Role of organic components in regulating denitrification in the coastal water of Daya Bay, southern China

Zeng, Jiye; Chen, Min; Guo, Laodong; Lin, Hui; Mu, Xinyue; Fan, Linfang; Zheng, Minghui; Qiu, Yusheng

doi:10.1039/c8em00558c

Cited by 6 publications

(2 citation statements)

References 60 publications

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“…Interestingly, the input flux of CSP-N (6 × 10 6 mol N d −1 ) from the PRE in our study is approximately equivalent to the sediment nitrogen loss observed by Tan et al (2019). It is presumably assumed that denitrifying and anammox bacteria may preferentially utilize CSP over DOM and non-CSP PN sources in the PRE (Zeng et al, 2019).…”

Section: Implying For Nitrogen Cycling In the Pearl River Estuarysupporting

confidence: 55%

Distribution of Coomassie Blue Stainable Particles in the Pearl River Estuary, China, Insight Into the Nitrogen Cycling in Estuarine System

et al. 2022

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Distributions of Coomassie Blue stainable particles (CSP), the sources and transports, as well as their implications for nitrogen biogeochemical cycles in the Pearl River estuary (PRE) were investigated during two cruises in August 2016 and January 2017. CSPcolor concentrations (CSP concentration determined spectrophotometrically) were 73.7–685.3 μg BSA eq L–1 [μg Bovine serum albumin (BSA) equivalent liter–1] in August 2016 and 100.6–396.4 μg BSA eq L–1 in January 2017, respectively. CSP concentrations were high in low-salinity waters (<5), and declined from the river to the middle estuary by 80% in the wet season and 55.6% in the dry season, respectively, then increased again in the lower estuary due to high primary production. CSP concentrations were mainly associated with chlorophyll a (Chl a) concentration except for the turbid mixing zone, suggesting that autochthonous phytoplankton production served as the primary source of CSP in the PRE. The concentrations of nitrogen (N) as CSP in the PRE were comparable to the nitrogen content of particulate hydrolysable amino acids (PHAA). Pictures of CSP taken by microscopy and the correlation between composition of PHAA and the ratio of Chl a/CSPcolor showed that CSP were relatively degraded due to delivery of old terrestrial protein to river section and extensive microbial degradation during mixing at the upper and middle parts of the estuary, whereas CSP in lower estuary appeared to be more labile due to higher fresh algal production. The contribution of CSP nitrogen (CSP-N) to the particulate nitrogen (PN) pool was 34.98% in summer and 30.8% in winter. The conservative estimate of CSP-N input flux in the Pearl River Delta was about 6 × 106 mol N d–1. These results suggested that CSP was a significant pool of organic nitrogen in the PRE. The study of CSP composition in terms of nitrogen provides new insight into the roles of CSP on nitrogen biogeochemical processes in the turbid and productive estuarine system.

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Section: Implying For Nitrogen Cycling In the Pearl River Estuarysupporting

confidence: 55%

Distribution of Coomassie Blue Stainable Particles in the Pearl River Estuary, China, Insight Into the Nitrogen Cycling in Estuarine System

et al. 2022

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“…Eutrophication may provide water column lowoxygen (micro)environments favoring the occurrence of denitrification, anammox and DNRA in surface waters (Broman et al, 2021). As an heterotrophic process, denitrification decreases the organic carbon pool while denitrifiers in anoxic water may preferentially utilize fresher and labile autochthonous POC instead of DOC (Zeng et al, 2019). DNRA in hypoxic waters also prefers autochthonous carbon (Broman et al, 2021), while the preference between POC and DOC is still undocumented.…”

Section: Biogeochemical Feedbacks Of Nitrogen To Carbon Cyclingmentioning

confidence: 99%

Exploring feedback mechanisms for nitrogen and organic carbon cycling in tropical coastal zones

Jiang

Jin

et al. 2022

Front. Mar. Sci.

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The anthropogenic introduction of significant amounts of reactive nitrogen in the coastal zone particularly since the discovery and application of the Haber-Bosch process has profound consequences over organic carbon storage and transformations at both regional and global scales. Here, we review our current knowledge on cause-effect chains for nitrogen, especially dissolved inorganic nitrogen, on organic carbon cycling in coastal tropical systems. We focus on the feedback mechanisms for turnover of different organic carbon species to nitrogen excess and links to current environmental and climate changes. We pay special attention to organic carbon dynamics in tropical coasts due to their high primary productivity, rapid sedimentation, and significant needs of nitrogen for agriculture and industry usages. Together with land-use changes and economy development, we highlight the vulnerability of carbon storage in tropical coasts triggered by nitrogen overloading and outline possible industrial strategies with low carbon cycling disturbance to benefit the development of tropical countries.

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The optical and molecular signatures of DOM under the eutrophication status in a shallow, semi-enclosed coastal bay in southeast China

Zhao

Zhou

Pang

et al. 2021

Sci. China Earth Sci.

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Role of organic components in regulating denitrification in the coastal water of Daya Bay, southern China

Abstract: The impact of dissolved and particulate organic mater on coastal water denitrification is evaluated. Particulate organic matter and its composition play a dominant role in regulating denitrifying activity.

Cited by 6 publications

References 60 publications

Distribution of Coomassie Blue Stainable Particles in the Pearl River Estuary, China, Insight Into the Nitrogen Cycling in Estuarine System

Distribution of Coomassie Blue Stainable Particles in the Pearl River Estuary, China, Insight Into the Nitrogen Cycling in Estuarine System

Exploring feedback mechanisms for nitrogen and organic carbon cycling in tropical coastal zones

The optical and molecular signatures of DOM under the eutrophication status in a shallow, semi-enclosed coastal bay in southeast China

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