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

	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
	2014
发表期刊	Journal of Hydrology
卷号	519 期号:1 页码:329-339
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.
关键词	Nitrate Dissolved Organic Nitrogen Dual Isotopes Songhua Rivers Nitrogen Flux
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/6009
专题	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.

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