DOM Distribution and Nutrient Dynamics in Freshwater Systems

A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Water Quality and Contamination".

Deadline for manuscript submissions: 20 July 2024 | Viewed by 820

Special Issue Editor


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Guest Editor
Institute of Hydrobiology, Biology Centre of the Academy of Sciences of the Czech Republic, Ceske Budejovice, Czech Republic
Interests: photochemical degradation of DOM; influence of solar radiation on metals speciation; characterization of DOM

Special Issue Information

Dear Colleagues,

I would like to invite your contributions to the Special Issue of Water with the title “DOM Distribution and Nutrient Dynamics in Freshwater Systems”.

This Special Issue focuses on dissolved organic matter (DOM) plays a significant role in shaping biogeochemical processes and nutrient dynamics in freshwater ecosystems. DOM comprises a complex mixture of organic compounds derived from a variety of sources, including plant and animal wastes, microbial activities, and terrestrial runoff. Its distribution and interactions with nutrient cycles have profound implications for water quality, ecosystem functioning, and carbon cycling.

The distribution of DOM in freshwater systems is influenced by a variety of factors, including hydrology, land use, climate, and biological activity. Terrestrial inputs, such as leaf litter and soil leachate, contribute to the allochthonous pool of DOM in freshwater ecosystems. In contrast, autochthonous DOM is produced within the system by the metabolic activities of aquatic plants, algae, and microbes. DOM distribution can vary spatially and temporally, with factors such as water movement, temperature, and sediment transport, transformation, and accumulation in different zones of lakes, reservoirs, rivers, and wetlands.

DOM plays an important role in nutrient dynamics by mediating the availability, transport, and cycling of nutrients in freshwater ecosystems. It acts as both a source and sink for nutrients such as nitrogen (N) and phosphorus (P). DOM can bind nutrients, making them less accessible to primary producers, or serve as a substrate for microbial degradation, releasing nutrients to the water column.

This Special Issue summarises new insights into the DOM dynamic interaction and the implications for nutrient limitation, algal growth, and overall ecosystem productivity.

Sincerely,

Dr. Petr Porcal
Guest Editor

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Keywords

  • dissolved organic matter
  • phosphorus
  • nitrogen
  • lake
  • reservoir
  • nutrient dynamics
  • microbial processes

Published Papers (1 paper)

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Research

19 pages, 4992 KiB  
Article
Seasonal Freezing Drives Spatiotemporal Dynamics of Dissolved Organic Matter (DOM) and Microbial Communities in Reclaimed Water-Recharged River
by Jiaqi Zhao, Yang Huo, Zhiruo Zhang, Ying Zhang, Zhenlai Hou, Wei Fan, Zhi Geng and Mingxin Huo
Water 2024, 16(6), 906; https://doi.org/10.3390/w16060906 - 21 Mar 2024
Viewed by 605
Abstract
Although reclaimed water (RW) has become a promising alternative source for alleviating water shortage in arid and semiarid regions, the ecological risks it poses to the receiving water bodies remain largely unknown. Dissolved organic matter (DOM) is crucial for affecting the quality of [...] Read more.
Although reclaimed water (RW) has become a promising alternative source for alleviating water shortage in arid and semiarid regions, the ecological risks it poses to the receiving water bodies remain largely unknown. Dissolved organic matter (DOM) is crucial for affecting the quality of RW and strongly influences bacterial communities (BCs) in aquatic ecosystems. In this study, we aimed to unravel the role of DOM signatures on the spatiotemporal composition of microbial communities (MCs) in a seasonally ice-sealed urban river that had been chronically replenished by RW. We found that discharging RW resulted in elevated DOM levels in the receiving river. Notably, an increase of 10% in protein-like substances was revealed. The differences between compositional characteristics of DOM and the abundance of riverine BCs between freezing and non-freezing periods were revealed. In the freezing season, humic-like components, aromaticity, and hydrophobicity of DOM were more significant, and bacterial taxa such as Bacteriodetes and Flavobacterium were increased, while Proteobacteria was decreased. Similarly, co-occurrence network analysis revealed an enhanced interplay between DOM and BCs at the same time. However, Klebsiella pneumoniae markedly decreased during the ice-sealed period. These results suggest that variations in DOM characteristics have remarkable impacts on the dynamics of aquatic BCs, which points to the need for a DOM−oriented RW quality monitoring strategy. Full article
(This article belongs to the Special Issue DOM Distribution and Nutrient Dynamics in Freshwater Systems)
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