气候变化领域集成服务门户(CCPortal): Unexpectedly high nitrate levels in a pristine forest river on the Southeastern Qinghai-Tibet Plateau

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DOI	10.1016/j.jhazmat.2023.132047
	Unexpectedly high nitrate levels in a pristine forest river on the Southeastern Qinghai-Tibet Plateau
	Zhang, Wenshi; Jiang, Hao; Guo, Wenjing; Li, Shen; Zhang, Quanfa
发表日期	2023
ISSN	0304-3894
EISSN	1873-3336
卷号	458
英文摘要	River nitrate (NO3-) pollution is a global environmental issue. Recently, high NO3- levels in some pristine or minimally-disturbed rivers were reported, but their drivers remain unclear. This study integrated river isotopes (& delta;18O/& delta;15N-NO3- and & delta;D/18O-H2O), 15N pairing experiments, and qPCR to reveal the processes driving the high NO3- levels in a nearly pristine forest river on the Qinghai-Tibet Plateau. The river isotopes suggested that, at the catchment scale, NO3- removal was prevalent in summer, but weak in winter. The pristine forest soils contributed more than 90 % of the riverine NO3-, indicating the high NO3- backgrounds. The release of soil NO3- to the river was transport-limited in both seasons, i.e., the NO3- production/stock in the soils exceeded the capacity of hydrological NO3- leaching. In summer, this regime and the NO3--plentiful conditions in the soils associated with the strong NO3- nitrification led to the high riverine NO3- levels. While the in-soil nitrification was weak in winter, the leaching of legacy NO3- resulted in the consistently high NO3- levels. This study provides insights into the reasons for high NO3- levels in pristine or minimally-disturbed rivers worldwide and highlights the necessity to consider NO3- backgrounds when evaluating anthropogenic NO3- pollution in rivers.
关键词	Nitrate Isotope Source Background Qinghai-Tibet Plateau
英文关键词	DUAL-ISOTOPE APPROACH; UNCERTAINTY ANALYSIS; STABLE-ISOTOPES; NITROGEN; POLLUTION; WATER; IDENTIFICATION; NITRIFICATION; APPORTIONMENT; STREAMS
WOS研究方向	Engineering, Environmental ; Environmental Sciences
WOS记录号	WOS:001050494200001
来源期刊	JOURNAL OF HAZARDOUS MATERIALS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282702
作者单位	Chinese Academy of Sciences; Wuhan Botanical Garden, CAS
推荐引用方式 GB/T 7714	Zhang, Wenshi,Jiang, Hao,Guo, Wenjing,et al. Unexpectedly high nitrate levels in a pristine forest river on the Southeastern Qinghai-Tibet Plateau[J],2023,458.
APA	Zhang, Wenshi,Jiang, Hao,Guo, Wenjing,Li, Shen,&Zhang, Quanfa.(2023).Unexpectedly high nitrate levels in a pristine forest river on the Southeastern Qinghai-Tibet Plateau.JOURNAL OF HAZARDOUS MATERIALS,458.
MLA	Zhang, Wenshi,et al."Unexpectedly high nitrate levels in a pristine forest river on the Southeastern Qinghai-Tibet Plateau".JOURNAL OF HAZARDOUS MATERIALS 458(2023).