Characterization of CDOM of river waters in China using fluorescence excitation-emission matrix and regional integration techniques

	Characterization of CDOM of river waters in China using fluorescence excitation-emission matrix and regional integration techniques
	Y. Zhao, K. S. Song, Y. X. Shang, T. T. Shao, Z. D. Wen and L. L. Lv
刊名	Journal of Geophysical Research-Biogeosciences
	2017
卷号	122 期号:8 页码:1940-1953
通讯作者	宋开山
中文摘要	The spatial characteristics of fluorescent dissolved organic matter (FDOM) components in river waters in China were first examined by excitation-emission matrix spectra and fluorescence regional integration (FRI) with the data collected during September to November between 2013 and 2015. One tyrosine-like (R1), one tryptophan-like (R2), one fulvic-like (R3), one microbial protein-like (R4), and one humic-like (R5) components have been identified by FRI method. Principal component analysis (PCA) was conducted to assess variations in the five FDOM components (F-Rl (l = 1, 2, 3, 4, and 5)) and the humification index for all 194 river water samples. The average fluorescence intensities of the five fluorescent components and the total fluorescence intensities F-SUM differed under spatial variation among the seven major river basins (Songhua, Liao, Hai, Yellow and Huai, Yangtze, Pearl, and Inflow Rivers) in China. When all the river water samples were pooled together, the fulvic-like F-R3 and the humic-like F-R5 showed a strong positive linear relationship (R-2 = 0.90, n = 194), indicating that the two allochthonous FDOM components R3 and R5 may originate from similar sources. There is a moderate strong positive correlation between the tryptophan-like F-R2 and the microbial protein-like F-R4 (R-2 = 0.71, n = 194), suggesting that parts of two autochthonous FDOM components R2 and R4 are likely from some common sources. However, the total allochthonous substance FR(3+5) and the total autochthonous substances FR(1+2+4) exhibited a weak correlation (R-2 = 0.40, n = 194). Significant positive linear relationships between F-R3 (R-2 = 0.69, n = 194), F-R5 (R-2 = 0.79, n = 194), and chromophoric DOM (CDOM) absorption coefficient alpha(254) were observed, which demonstrated that the CDOM absorption was dominated by the allochthonous FDOM components R3 and R5.
WOS记录号	WOS:000410174100004
内容类型	期刊论文
源URL	[http://ir.iga.ac.cn/handle/131322/7550]
专题	东北地理与农业生态研究所_湿地与全球变化学科组_期刊论文
推荐引用方式 GB/T 7714	Y. Zhao, K. S. Song, Y. X. Shang, T. T. Shao, Z. D. Wen and L. L. Lv. Characterization of CDOM of river waters in China using fluorescence excitation-emission matrix and regional integration techniques[J]. Journal of Geophysical Research-Biogeosciences,2017,122(8):1940-1953.
APA	Y. Zhao, K. S. Song, Y. X. Shang, T. T. Shao, Z. D. Wen and L. L. Lv.(2017).Characterization of CDOM of river waters in China using fluorescence excitation-emission matrix and regional integration techniques.Journal of Geophysical Research-Biogeosciences,122(8),1940-1953.
MLA	Y. Zhao, K. S. Song, Y. X. Shang, T. T. Shao, Z. D. Wen and L. L. Lv."Characterization of CDOM of river waters in China using fluorescence excitation-emission matrix and regional integration techniques".Journal of Geophysical Research-Biogeosciences 122.8(2017):1940-1953.