Microbial bioavailability of dissolved organic nitrogen (DON) in the sediments of Lake Shankou, Northeastern China

Su, Mingzhou; Zhang, Jingtian; Huo, Shouliang; Xi, Beidou; Fei, Hua; Zan, Fengyu; Qian, Guangren; Liu, Jianyong

doi:10.1016/j.jes.2015.08.011

Cited by 13 publications

(4 citation statements)

References 49 publications

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“…Tyrosine-like proteins are mainly related to aromatic protein-like structures generated from microbial degradation, whereas tryptophan-like proteins are mainly related to aromatic amino acid structures and degradation products of lignin [50]; and (iii) Peak C was observed at Ex/Em values of 270–280/420–430 nm, which was thought to be generated mainly by humic acid-like substances with complex molecular structures [51], this substance is usually considered as nondegradable fractions for its complex and stable structure with aromatic ring and covalent bond. The result was similiar to Su et al’s [52] research results on EEMs of KS-DON in Shankou Lake, which two types of protein-like substances and one FA-like substance were observed at Ex/Em values of 225–275/350, 275/240–350 and 250/400–410.…”

Section: Resultssupporting

confidence: 84%

“…From the above, we concluded that KS-DON in Taihu Lake source sediments is mainly composed of hydrophilic and small molecular components, while the fluorescence spectrum of KS-DON shows high protein fluorescence. Based on the analysis of Zhai et al [12,14,52,55], it is concluded that the sediment KS-DON in Taihu Lake source area has higher bioavailability and higher risk of endogenous release. In addition, higher NH 4 + -N loads also exist in sediments, which should be paid attention to.…”

Section: Resultsmentioning

confidence: 99%

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Characteristics of Dissolved Organic Nitrogen in the Sediments of Six Water Sources in Taihu Lake, China

Yang

Wei

et al. 2019

IJERPH

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KCl-extractable sediment dissolved organic nitrogen (KS-DON) extracted from sediments near drinking water intakes of six drinking water sources in Taihu Lake in China was partitioned into hydrophobic and hydrophilic fractions and high/low molecular weight fractions. The results showed that the total dissolved nitrogen (TDN) contents of the extracts ranged from 67.78 to 128.27 mg/kg. KS-DON was the main TDN species, accounting for more than 50%, with NH4+-N and NO3−-N averaging 30% and 20%, respectively. The molecular weight fractions of <1 kDa accounted for almost half of KS-DON. Hydrophilic compounds accounted for more than 75% of KS-DON. Three fluorescence peaks were identified: soluble microbial byproducts (A); protein-like substances (B); and humic acid-like substances (C). It is concluded that the KS-DON in Taihu Lake sources has higher bioavailability and higher risk of endogenous release. Ecological dredging and establishment of constructed wetlands are possible measures to reduce the release of endogenous nitrogen.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Characteristics of Dissolved Organic Nitrogen in the Sediments of Six Water Sources in Taihu Lake, China

Yang

Wei

et al. 2019

IJERPH

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“…Before stocking and harvest, 30 specimens of P. vannamei, S. guttatus, and S. multifasciata were collected. Sediment was collected using the method described above and stirred evenly, then 330-mL mud and feed samples were taken, dried at 60 C, measured for moisture content, and ground (Su et al, 2003). Water column samples were filtered through Whatman GF/C glass fiber filters.…”

Section: Measured Parameters and Methods Of Analysismentioning

confidence: 99%

Nitrogen and phosphorus budgets of a polyculture system containing Penaeus vannamei, Siganus guttatus, and Selenotoca multifasciata

