气候变化领域集成服务门户(CCPortal): Nitrate dynamics in a forested catchment on the southeastern Tibetan Plateau: A study integrating natural-abundance isotopic, 15N pairing, and microbial molecular techniques

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DOI	10.1016/j.catena.2023.107033
	Nitrate dynamics in a forested catchment on the southeastern Tibetan Plateau: A study integrating natural-abundance isotopic, 15N pairing, and microbial molecular techniques
	Zhang, Wenshi; Jiang, Hao; Guo, Wenjing; Li, Shen; Zhang, Quanfa
发表日期	2023
ISSN	0341-8162
EISSN	1872-6887
卷号	225
英文摘要	The nitrate (NO3-) dynamics on the Tibetan Plateau, one of the most climatic sensitive regions on Earth, has not yet been well understood. This study synthesized natural-abundance isotopes, N-15 pairing techniques, and microbial functional genes to systematically elucidate the NO3- cycling dynamics as well as their biotic and abiotic driving mechanisms in a pristine forested catchment on the Tibetan Plateau. The river's natural-abundance isotopes showed that mineralization-nitrification of soil organic nitrogen was the major source of NO3- in the river, while significant NO3- removal occurred in the catchment. The N-15 pairing experiments support the river's isotopes and quantitatively showed that nitrification was prevalent in soil, but more than half of the nitrification-derived NO3- was removed. In turn, the river isotopes verified the representativeness of the in-soil processes in the catchment. Structural equation models suggested nitrification and denitrification (the major NO3- removal pathway) were largely regulated by microbial functional gene abundances, which in turn were regulated by varying abiotic factors. In addition, the fluvial NO3- export rates in the sub-catchments were significantly correlated with the river runoff, highlighting the role of hydrological conditions and associated soil leaching in regulating fluvial NO3- fluxes. This study shows that combining multi-disciplinary techniques can achieve a more comprehensive understanding of NO3- dynamics at the catchment scale.
关键词	Nitrogen Isotope N-15 pairing technique Molecular technique Tibetan Plateau
英文关键词	NITROGEN-CYCLE; CLIMATE-CHANGE; WATER; DENITRIFICATION; NITRIFICATION; RIVER; REDUCTION; ANAMMOX; RATES; TRANSFORMATIONS
WOS研究方向	Geosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS记录号	WOS:001011366800001
来源期刊	CATENA
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283825
作者单位	Tibet University; Tibet University; Chinese Academy of Sciences; Wuhan Botanical Garden, CAS; Chinese Academy of Sciences; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS
推荐引用方式 GB/T 7714	Zhang, Wenshi,Jiang, Hao,Guo, Wenjing,et al. Nitrate dynamics in a forested catchment on the southeastern Tibetan Plateau: A study integrating natural-abundance isotopic, 15N pairing, and microbial molecular techniques[J],2023,225.
APA	Zhang, Wenshi,Jiang, Hao,Guo, Wenjing,Li, Shen,&Zhang, Quanfa.(2023).Nitrate dynamics in a forested catchment on the southeastern Tibetan Plateau: A study integrating natural-abundance isotopic, 15N pairing, and microbial molecular techniques.CATENA,225.
MLA	Zhang, Wenshi,et al."Nitrate dynamics in a forested catchment on the southeastern Tibetan Plateau: A study integrating natural-abundance isotopic, 15N pairing, and microbial molecular techniques".CATENA 225(2023).