Spatiotemporal response of the optical characteristics of dissolved organic matter to seasonality and land use in tropical island rivers.

Publisher: Kluwer Academic Publishers Country of Publication: Netherlands NLM ID: 8903118 Publication Model: Electronic Cited Medium: Internet ISSN: 1573-2983 (Electronic) Linking ISSN: 02694042 NLM ISO Abbreviation: Environ Geochem Health Subsets: MEDLINE

Publication: 1999- : Dordrecht : Kluwer Academic Publishers
Original Publication: Kew, Surrey : Science and Technology Letters, 1985-

Seasons* ; Rivers*/chemistry ; Environmental Monitoring*/methods; China ; Islands ; Tropical Climate ; Spatio-Temporal Analysis ; Humic Substances/analysis ; Agriculture ; Organic Chemicals/analysis ; Benzopyrans/analysis

Dissolved organic matter (DOM), a pivotal component in the global carbon cycle, plays a crucial role in maintaining the productivity and functionality of aquatic ecosystems. However, the driving factors of variations in the properties of riverine DOM in tropical islands still remain unclear. In this study, the spatiotemporal response of the optical characteristics of riverine DOM to seasonality and land use on Hainan Island in southern China was investigated. Our results revealed that DOM in the rivers of Hainan Island exhibited a relatively high proportion of fulvic acid and demonstrated strong terrestrial sources. The optical properties of DOM exhibited significant variations both seasonally and spatially. Land use exerted a dominant influence on riverine DOM. Specifically, during the wet season, riverine DOM exhibited larger molecular weight, increased chromophoric DOM (CDOM) abundance, and higher Fmax compared to the dry season. Furthermore, riverine DOM influenced by grassland and farmland showed higher CDOM abundance, Fmax, and humification degree in contrast to those impacted by forest and urban. Random forest and correlation analysis results indicated that grassland and farmland enhanced the Fmax of DOM by increasing levels of TP, NO 3 ^- -N, Chl a, and NH 4 ⁺ -N in the dry season. However, during the wet season, the increased Fmax of DOM induced by grassland and farmland relied on the increments of Chl a and TP concentrations. This study improves our understanding of the spatiotemporal fluctuations of DOM in the rivers of Hainan Island, highlighting the effects of season and land use on DOM. It offers valuable support for improving water quality and contributes to enhancing human comprehension of the global carbon cycle.
(© 2024. The Author(s), under exclusive licence to Springer Nature B.V.)

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322QN363 Hainan Provincial Natural Science Foundation of China; No.32171771, 31870616 National Natural Science Foundation of China; No. 1630042023002 Central Public-interest Scientific Institution Basal Research Fund for Innovative Research Team Program of CATAS

Keywords: Dissolved organic matter (DOM); Land use; Optical properties; Seasonal variation; Spatiotemporal variations; Tropical Island rivers

0 (Humic Substances)
0 (Organic Chemicals)
0 (Benzopyrans)
XII14C5FXV (fulvic acid)

Date Created: 20240729 Date Completed: 20240729 Latest Revision: 20240906

20240906

10.1007/s10653-024-02131-y

39073511