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Updated: Jul 1, 2025

Understanding Dissolved Organic Matter Biogeochemistry Through In Situ Nutrient Manipulations in Stream Ecosystems
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Photochemical processes transform dissolved organic matter differently depending on its initial composition.

Sheng-Ao Li1, Qianru Wang1, Hua Ma1

  • 1College of Environment and Ecology, Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, China.

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PubMed
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Dissolved organic matter (DOM) light exposure effects depend on its initial composition. Photobleaching and humification occur, altering DOM

Keywords:
Dissolved organic matterPhoto-humificationPhoto-transformationPhotobleachingReactive intermediates

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Area of Science:

  • Environmental Chemistry
  • Biogeochemistry
  • Photochemistry

Background:

  • Dissolved organic matter (DOM) is crucial to the global carbon cycle.
  • The molecular-level response of DOM to light is not well understood.
  • Key questions remain regarding photobleaching, photo-humification, and oxidative properties.

Purpose of the Study:

  • To investigate the molecular-level chemical response of aquatic DOM to light.
  • To determine how DOM composition influences its transformation under light.
  • To elucidate the roles of reactive intermediates in DOM photo-transformation.

Main Methods:

  • Exposure of aquatic DOM from diverse freshwater sources to realistic light conditions.
  • Analysis of DOM molecular composition and transformation pathways.
  • Assessment of the influence of reactive oxygen species (ROS) and excited state DOM autoxidation.

Main Results:

  • Photobleaching occurred in high-humic DOM, producing low H/C molecules.
  • Low-humic and algal DOM underwent humification, forming more unsaturated, high H/C molecules.
  • DOM transformation was influenced by reactive intermediates, with ROS dominant in high-humus conditions.
  • Algal DOM transformation was primarily driven by excited state DOM autoxidation.

Conclusions:

  • DOM photo-transformation patterns are strongly dependent on initial molecular composition.
  • Photochemical processes significantly impact DOM bioavailability and biogeochemical cycling.
  • Understanding these light-driven transformations is key to predicting carbon cycle dynamics.