Effects of storm events on riverine dissolved organic matter:
a review
Ya Wang
School of Marine Sciences, Sun Yat-sen University, Zhuhai, 519082, China
DOM refers to dissolved organic matter in water bodies. It is commonly found in natural rivers and lakes, groundwater, wetlands and oceans. It has an important impact on the structure and function of aquatic ecosystems and the biogeochemical cycle of biogenic materials. In recent years, with the intensification of human activities, accelerated urbanization, and changes in land use types, rivers have received more and more input of pollutants, and their ecosystems and DOM cycles will be severely affected. Storm event is an important environmental event that affects river ecosystems and biogeochemical cycles. Although its duration is short, its high intensity will cause a large amount of terrestrial DOM and nutrients to quickly enter the river through surface runoff or undercurrent, thereby affecting the DOM of the river. Concentration, composition, and activity have a greater impact, thereby affecting river ecosystems and the output of riverine DOM to the ocean, then affecting the global carbon cycle. This article introduces that the main factors affecting the changes of DOM in rivers are input sources, hydrological conditions, biological conditions and land use patterns. The effects of current storm events on the concentration, composition, optical properties and activity of riverine DOM are summarized, and the response mechanism of riverine DOM to storm events is analyzed. Finally, the existing problems in current research and prospects are put forward.
Keywords：Dissolved organic matter, Storm events, River ecosystem, Carbon cycle
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