Effects of Typhoon Mujigae on the Biogeochemistry and Ecology of a Semi‐Enclosed Bay in the Northern South China Sea

Zhou, Xin; Jin, Guangzhe; Li, Jiacheng; Song, Zhiguang; Zhang, Shuwen; Chen, Chunqing; Huang, Chao; Chen, Fajin; Zhu, Qingmei; Yu, Mengxi

doi:10.1029/2020jg006031

Cited by 26 publications

(36 citation statements)

References 80 publications

(117 reference statements)

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“…The POM in marine environments can originate from allochthonous sources and the in situ biological processes (Ye et al, 2016). In our study, POC and PN are not correlated (p > 0.05), which differs from the linear relationships found in the marine POM dominated by phytoplankton (Zhou et al, 2021).…”

Section: Multiple Sources Of Poc and Pncontrasting

confidence: 92%

“…To obtain the concentration of TSM, the dry weight difference between the pre-weighed and re-weighed values was divided by the filtration volume (Zhou et al, 2021). The filters used for analysis of the concentrations of POC and PN and the values of d 13 C POC and d 15 N PN were tightly packed into a tin cup, and those response variables quantified with an element analyzer coupled to a stable isotope ratio mass spectrometer (EA Isolink-253 Plus, Thermo Fisher Scientific, Bremen, Germany).…”

Section: Measures Of Particulate Organic Matter Parametersmentioning

confidence: 99%

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Source, distribution, and transformation of dissolved and particulate organic matters in Qinzhou Bay, Northern Beibu Gulf

et al. 2023

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Both dissolved and particulate organic matters (DOM and POM) provide a reduced carbon pool of considerable size in coastal ecosystems, and the two are closely linked. Currently, however, the integrated study of DOM and POM remains limited, precluding a more in-depth understanding of their interaction in coastal regions. In April 2021, 13 surface water samples were collected from Qinzhou Bay, in the northern Beibu Gulf. The DOM samples were characterized using dissolved organic carbon (DOC) analysis and UV-visible and fluorescence spectroscopy techniques. We determined the POM for the particulate organic carbon and nitrogen (POC and PN) and also isotopic composition (δ13C and δ15N). The weak to negligible relationships found between the DOC, colored and fluorescent DOM, salinity, and chlorophyll a together suggested that DOM’s distribution in Qinzhou Bay is concurrently shaped by various processes, namely, hydrological and in situ biological processes. A high C/N ratio of ~17, high POC/chlorophyll a ratio (253 ± 112), and depleted δ13C (−25.7 ± 1.6‰) confirmed that POM is highly degraded and originates mainly from allochthonous input, to which the terrigenous organic matter and freshwater phytoplankton each contributes 35%. The total organic carbon (TOC = DOC + POC) was positively correlated with the humic-like peak M, revealing the transformation of labile DOM and POM into recalcitrant DOM components. The in situ production efficiency of peak M in surface waters of Qinzhou Bay is one order of magnitude greater than that in inland waters or open oceans, indicating that not only temperature but also the activity of substrate is a key factor controlling the in situ production of recalcitrant DOM in Qinzhou Bay. High levels of TOC and humic-like fluorescent DOM suggest the mass coexistence of organic matter differing in its reactivity, highlighting the large potential for photochemical as well as microbial degradation in the future.

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Section: Multiple Sources Of Poc and Pncontrasting

confidence: 92%

Section: Measures Of Particulate Organic Matter Parametersmentioning

confidence: 99%

Source, distribution, and transformation of dissolved and particulate organic matters in Qinzhou Bay, Northern Beibu Gulf

et al. 2023

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“…After 3 days of incubation at 37 °C, the microbial biomass was collected and lyophilized. The dried samples were manually pulverized and sent to Guangdong Ocean University for 15 N content analysis by an element analyzer coupled with a stable isotope ratio mass spectrometer (EA Isolink-253 Plus, Thermo Fisher Scientific, Waltham, MA, USA) [ 44 ]. All experiments were performed in triplicate.…”

Section: Methodsmentioning

confidence: 99%

Arsenic Mobilization and Transformation by Ammonium-Generating Bacteria Isolated from High Arsenic Groundwater in Hetao Plain, China

