Denitrification occurring on suspended sediment in a large, shallow, subtropical lake (Poyang Lake, China)

Yao, Xiaolong; Zhang, Lu; Zhang, Yunlin; Xu, Hong‐Guang; Jiang, Xingyu

doi:10.1016/j.envpol.2016.05.073

Cited by 36 publications

(24 citation statements)

References 49 publications

(55 reference statements)

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“…We speculate that station 10 differs from other stations because of the large nutrient and suspended-particle loads from the Dapugang River, the second largest inflow into the lake (Yan et al, 2011). Suspended particles from sediments could trigger heterotrophic and anaerobic processes at station 10, including reduction of NO − 3 to NO − 2 Yao et al 2016). In fact, denitrification and anammox gene transcripts were observed recently in the water column at station 10 .…”

Section: Nitrificationmentioning

confidence: 99%

Nitrification and ammonium dynamics in Taihu Lake, China: seasonal competition for ammonium between nitrifiers and cyanobacteria

et al. 2018

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Abstract. Taihu Lake is hypereutrophic and experiences seasonal, cyanobacterial harmful algal blooms. These Microcystis blooms produce microcystin, a potent liver toxin, and are linked to anthropogenic nitrogen (N) and phosphorus (P) loads to lakes. Microcystis spp. cannot fix atmospheric N and must compete with ammonia-oxidizing and other organisms for ammonium (NH + 4 ). We measured NH + 4 regeneration and potential uptake rates and total nitrification using stable-isotope techniques. Nitrification studies included abundance of the functional gene for NH + 4 oxidation, amoA, for ammonia-oxidizing archaea (AOA) and bacteria (AOB). Potential NH + 4 uptake rates ranged from 0.02 to 6.80 µmol L −1 h −1 in the light and from 0.05 to 3.33 µmol L −1 h −1 in the dark, and NH + 4 regeneration rates ranged from 0.03 to 2.37 µmol L −1 h −1 . Nitrification rates exceeded previously reported rates in most freshwater systems. Total nitrification often exceeded 200 nmol L −1 d −1 and was > 1000 nmol L −1 d −1 at one station near a river discharge. AOA amoA gene copies were more abundant than AOB gene copies (p < 0.005) at all times; however, only abundance of AOB amoA (not AOA) was correlated with nitrification rates for all stations and all seasons (p < 0.005). Nitrification rates in Taihu Lake varied seasonally; at most stations, rates were highest in March, lower in June, and lowest in July, corresponding with cyanobacterial bloom progression, suggesting that nitrifiers were poor competitors for NH + 4 during the bloom.Regeneration results suggested that cyanobacteria relied extensively on regenerated NH + 4 to sustain the bloom. Internal NH + 4 regeneration exceeded external N loading to the lake by a factor of 2 but was ultimately fueled by external N loads. Our results thus support the growing literature calling for watershed N loading reductions in concert with existing management of P loads.

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Section: Nitrificationmentioning

confidence: 99%

Nitrification and ammonium dynamics in Taihu Lake, China: seasonal competition for ammonium between nitrifiers and cyanobacteria

et al. 2018

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“…Many scholars have studied nitrogen pollution in typical rivers, lakes and the marine environment [10][11][12][13], but information on the nitrogen transformation processes in high-altitude aquatic systems is still lacking. The Yarlung Zangbo River, the highest and longest plateau river in China, is under the influence of human activities [14,15].…”

Section: Introductionmentioning

confidence: 99%

Effects of Sulfamethoxazole and 2-Ethylhexyl-4-Methoxycinnamate on the Dissimilatory Nitrate Reduction Processes and N2O Release in Sediments in the Yarlung Zangbo River

