Implication of Nitrifying and Denitrifying Bacteria for Nitrogen Removal in a Shallow Lake

Wang, Fei; Zhao, Ying; Xie, Shulian; Jian-ying, LI

doi:10.1002/clen.201500319

Cited by 10 publications

(8 citation statements)

References 40 publications

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“…Temperature is a factor that positively influences denitrification rates, since it increases the growth of microbial populations in the summer or low rainfall periods [4]. Likewise, a correlation has been observed between temperature and abundance of denitrifying bacteria, assessed via a qPCR method, in a freshwater lakes and wetlands [5,6,22]. In these studies, the highest rates of denitrification, carried out by mesophilic microorganisms, were recorded in the summer and early autumn periods.…”

Section: Correlations Between Nutrients Physicochemical Variables and Abundance Of Cultivable Denitrifying Bacteriamentioning

confidence: 90%

“…All the isolates obtained possessed the capacity of aerobic denitrification and were heterotrophic. This is an important biochemical property of the selection of strains for the purification of the water column of lakes affected by rainbow trout farming, since these bacteria are known to facilitate the purification of the nitrate polluted surface water [11,22].…”

Section: Denitrifying Bacteriamentioning

confidence: 99%

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Denitrifying bacteria in the limnetic zone of Lake Tota, Colombia

Másmela-Mendoza

Forero

2021

Univ. Sci.

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The objective of study was to isolate and determine the identity of denitrifying bacteria from limnetic areas of Lake Tota (Colombian Andes) with and without rainbow trout production activities. We examined the relationships between the lake’s physicochemical factors (oxygen, nitrogen, and phosphorus content) and two bacterial communities (denitrifying bacteria and coliforms). Water samples were taken 20m below the surface from July to September at five limnetic zones; two of which were close to rainbow trout farming areas. In each zone, the concentrations of oxygen, nitrogen, and phosphorus were measured. To identify and quantify the abundance of bacteria, the most probable number (MPN) technique was used, employing minimal medium for denitrifying bacteria and medium for nitrate reducing bacteria (NRB). A greater number of denitrifying bacteria were found in the fish farming zones, identifying bacteria of the genera Bacillus, Pseudomonas, Nocardia, and Streptomyces. The number of nitrate-reducing bacteria revealed statistically significant differences throughout the sampling period, increasing from July to September and was related to a decrease in precipitation. The density of NRB and total phosphorus were directly correlated. High bacterial densities of denitrifyingbacteria and coliforms are indicative of changes from oligotrophic to eutrophic states in the studied limnetic areas.

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Section: Correlations Between Nutrients Physicochemical Variables and Abundance Of Cultivable Denitrifying Bacteriamentioning

confidence: 90%

Section: Denitrifying Bacteriamentioning

confidence: 99%

Denitrifying bacteria in the limnetic zone of Lake Tota, Colombia

Másmela-Mendoza

Forero

2021

Univ. Sci.

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“…Many studies have shown that reed littoral zones in large shallow lakes can reduce the aquatic nitrogen and phosphorus concentration through complex biochemical processes such as sedimentation, plant assimilation, and microbial denitri cation (Wang et al 2017). In contrast, large-scale enclosure shing in lakes increases nutrient concentrations and leads to water quality variations.…”

Section: Introductionmentioning

confidence: 99%

The spatial variations of water quality and effects of water landscape in Baiyangdian Lake, North China