Jiang

Shen

Shi

et al. 2022

IJERPH

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Arsenic (As) mobilization in groundwater involves biogeochemical cycles of carbon, iron, and sulfur. However, few studies have focused on the role of nitrogen-metabolizing bacteria in As mobilization, as well as in the transformation between inorganic and organic As in groundwater. In this study, the nitrogen and As metabolisms of Citrobacter sp. G-C1 and Paraclostridium sp. G-11, isolated from high As groundwater in Hetao Plain, China, were characterized by culture experiments and genome sequencing. The results showed Citrobacter sp. G-C1 was a dissimilatory nitrate-reducing bacterium. The dissimilatory nitrate reduction to ammonia (DNRA) and As-detoxifying pathways identified in the genome enabled Citrobacter sp. G-C1 to simultaneously reduce As(V) during DNRA. Paraclostridium sp. G-11 was a nitrogen-fixing bacterium and its nitrogen-fixing activity was constrained by As. Nitrogen fixation and the As-detoxifying pathways identified in its genome conferred the capability of As(V) reduction during nitrogen fixation. Under anaerobic conditions, Citrobacter sp. G-C1 was able to demethylate organic As and Paraclostridium sp. G-11 performed As(III) methylation with the arsM gene. Collectively, these results not only evidenced that ammonium-generating bacteria with the ars operon were able to transform As(V) to more mobile As(III) during nitrogen-metabolizing processes, but also involved the transformation between inorganic and organic As in groundwater.

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“…Coastal bays are one of the most important zones of the land and ocean, which can receive a tremendous amount of terrestrial and marine organic matter (OM) (Lin et al, 2019;Gao et al, 2021;Zhou et al, 2021;Dan et al, 2022). The inventories of particulate and dissolved organic matter (POM and DOM) are the most important organic carbon pools in the ocean, which play a crucial role in the global carbon and nitrogen cycle, thereby affecting climate change (Ye et al, 2018;Yang et al, 2020;Qu et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Assessing the sources and dynamics of organic matter in a high human impact bay in the northern Beibu Gulf: Insights from stable isotopes and optical properties

et al. 2022

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Severe human activities in coastal areas have greatly impacted the sources and biogeochemical behaviors of organic matter (OM), including particulate OM (POM) and dissolved OM (DOM). However, few studies have incorporated the indices of POM and DOM to address this issue. Here, a dataset of the combination of stable isotopes of carbon and nitrogen in POM and the optical properties of DOM was presented in Xi Bay, a semi-enclosed bay with a highly developing industrial port in Beibu Gulf, South China, to reveal the origin, distribution, and fate of OM during the rainy season. In the upper bay, depleted δ13C suggested that particulate organic carbon (POC) mainly originated from terrestrial sources. However, the negative relationship between chromophoric DOM (CDOM) and particulate nitrogen (PN) suggested that bacterial-mediated decomposition of POM may be the primary source of CDOM. The negative correlation between humic-like fluorescent components (C1 and C2) and salinity suggested that those two components were mainly affected by terrestrial input. The significant correlation between the protein-like component (C3) and Chl a suggested that C3 was mainly derived from phytoplankton production in the upper bay. In the lower bay, the increase of δ13C values indicated an increased contribution of marine POC. The high levels of CDOM may be due to the decomposition of marine (fresh) POM. However, the low levels of C1 and C2 might be affected by dilution with seawater, and the increased levels of the protein-like C3 were due to enhanced primary production. In addition, the enhancement of δ15N values in both the upper and lower bays indicated serious nitrogen pollution in the bay. This study highlights that biological production fueled by excess nutrients is the dominant OM dynamic process in the bay with high human impact in Beibu Gulf.

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Effects of Typhoon Mujigae on the Biogeochemistry and Ecology of a Semi‐Enclosed Bay in the Northern South China Sea

Abstract: Typhoons are extreme events that frequently affect the open ocean and coastal areas in low latitudes (Herbeck et al., 2011). At present, the influence of typhoons on the ocean was studied almost by the satellite remote sensing data (

Cited by 26 publications

References 80 publications

Source, distribution, and transformation of dissolved and particulate organic matters in Qinzhou Bay, Northern Beibu Gulf

Source, distribution, and transformation of dissolved and particulate organic matters in Qinzhou Bay, Northern Beibu Gulf

Arsenic Mobilization and Transformation by Ammonium-Generating Bacteria Isolated from High Arsenic Groundwater in Hetao Plain, China

Assessing the sources and dynamics of organic matter in a high human impact bay in the northern Beibu Gulf: Insights from stable isotopes and optical properties

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