Salt intrusion alters nitrogen cycling in tidal reaches as determined in field and laboratory investigations

Xie, Rongrong; Rao, Poduri S.R.S.; Pang, Yong; Shi, Chengchun; Li, Jiabing; Shen, Dandan

doi:10.1016/j.scitotenv.2020.138803

Cited by 17 publications

(10 citation statements)

References 55 publications

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“…The Min River is the largest single river flowing into the sea in Fujian Province, China (541 km) [ 17 , 26 ]. The lower reaches of the Minjiang River, with 117 km from the Shuikou Dam to coastal outfall, is located in the Minjiang watershed between 25°55′–26°18′ N and 118°48′–119°40′ E ( Figure 1 ).…”

Section: Methodsmentioning

confidence: 99%

Influence of Riverbed Incision and Hydrological Evolution on Water Quality and Water Age Based on Numerical Simulation: A Case Study of the Minjiang Estuary

Zhang

Wang

et al. 2021

IJERPH

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In recent years, problems such as water quality deterioration, saltwater invasion, and low oxygen have appeared in estuaries all over the world. The Minjiang River in Fujian, as a typical tidal estuary area, is facing these thorny problems. In this paper, the effects of topography and hydrologic evolution on the water age and water quality of the lower reaches of the Minjiang River were simulated by building a hydrodynamic and water quality model. The results show that: (1) It was found that the riverbed incision of the lower reaches of the Minjiang River led to the overall decline of river water level, the increase of river volume, and the increase of downstream water age, which eventually led to the decrease of dissolved oxygen (DO) and the deterioration of water quality in the downstream from Shuikou to Baiyantan. However, the decline of topography led to the increase of tidal volume in the estuary, the enhancement of the dilution effect of oxygen-rich water bodies in the open sea, and the increase of DO in the lower reaches of Baiyantan. (2) Under no tidal action, the concentration of pollutants in the water of the North Channel increased, the DO decreased, and the DO decreased from Baiyantan to the offshore water. After the enhancement of tidal action, the dilution of oxygen-enriched water from the offshore water increased, and the DO increased. (3) The hydrological and water quality characteristics of the upper part of the lower reaches of the Minjiang River were mainly controlled by topography, runoff, and pollutant discharge, which were more affected by the tidal current transport operation and pollutant discharge near the open sea. In recent decades, the deterioration of water quality and the aggravation of saltwater intrusion in the Minjiang River were closely related to the serious topographic downcutting. The results provide a scientific basis for revealing the deterioration of estuary water quality and long-term management of the estuary.

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Section: Methodsmentioning

confidence: 99%

Influence of Riverbed Incision and Hydrological Evolution on Water Quality and Water Age Based on Numerical Simulation: A Case Study of the Minjiang Estuary

Zhang

Wang

et al. 2021

IJERPH

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“…The three studies mentioned above addressed how pulse disturbances (i.e., disturbances occur in a single event and over a short period of time) impacted community outcome, as bacterial communities experienced changes in salinity once. However, study IV investigated the role of a press disturbance (i.e., disturbances occur in multiple events and impact multiple generations of community members) influencing nitrogen transformation [9] . This assessment was critically important given Minjiang River closely links to drinking water availability in many coastal regions, particularly under climate change scenarios.…”

Section: Study Iv: the Quantification Of Functional Genesmentioning

confidence: 99%

“…These result in multiple niches harboring microorganisms that differ in their ecological strategies and functional traits. In this Highlights, I synthesized the methods and major findings of the four studies that explored the community assembly processes, dynamics and functional consequences of aquatic bacterioplankton subjected to changes in the surrounding environment in laboratory setting [6] , [7] , [8] , [9] . The four published studies were chosen because of similarity in experimental setting.…”

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confidence: 99%

Understanding response of microbial communities to saltwater intrusion through microcosms

Shen

2021

Computational and Structural Biotechnology Journal

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A central pursuit of microbial ecology is to accurately describe and explain the shifts in microbial community composition and function that occur in response to environmental changes. This goal requires a thorough understanding of the individual responses of different species and of the processes guiding the assembly of microbial populations similar in their response traits and corresponding functional traits. These research topics are addressed and synthesized in this Highlights, in four studies applying a trait-based framework to assess how environmental change affected the composition and functional performance of bacterioplankton of natural origin in microcosm experiments. The salinity of many aquatic environments is currently changing, due to climate change and anthropogenic activities. The mechanisms by which salinity influences community assembly, functional redundancy and functional genes involved in nitrogen cycle, and how dispersal modifies community outcome are explored in the four studies. Together, the findings of these case studies demonstrate the feasibility of using novel experiments in combination with integrative analyses of 16S rRNA and meta-‘omic’ data to address ecological questions. This combined approach has the potential to elucidate both the processes contributing to bacterial community assembly and the possible links between the compositional and functional changes that occur under shifting environmental conditions.

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“…Climate perturbations are increasing and understanding how ecosystem functions change, together with the responses of microbial communities through the biogeochemical pathways after these perturbations, must be examined. Several studies have shown that saltwater intrusion can alter the biogeochemical functioning of wetlands [ 12 , 13 , 14 , 15 ]. Monitoring the responses of microbial communities across various environments allows for a more holistic picture of the effects disturbances have on ecosystems [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Salinity Impacts the Functional mcrA and dsrA Gene Abundances in Everglades Marshes

et al. 2023

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Coastal wetlands, such as the Everglades, are increasingly being exposed to stressors that have the potential to modify their existing ecological processes because of global climate change. Their soil microbiomes include a population of organisms important for biogeochemical cycling, but continual stresses can disturb the community’s composition, causing functional changes. The Everglades feature wetlands with varied salinity levels, implying that they contain microbial communities with a variety of salt tolerances and microbial functions. Therefore, tracking the effects of stresses on these populations in freshwater and brackish marshes is critical. The study addressed this by utilizing next generation sequencing (NGS) to construct a baseline soil microbial community. The carbon and sulfur cycles were studied by sequencing a microbial functional gene involved in each process, the mcrA and dsrA functional genes, respectively. Saline was introduced over two years to observe the taxonomic alterations that occurred after a long-term disturbance such as seawater intrusion. It was observed that saltwater dosing increased sulfite reduction in freshwater peat soils and decreased methylotrophy in brackish peat soils. These findings add to the understanding of microbiomes by demonstrating how changes in soil qualities impact communities both before and after a disturbance such as saltwater intrusion.

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Salt intrusion alters nitrogen cycling in tidal reaches as determined in field and laboratory investigations

Cited by 17 publications

References 55 publications

Influence of Riverbed Incision and Hydrological Evolution on Water Quality and Water Age Based on Numerical Simulation: A Case Study of the Minjiang Estuary

Influence of Riverbed Incision and Hydrological Evolution on Water Quality and Water Age Based on Numerical Simulation: A Case Study of the Minjiang Estuary

Understanding response of microbial communities to saltwater intrusion through microcosms

Salinity Impacts the Functional mcrA and dsrA Gene Abundances in Everglades Marshes

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