Chen

Zhang

et al. 2021

Environ Sci Pollut Res

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Baiyangdian Lake (BYD), a large shallow lake in North China, has complex water landscape patterns that are underlies spatial variations in water quality. In this study, we collected 61 water samples from three water landscapes (reed littoral zones, sh ponds and open water) and analyzed them for water quality parameters, such as dissolved organic carbon (DOC), total nitrogen (TN), and total phosphorus (TP).Water landscape distribution (determined using remote sensing imagery) was then used to assess correlations between water quality parameters and water landscape proportion in differently scaled buffer zones. There was substantial variation across all subareas, with TN and TP concentrations ranging from 0.90-4.10 mg/L and 0.06-0.18 mg/L, respectively. Spatial variations in water quality were mainly caused by water landscape distribution and external nutrient inputs. There were negative correlations between DOC, TN, and TP concentrations and the area proportion of reed littoral zones in the 300 and 500 m buffers. In contrast, DOC, TN and TP concentrations were signi cantly positively correlated with the area proportion of sh ponds in the 100 m buffer. Furthermore, compared with reed littoral zones, a lower nitrogen to phosphorus ratio and a higher proportion of dissolved organic nitrogen and tyrosine-like proteins were found in sh ponds. These effects were mainly attributed to development of internal sediment loadings due to nutrient exchange between sediment and overlying water. Therefore, dredging-based sediment removal from sh ponds should be considered to suppress internal phosphorus loading and accelerate recovery of the BYD ecosystem.

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“…The submerged macrophytes can also affect the rhizosphere denitrifier abundance by secreting roots exudates, such as organic acids during the growth and change the rhizosphere micro-environments (Reilly et al, 2000). However, the impacts of the root exudates secreted by submerged macrophytes on the abundance of nirS-type denitrifiers and anammox bacteria in lakes as well as on the ecological relationship between these two microbe groups remain unclear (Wang et al, 2017). Therefore, the purpose of this study is to explore the relationship between organic acids secreted by submerged macrophytes and the abundance of nirS-type denitrifiers and anammox bacteria in the rhizospheres, and microcosm experiments were set up to investigate 1) if submerged macrophytes have impacts on the denitrifiers and anammox bacteria's communities in their rhizospheres, 2) if different macrophyte species have different impacts during their growth, and 3) the key drivers causing these impacts.…”

Section: Sediments 1 Introductionmentioning

confidence: 99%

The abundance of nirS-type denitrifiers and anammox bacteria in rhizospheres was affected by the organic acids secreted from roots of submerged macrophytes

et al. 2020

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The abundance of nirS-type denitrifiers and anammox bacteria in rhizospheres were affected by the organic acids secreted from roots of submerged macrophytes Abstract：Excessive nitrogen has been a global concern to cause lake eutrophication. The denitrification and anammox processes are considered to be effective biological pathways for nitrogen removal.Submerged macrophytes also play a key role in the nitrogen cycle of lakes. However, the mechanism of submerged macrophytes on regulating biological nitrogen removal pathways has not been well quantified.Therefore, this study investigated the impacts of submerged macrophytes on the community structures and abundance of the nirS-type denitrifiers and anammox bacteria in the rhizospheres. The qPCR results indicated that the abundance of two bacteria in the near-rhizospheres of submerged macrophytes were significantly lower than the root compartments and non-rhizospheres, while the concentrations of organic acids in the near-rhizospheres were higher than those of the root compartments and non-rhizospheres.The RDA results illustrated that concentrations of NO3 --N, NO2 --N, citric acid and oxalic acid were the key environmental indicators which had the significant impact on the microbial community. The concentrations of citric acid and oxalic acid were negatively correlated with the nirS-type denitrifiers abundance, and the oxalic acid concentrations were negatively correlated with the anammox bacteria abundance. These results indicated that submerged macrophytes could reduce the abundance of nirS-type denitrifiers and anammox bacteria by releasing organic acids. In addition, the highest diversity of denitrifier community were found in the rhizosphere of the Hydrilla verticillata, while the highest diversity of anammox community were found in the Potamogeton maackianus rhizosphere. These results indicate that the impacts of submerged macrophytes on the biological nitrogen removal pathways were species-dependent.

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Implication of Nitrifying and Denitrifying Bacteria for Nitrogen Removal in a Shallow Lake

Cited by 10 publications

References 40 publications

Denitrifying bacteria in the limnetic zone of Lake Tota, Colombia

Denitrifying bacteria in the limnetic zone of Lake Tota, Colombia

The spatial variations of water quality and effects of water landscape in Baiyangdian Lake, North China

The abundance of nirS-type denitrifiers and anammox bacteria in rhizospheres was affected by the organic acids secreted from roots of submerged macrophytes

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