气候变化领域集成服务门户(CCPortal): Characteristics of Dissolved Organic Matter from a Transboundary Himalayan Watershed: Relationships with Land Use, Elevation, and Hydrology

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DOI	10.1021/acsearthspacechem.9b00329
	Characteristics of Dissolved Organic Matter from a Transboundary Himalayan Watershed: Relationships with Land Use, Elevation, and Hydrology
	Chen, Meilian; Zeng, Chen; Zhang, Fan; Kang, Shichang; Li, Chaoliu
通讯作者	Chen, ML (通讯作者)
发表日期	2020
ISSN	2472-3452
起始页码	449
结束页码	456
卷号	4 期号:3
英文摘要	Himalayan rivers play pivotal roles in regional water and food supplies, global sediments, and carbon budgets. We studied a transboundary mountainous Kosi River in the Himalayas by utilizing ultraviolet-visible spectroscopy and excitation-emission matrix coupled with parallel factor analysis. We have found that agricultural land use promoted the production of abundant proteinlike fluorescence in the surface waters [similar to 1.1-1.8 Raman unit (RU) for two proteinlike components that accounts for >= 97% of relative abundance] as opposed to natural vegetation land cover (e.g., forests and grasslands), despite the low dissolved organic carbon (DOC, 0.50-1.02 mg L-1), implying more reactive fluorescent dissolved organic matter (FDOM) that can potentially cause more CO2 outgassing. Furthermore, we observed a decreasing trend of slope ratio (S-R) and proteinlike fluorescence with elevation as opposed to a humiclike component, potentially due to more concentrated croplands and consequent nutrient inputs to rivers at lower elevations. In addition, poststorm samples shifted to more humiclike FDOM and chromophoric DOM (CDOM) sides compared to baseflow water. These findings highlighted the importance of land uses and other environmental conditions, such as elevation and hydrology, on DOM characteristics and dynamics and water quality, which can potentially be amplified due to the steep gradients in mountainous watersheds. Measures should be taken for proper and sustainable land uses to mitigate river water eutrophication and pollution and to protect drinking water sources for millions of populations.
关键词	RIVER FLUORESCENCE DYNAMICS CARBON BASIN GANGA
英文关键词	dissolved organic matter; EEM-PARAFAC; agricultural land use; hydrology; elevation; Himalayan mountainous rivers
语种	英语
WOS研究方向	Chemistry ; Geochemistry & Geophysics
WOS类目	Chemistry, Multidisciplinary ; Geochemistry & Geophysics
WOS记录号	WOS:000526379700011
来源期刊	ACS EARTH AND SPACE CHEMISTRY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259821
推荐引用方式 GB/T 7714	Chen, Meilian,Zeng, Chen,Zhang, Fan,et al. Characteristics of Dissolved Organic Matter from a Transboundary Himalayan Watershed: Relationships with Land Use, Elevation, and Hydrology[J]. 中国科学院青藏高原研究所,2020,4(3).
APA	Chen, Meilian,Zeng, Chen,Zhang, Fan,Kang, Shichang,&Li, Chaoliu.(2020).Characteristics of Dissolved Organic Matter from a Transboundary Himalayan Watershed: Relationships with Land Use, Elevation, and Hydrology.ACS EARTH AND SPACE CHEMISTRY,4(3).
MLA	Chen, Meilian,et al."Characteristics of Dissolved Organic Matter from a Transboundary Himalayan Watershed: Relationships with Land Use, Elevation, and Hydrology".ACS EARTH AND SPACE CHEMISTRY 4.3(2020).