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The double-edged environmental effect of dissolved organic matter in global climate change
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This review analyzed how global climate change alters the structural properties and biogeochemical behavior of dissolved organic matter in terrestrial and aquatic ecosystems, with particular focus on how warming modifies DOM's role in carbon cycling, microbial processes, and interactions with aquatic organisms.
Dissolved organic matter (DOM) constitutes a core vector connecting organic carbon cycles in terrestrial and aquatic ecosystems, playing significant roles in various biogeochemical processes. Commencing from DOM quality variations, this review analyzes transformations in its structural properties (e.g., aromatic/aliphatic components, oxygen-containing functional groups, reactivity and stability) and biogeochemical processes (e.g., microbial and photochemical reactions and interaction with aquatic organisms) under global climate change with an emphasis on global warming. This study analyzes and synthesizes the current knowledge on climate-induced modifications to transport-transformation behaviors and bioavailability of environmental pollutants (heavy metals, organic pollutants, microplastics) governed by DOM, while assessing impacts of climate-driven DOM alterations on modulating functions in biological growth and metabolic processes, toxicological ramifications, and xenobiotic toxicity. Furthermore, DOM possesses a bidirectional climate feedback mechanism; its positive/negative feedback is dissected through carbon source-sink switching under climate change. The structural complexity of the DOM, together with the non-equilibrium state and multi-effect superposition characteristic of global climate change, collectively pose significant challenges to the accurate assessment of the climate feedback of DOM. Bidirectional environmental effects of DOM are critical for ecosystem functioning and human survival/development. Global climate change is altering the environmental effects of DOM by modifying its biogeochemical cycling; yet, current understanding remains constrained by system complexity. Systematic comprehension demands interdisciplinary collaboration to generate the necessary data for society to proactively mitigate climate change.
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Microplastic-derived dissolved organic matter and its biogeochemical behaviors in aquatic environments: A review
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This review examines how microplastics release dissolved organic matter (MP-DOM) as they break down in water, and how these released chemicals affect water ecosystems. MP-DOM can interact with other pollutants and alter carbon cycling in natural waters, with the type and amount varying based on plastic composition and weathering conditions. Understanding what microplastics release into water as they degrade is important because these dissolved chemicals may have their own toxic effects on aquatic life and water quality.
Impacts of climatic stressors on dissolved organic matter leaching from microplastics and their effects on biogeochemical processes: A review
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This review examines how microplastics release dissolved organic matter as they break down in the environment, and how climate change may accelerate this process. The chemicals leached from degrading plastics can disrupt microbial communities and natural nutrient cycles, potentially increasing greenhouse gas production and altering the ecosystems that ultimately support our food and water supplies.
Interactions between Microplastics and Dissolved Organic Matter in the Fresh Water Environment
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This review explores how microplastics interact with dissolved organic matter (DOM) — the complex mixture of carbon compounds found in rivers and lakes — and what that means for freshwater ecosystems. Microplastics readily bind to DOM, altering its distribution in sediments and affecting the microbial communities that depend on it for food and energy. DOM can also change how far microplastics travel and how available they are to aquatic organisms. The interplay between these two classes of contaminant complicates efforts to predict microplastic behavior in the environment.
From carrier to reactor: How microplastic as a mobile source of DOM reshapes soil carbon cycling and microbial communities
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This review summarizes existing research on how microplastics in soil interact with dissolved organic matter through physical, chemical and microbial processes. It describes microplastics forming surface biofilms and complexes that affect carbon breakdown, contaminant transport, and the loss of natural soil carbon.
Aging behavior of microplastics affected DOM in riparian sediments: From the characteristics to bioavailability
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Researchers examined how aging of microplastics in riparian sediments affects dissolved organic matter characteristics and bioavailability, finding that accumulated and weathered microplastics alter carbon cycling functions in these critical river-land interface zones.
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