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

文献类型： 外文期刊

第一作者： Xiao, Yaxin

作者： Xiao, Yaxin;Xiao, Yaxin;Xiao, Yaxin;Wei, Chaoxian;Shan, Ying;Wang, Jinchuang;Wei, Chaoxian;Wang, Jinchuang;Wei, Chaoxian;Wang, Jinchuang;Shan, Ying;Wang, Qingfeng;Wang, Guiliang

作者机构：

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

期刊名称：ENVIRONMENTAL GEOCHEMISTRY AND HEALTH （ 影响因子：3.2； 五年影响因子：4.0 ）

ISSN： 0269-4042

年卷期： 2024 年 46 卷 9 期

页码：

收录情况： SCI

摘要： 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, NO3--N, Chl a, and NH4+-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.

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