Wang

Luo

Liu

2023

J World Aquaculture Soc

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The study was designed and conducted to optimize the structure of polyculture for Penaeus vannamei, Siganus guttatus (omnivorous fish), and Selenotoca multifasciata (carnivorous fish), and to compare the changes in yield, survival, and utilization rates of nitrogen (N) and phosphorus (P). Five treatments were performed as follows: Control (C) (0.0719 kg/m3, 0, 0), PSS1(0.0719 kg/m3, 0.0018 kg/m3, 0.0008 kg/m3), PSS2 (0.0719 kg/m3, 0.0033 kg/m3, 0.0016 kg/m3), PSS3 (0.0719 kg/m3, 0.0047 kg/m3, 0.0023 kg/m3), and PSS4 (0.0719 kg/m3, 0.0064 kg/m3, 0.0031 kg/m3) (with P:Penaeus vannamei, S:Siganus guttatus, and S: Selenotoca multifasciata). The yield and survival of P. vannamei in different treatments were significantly different (P<0.05), with the highest yields being P. vannamei (718.75 kg/hm3), S. guttatus (32.97 kg/hm3), and S. multifasciata (15.63 kg/hm3) for treatment PSS2. The highest survival of P. vannamei was 89.4 ± 1.6% for treatment PSS2, while the highest N and P utilization rates were 27.7% and 37.5% for treatment PSS3. The polyculture mode when using a suitable density can improve production and survival of P. vannamei, as well as the utilization rates of N and P.

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“…Thus, the role of nitrogen in sediments and its contributions to lake eutrophication must be evaluated based on different nitrogen fractions rather than total nitrogen (TN) only. The nitrogen forms in lake sediments have been extensively studied [2,[14][15][16][17]. These studies have provided valuable information on whether sediments act as an absorber or a source of nitrogen and have explored nitrogen cycling in lake ecosystems.…”

Section: Introductionmentioning

confidence: 99%

Composition, mineralization potential and release risk of nitrogen in the sediments of Keluke Lake, a Tibetan Plateau freshwater lake in China

et al. 2018

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The lakes distributed in the Tibetan Plateau constitute a lake group with the highest altitude, largest lakes and largest area in the world and are important in global climate and environmental effects. Freshwater lakes in the Tibetan Plateau possess high ecological values and high vulnerability. The migration and transformation of nitrogen in sediments are critical to lake ecosystems, but information on sedimentary nitrogen in the freshwater lakes in the Tibetan Plateau is limited. A case study was conducted in Keluke Lake, China, to reveal the effects of sedimentary nitrogen on water quality in plateau freshwater lakes. Nitrogen speciation, mineralization potential and release flux were analysed through a sequential extraction method, waterlogged incubation experiment and Fick's first diffusion law, respectively. The content of total nitrogen (TN) was 1295.75–6151.69 mg kg−1, and 94.2% of TN was organic nitrogen (ON). The contents of three nitrogen fractions were in the order of hydrolysable nitrogen > residual nitrogen > exchangeable nitrogen. Ammonia nitrogen false(NH4+−Nfalse) was the main mineralization product, and hydrolysable ON was the most significant contributor. The sediments showed a great mineralization potential, with a potentially mineralizable nitrogen value of 408.76 mg N kg−1 of sediment, that was mainly affected by hydrolysable ammonium nitrogen. The NH4+−N diffusion flux ranged from 24.14 to 148.75 mg m−2 d−1, and the sediments served as an internal nitrogen source. Nitrogen release from sediments was considerably influenced by exchangeable ammonia nitrogen. The sediments in Keluke Lake pose a potential nitrogen release risk and threaten the water quality of the lake. The total content, speciation, mineralization of ON and the release flux at sediment–water interface should be considered comprehensively to evaluate the effects of nitrogen in sediments to water quality.

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Microbial bioavailability of dissolved organic nitrogen (DON) in the sediments of Lake Shankou, Northeastern China

Cited by 13 publications

References 49 publications

Characteristics of Dissolved Organic Nitrogen in the Sediments of Six Water Sources in Taihu Lake, China

Characteristics of Dissolved Organic Nitrogen in the Sediments of Six Water Sources in Taihu Lake, China

Nitrogen and phosphorus budgets of a polyculture system containing Penaeus vannamei, Siganus guttatus, and Selenotoca multifasciata

Composition, mineralization potential and release risk of nitrogen in the sediments of Keluke Lake, a Tibetan Plateau freshwater lake in China

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