Analysis of delta N-15 and delta O-18 to identify nitrate sources and transformations in Songhua River, Northeast China

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	Analysis of delta N-15 and delta O-18 to identify nitrate sources and transformations in Songhua River, Northeast China
	Fu-Jun Yue; Cong-Qiang Liu; Si-Liang Li; Zhi-Qi Zhao; Xiao-Long Liu; Hu Ding; Bao-Jian Liu; Jun Zhong
刊名	Journal of Hydrology
	2014
卷号	519 期号:1 页码:329-339
关键词	Nitrate Dissolved Organic Nitrogen Dual Isotopes Songhua Rivers Nitrogen Flux
英文摘要	To understand the sources and transformations of nitrate in the Songhua River basin, which is one of seven largest river basins in China, the concentration of dissolved nitrogenous species, nitrogen and oxygen isotopes of NO3-, nitrogen isotopes of NH4+, and stable isotopes of water were determined in this study. Low NO3- concentrations and a high dissolved organic nitrogen/total dissolved nitrogen ratio (DON/TDN) were observed in the Nen River and other rivers originating from the mountains, which are covered by forest. NO3- and DON were the major nitrogenous compounds in aquatic systems, accounting for the TDN being about 90% during high flow season and about 85% during low flow season, respectively. The nitrogen efflux for the entire basin was estimated to be approximately 1.17 x 10(5) tons/yr, which represents an annual N output of 0.21 ton/(km(2) yr). The majority of the delta O-18-NO3- values were between -4 parts per thousand and 4 parts per thousand, reflecting nitrification. During the high flow season, the isotopic compositions of NO3- and the water chemistry suggest that NO3- in the Nen River was mainly derived from soil organic nitrogen (SON), whereas NO3- in the Songhua River originated from organic nitrogen, nitrogenous fertilizers and sewage waters. NO in the low flow season samples generally originates from SON and sewage waters. Moreover, the calculated loss of nitrate via the mass budget in rivers, together with isotopic values and water chemistry confirm that denitrification occurs during the high flow season, especially in the Songhua River. This study suggests that the mass calculation and isotopic proof provide a better understanding for riverine N budget and biogeochemical processes.
学科主题	环境地球化学
语种	英语
公开日期	2017-05-15
内容类型	期刊论文
源URL	[http://ir.gyig.ac.cn:8080/handle/352002/6009]
专题	地球化学研究所_环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Fu-Jun Yue,Cong-Qiang Liu,Si-Liang Li,et al. Analysis of delta N-15 and delta O-18 to identify nitrate sources and transformations in Songhua River, Northeast China[J]. Journal of Hydrology,2014,519(1):329-339.
APA	Fu-Jun Yue.,Cong-Qiang Liu.,Si-Liang Li.,Zhi-Qi Zhao.,Xiao-Long Liu.,...&Jun Zhong.(2014).Analysis of delta N-15 and delta O-18 to identify nitrate sources and transformations in Songhua River, Northeast China.Journal of Hydrology,519(1),329-339.
MLA	Fu-Jun Yue,et al."Analysis of delta N-15 and delta O-18 to identify nitrate sources and transformations in Songhua River, Northeast China".Journal of Hydrology 519.1(2014):329-339.