increasing urban sewage discharges have severely threatened the quality of surface water. Baiyangdian is the largest freshwater lake in the North China Plain, which plays a critical role in flood control, micro-climate regulation, improvement of eco-logical environment and development of aquaculture and tourism in the region. However, with rapid economic development and population growth in recent years, its' pollutant load has increased rapidly. Also eutrophication of water body caused by high nitrate concentration has created a significant problem. Excessive nitrate in water not only causes eutrophication, but also threatens human health. Therefore, the investigation of the sources of nitrate pollution and transformation in Fuhe River-Baiyangdian Lake area is important in order to provide a reference for the management of eutrophication and water quality. For the period 2008–2016, the variation in hydrochemical type as well as sources of nitrate in Fuhe River and Baiyangdian Lake surface water systems were inves-tigated by the combined use of hydrochemistry with isotopes (δ2H,δ18O andδ15N). The environmental behavior of NO3- along the river was evaluated using Cl- as the standard reference to estimate the dilution and mix of different waters in the study area. 1) If variation in measured NO3- was similar to calculated NO3-, then it implied that dilution and mix effects were the controlling factors for the change in NO3- in the river. 2) If the measured NO3- was smaller than calculated NO3-, it implied that apart from dilution and mix-ing, other processes such as biochemical reactions influenced the change in NO3-. 3) If also measured NO3- was larger than calculated NO3-, it implied that there was excess NO3- entering the river compared with Cl-. The results showed that in September 2008, NO3-δ15N in Fuhe River was higher than 10‰, with a range of 2.07‰–18.49‰ in July 2014. Domestic waste water from nearby villages was the dominant source of nitrate in Fuhe River. However, in June 2009, the range of NO3-δ15N was-3.7‰–4‰ and dis-charge of industrial waste water had a significant impact on nitrate concentration in the river in June 2009. In Baiyangdian Lake, the ranges of NO3-δ15N for September 2008 and July 2014 were 5.8‰–11.7‰ and 3.31‰–12.53‰, respectively. However, the range of NO3-δ15N for June 2009 was-3.8‰–0.7‰. Domestic and industrial waste water in Fuhe River were the main source of nitrate pollu-tion in Baiyangdian Lake. For 2008–2014, the proportion of Cl- and SO42-decreased gradually and the discharge of industrial waste-water and domestic sewage was controlled. In 2009, NO3- concentration in industrial waste water exceeded 50 mg·L-1. Then in 2014 and 2016, NO3- concentration fell below the standard. The spatial variation in nitrate concentration along the river was mainly af-fected by dilution, extra input of sewage and denitrification. In June 2011, the variation in nitrate concentration along the river was mainly affected by extra input of sewage. In June 2009, July 2014 and June 2016, denitrification impacted the decrease in concentra-tion of nitrate in Fuhe River when dissolved oxygen (DO) was less than 2 mg·L-1.关键词
府河-白洋淀流域/水质/水体富营养化/硝酸盐/氢氧同位素/氮同位素/水化学特征Key words
Fuhe River-Baiyangdian Lake Basin/Water quality/Water eutrophication/Nitrate/Hydrogen and oxygen isotope/Nitrogen isotope/Hydrochemical characteristics分类
资源环境引用本文复制引用
梁慧雅,翟德勤,孔晓乐,袁瑞强,王仕琴..府河-白洋淀硝酸盐来源判定及迁移转化规律[J].中国生态农业学报,2017,25(8):1236-1244,9.基金项目
国家自然科学基金项目(41471028)和中国科学院百人计划项目资助 This research was supported by the National Natural Science Foundation of China (41471028) and the Chinese Academy of Sciences Hundred Talents Project. （41471028）
