Insight into variation and controlling factors of dissolved organic matter between urban rivers undergoing different anthropogenic influences

Binessi Edouard Ifon; Bob Adyari; Liyuan Hou; Lanping Zhang; Xin Liao; Philomina Onyedikachi Peter; Azhar Rashid; Chang-Ping Yu; Anyi Hu

doi:10.1016/j.jenvman.2022.116737

Insight into variation and controlling factors of dissolved organic matter between urban rivers undergoing different anthropogenic influences

J Environ Manage. 2023 Jan 15;326(Pt B):116737. doi: 10.1016/j.jenvman.2022.116737. Epub 2022 Nov 17.

Authors

Binessi Edouard Ifon¹, Bob Adyari², Liyuan Hou³, Lanping Zhang⁴, Xin Liao⁴, Philomina Onyedikachi Peter⁴, Azhar Rashid⁵, Chang-Ping Yu⁶, Anyi Hu⁷

Affiliations

¹ CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; Laboratory of Physical Chemistry, University of Abomey-Calavi, Republic of Benin, 01 BP 4521 Cotonou, Benin.
² CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; Department of Environmental Engineering, Universitas Pertamina, Jakarta, 12220, Indonesia.
³ Department of Civil and Environmental Engineering, Utah State University, Utah, UT, 84322, USA.
⁴ CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.
⁵ Department of Environmental Sciences, The University of Haripur, Haripur, 22620, Pakistan.
⁶ CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.
⁷ CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Fujian Key Laboratory of Watershed Ecology, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China. Electronic address: ayhu@iue.ac.cn.

PMID: 36403459
DOI: 10.1016/j.jenvman.2022.116737

Abstract

Dissolved organic matter (DOM), known as a key to the aquatic carbon cycle, is influenced by abiotic and biotic factors. However, the compositional variation and these factors' effects on fluorescence DOM (FDOM) in urban rivers undergoing different anthropogenic pressure are poorly investigated. Herein, using fluorescence excitation-emission matrix and parallel factor analysis (EEM-PARAFAC), four FDOM components (C1, C2, C3, and C4) were identified in a less urbanized north river (NR) and a more urbanized west river (WR) of Jiulong River Watershed in Fujian province, China. C1, C2, and C4 were related to humic-like substances (HLS) and C3 to protein-like substances (PLS). HLS (63.9% in WR and 36.4% in NR) and PLS (62.7% in WR and 37.3% in NR) exhibited higher fluorescence in the more urbanized river. We also found higher PLS in winter, but higher HLS in summer for both rivers. Although the coefficient of variation indicated a difference in FDOM components stability to some extent between the two rivers, the typhoon event that occurred in summer had a stronger disruptive impact on the CDOM and FDOM of a more urbanized river than that of a less urbanized river. We explore abiotic and biotic factors' effects on FDOM using the partial least squares path model (PLS-PM). PLS-PM results revealed higher significant influences of biotic factors on FDOM in the more urbanized river. This study enhances our understanding of FDOM dynamics of rivers with different anthropogenic pressure together with the abiotic and biotic factors driving them.

Keywords: DOM; EEM-PARAFAC; Factors' effects; PLS-PM; Spatiotemporal variation; Urban rivers.

MeSH terms

China
Dissolved Organic Matter*
Factor Analysis, Statistical
Humic Substances / analysis
Rivers*
Seasons
Spectrometry, Fluorescence

Substances

Dissolved Organic Matter
Humic Substances