AI Article Synopsis
- Macrof fauna, like the bivalve Corbicula fluminea, significantly influence pollutant exchange and nutrient cycling in sediment-water interfaces.
- In short-term experiments, their burrowing increases the release of ammonium (NH4+) and nitrate (NO3-) from sediments into the water.
- Over longer periods, these activities enhance nitrogen dynamics and organic matter breakdown, leading to greater NH4+ release into the overlying water.
Article Abstract
The macrofaunal activities exert intensive and extensive influences on the accumulation, transportation, exchange and geochemistry processes of pollutants and redox sensitive elements around the sediment-water interface. Based on the simulated and contrastive analysis method, effects of bivalve Corbicula fluminea activities on dissolved inorganic nitrogen (DIN) exchange between sediment-water interface in different experimental conditions and nitrogen biogeochemical cycling along the tidal flats of Yangtze River estuary are discussed. In short time experiment, Corbicula fluminea burrowing activities increased NH4+ release from sediments, and NO3- efflux to overlying water was much more in Corbicula fluminea inhabiting core. During long time incubation, NH4- and N released in turn from the sediments, bioturation can facilitate NH4- release from the sediments at the beginning of incubation, and stronger nmistrification derived from bioturbation witin the sediments enlarge Nsedim concentration. Disturbance and bioirrigation of Corbicula flumuminea can accelerate organic matter mineralization and N(DIN) exchange between overlying water and pore water, result in a larger release from NH4+ pool in top-sediment to overlying water. In conclusion, by means of excretion, burrowing, bioirrigation and biotuary ation, Corbicula fluuminea burrowing activities can evidently modify the nitrogen dynamics in sediment-water system.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
This case study of Kongsfjorden, western coastal Svalbard, provides insights on how freshwater runoff from marine- and land-terminating glaciers influences the biogeochemical cycles and distribution patterns of carbon, nutrients, and trace elements in an Arctic fjord system. We collected samples from the water column at stations along the fjord axis and proglacial river catchments, and analyzed concentrations of dissolved trace elements, together with dissolved nutrients, as well as alkalinity and dissolved inorganic carbon. Statistical tools were applied to identify and quantify biogeochemical processes within the fjord that govern the constituent distributions.
View Article and Find Full Text PDFBiotic Interaction Underpins the Assembly Processes of the Bacterial Community Across the Sediment-Water Interface in a Subalpine Lake.
Microorganisms
November 2024
Institute of Loess Plateau, Shanxi University, Taiyuan 030006, China.
The sediment-water interface is the most active region for biogeochemical processes and biological communities in aquatic ecosystems. As the main drivers of biogeochemical cycles, the assembly mechanisms and the distribution characteristics of microbial communities at this boundary remain unclear. This study investigated the microbial communities across the sediment-water interface in a natural subalpine lake in China.
View Article and Find Full Text PDFImmobilization or mobilization of heavy metal(loid)s in lake sediment-water interface: Roles of coupled transformation between iron (oxyhydr)oxides and natural organic matter.
Sci Total Environ
December 2024
Engineering Research Center of Watershed Carbon Neutralization, Ministry of Education, Nanchang University, Nanchang 330031, China; School of Resources and Environment, Nanchang University, Nanchang 330031, China. Electronic address:
Iron (Fe) (oxyhydr)oxides and natural organic matter (NOM) are active substances ubiquitously found in sediments. Their coupled transformation plays a crucial role in the fate and release risk of heavy metal(loid)s (HMs) in lake sediments. Therefore, it is essential to systematically obtain relevant knowledge to elucidate their potential mechanism, and whether HMs provide immobilization or mobilization effect in this ternary system.
View Article and Find Full Text PDFDiversity and Distribution of Methane Functional Microorganisms in Sedimentary Columns of Hongfeng Reservoir in Different Seasons.
Curr Microbiol
December 2024
Department of Environmental Science and Engineering, School of Environmental and Chemical Engineering, Shanghai University, 150#, 99 Shangda Road, Shanghai, 200444, China.
Freshwater ecosystem is a significant natural source of CH emission in the atmosphere. To fully understand the dynamics of methane emissions in reservoirs, it is essential to grasp the temporal and vertical distribution patterns, as well as the factors that influence the methanogenic bacterial communities within the sediments. This study investigates the methane dynamics, carbon isotope fractionation (δCH), and abundance of functional microorganisms along the geochemical gradient in the in situ sedimentary column of Hongfeng Reservoir (China).
View Article and Find Full Text PDFEnhanced pollution control using sediment microbial fuel cells for ecological remediation.
Bioresour Technol
December 2024
School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, PR China; National Local Joint Engineering Laboratory of Urban Domestic Wastewater Resource Utilization Technology, Suzhou 215009, PR China. Electronic address:
Sediment Microbial Fuel Cell (SMFC) technology is an innovative approach to facilitate the degradation of sedimentary organic matter by electroactive microorganisms, transforming chemical energy into electrical energy and modulating the redox potential at the sediment-water interface, consequently controlling the release of endogenous pollutants. The synergistic effects of various environmental factors and intrinsic conditions can significantly impact SMFC performance. This review provides a comprehensive overview of SMFC development in research and application for water environment treatment and ecological remediation, a perspective rarely explored in previous reviews.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!