Xue

2020

IJERPH

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The nitrogen pollution of rivers as a global environmental problem has received great attentions in recent years. The occurrence of emerging pollutants in high-altitude rivers will inevitably affect the dissimilatory nitrate reduction processes. In this study, sediment slurry experiments combined with 15N tracer techniques were conducted to investigate the influence of pharmaceutical and personal care products (alone and in combination) on denitrification and the anaerobic ammonium oxidation (anammox) process and the resulting N2O release in the sediments of the Yarlung Zangbo River. The results showed that the denitrification rates were inhibited by sulfamethoxazole (SMX) treatments (1–100 μg L−1) and the anammox rates decreased as the SMX concentrations increased, which may be due to the inhibitory effect of this antibiotic on nitrate reducing microbes. 2-Ethylhexyl-4-methoxycinnamate (EHMC) impacted nitrogen transformation mainly though the inhibition of the anammox processes. SMX and EHMC showed a superposition effect on the denitrification processes. The expression levels of the denitrifying functional genes nirS and nosZ were decreased and N2O release was stimulated due to the presence of SMX and/or EHMC in the sediments. To the best of our knowledge, this study is the first to report the effects of EHMC and its mixtures on the dissimilatory nitrate reduction processes and N2O releases in river sediments. Our results indicated that the widespread occurrence of emerging pollutants in high-altitude rivers may disturb the nitrogen transformation processes and increase the pressure of global warming.

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“…Bacterial denitrification and N removal rates have been estimated in several rivers and lakes. For example, denitrification rates were 0.25–0.63 mmol N·L −1 ·d −1 in Poyang Lake’s suspended sediments, 0–56.4 mg N·m −2 ·d −1 in sediments in the Taihu Basin and 274–2111 mg N·m −2 ·d −1 in the water of a Lake Superior estuary; N 2 O emission rates were 0.04–56.47 mg N·m −2 ·d −1 in urban rivers and 0.01–80.9 mg N·m −2 ·d −1 in runoff rivers; N 2 production rates ranged between 19.08 and 375.44 mg N 2 -N·m −2 ·d −1 in western Lake Taihu [ 11 , 12 , 13 , 14 , 15 ]. Processes contributing to N removal in water and sediments are affected by several environmental factors, including water temperature and concentrations of NO 3 − -N, dissolved oxygen (DO) and suspended solids [ 13 , 14 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Differences in Nitrogen Reduction Rates under Biotic and Abiotic Processes in River Water of the Taihu Basin, China

Guo

Wang

Guo

et al. 2018

IJERPH

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Understanding spatio-temporal differences in nitrogen (N) transformation, transport and reduction rates in water bodies is critical to achieve effective mitigation of river eutrophication. We performed culture experiments in six rivers in the Taihu Basin using a custom made in-situ experimental apparatus. We investigated spatio-temporal differences in reduce processes and rates of different N forms and assessed the contribution of biological processes to dissolved inorganic N (DIN) reduce. Results showed that biological processes played a major role in N reduction in summer, while non-microbial processes were dominant in winter. We observed significant spatial and temporal differences in the studied mechanisms, with reduction rates of different N compounds being significantly higher in summer and autumn than spring and winter. Reduction rates ranged from 105.4 ± 25.3 to 1458.8 ± 98.4 mg·(m3·d)−1 for total N, 33.1 ± 12.3 to 440.9 ± 33.1 mg·(m3·d)−1 for ammonium, 56.3 ± 22.7 to 332.1 ± 61.9 mg·(m3·d)−1 for nitrate and 0.4 ± 0.3 to 31.8 ± 9.0 mg·(m3·d)−1 for nitrite across four seasons. Mean DIN reduction rates with and without microbial activity were 96.0 ± 46.4 mg·(m3·d)−1 and 288.1 ± 67.8 mg·(m3·d)−1, respectively, with microbial activity rates accounting for 29.7% of the DIN load and 2.2% of the N load. Results of correlation and principal component analysis showed that the main factors influencing N processing were the concentrations of different N forms and multiple environmental factors in spring, N concentrations, DO and pH in summer, N concentrations and water velocity in autumn and N concentrations in winter.

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Denitrification occurring on suspended sediment in a large, shallow, subtropical lake (Poyang Lake, China)

Cited by 36 publications

References 49 publications

Nitrification and ammonium dynamics in Taihu Lake, China: seasonal competition for ammonium between nitrifiers and cyanobacteria

Nitrification and ammonium dynamics in Taihu Lake, China: seasonal competition for ammonium between nitrifiers and cyanobacteria

Effects of Sulfamethoxazole and 2-Ethylhexyl-4-Methoxycinnamate on the Dissimilatory Nitrate Reduction Processes and N2O Release in Sediments in the Yarlung Zangbo River

Spatio-Temporal Differences in Nitrogen Reduction Rates under Biotic and Abiotic Processes in River Water of the Taihu Basin, China

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