Assessing changes in nutrient status in the Richmond River estuary, Australia, using paleolimnological methods

Logan, Brendan; Taffs, Kathryn H; Eyre, Bradley D.; Zawadski, Atun

doi:10.1007/s10933-010-9457-x

Cited by 25 publications

(5 citation statements)

References 55 publications

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“…The old age of DOC resulting from the breakdown of sediment OM at the study site suggests that the material forming the sediment was composed of older scour material deposited on the mudflat. Flooding within the Richmond River occurs at regular intervals 40,41 and dating of basal core organic matter just upstream from our study site showed an age of 5312−5583 years BP, 42 which is similar to the age of the effluxed DOC. Given the tendency for material composed of older Δ 14 C to be less photoreactive and bioavailable, and the refractory nature of the characterized compounds, the exported material is likely directly transported to the coastal shelf with minimal reworking after hydrolysis by heterotrophic bacteria in the sediment.…”

Section: ■ Results and Discussionsupporting

confidence: 71%

Shining Light on Priming in Euphotic Sediments: Nutrient Enrichment Stimulates Export of Stored Organic Matter

Riekenberg

Oakes

Eyre

2020

Environ. Sci. Technol.

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Estuarine sediments are important sites for the interception, processing, and retention of organic matter, prior to its export to the coastal oceans. Stimulated microbial cometabolism (priming) potentially increases export of refractory organic matter through increased production of hydrolytic enzymes. Using the microphytobenthos community to directly introduce a pulse of labile carbon into sediment, we traced a priming effect and assessed the decomposition and export of preexisting organic matter. We show enhanced efflux of preexisting carbon from intertidal sediments enriched with water column nutrients. Nutrient enrichment increased production of labile microphytobenthos carbon, which stimulated degradation of previously unavailable organic matter and led to increased liberation of "old" (6855 ± 120 years BP) refractory carbon as dissolved organic carbon (DOC). These enhanced DOC effluxes occurred at a scale that decreases estimates for global organic carbon burial in coastal systems and should be considered as an impact of eutrophication on estuarine carbon budgets.

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Section: ■ Results and Discussionsupporting

confidence: 71%

Shining Light on Priming in Euphotic Sediments: Nutrient Enrichment Stimulates Export of Stored Organic Matter

Riekenberg

Oakes

Eyre

2020

Environ. Sci. Technol.

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“…Flooding within the Richmond River occurs at regular intervals 27,28 and dating of basal core organic matter just upstream from our study site showed an age of 5,312 -5,583 y BP 29 , which is similar to the age of the effluxed DOC. Given the tendency for material composed of older Δ 14 C to be less photo-reactive and bioavailable, and the refractory nature of the characterized This is a non-peer reviewed EarthArXiv preprint of a manuscript submitted to Environmental Science and Technology compounds, the exported material is likely directly transported to the coastal shelf with minimal reworking after hydrolysis by heterotrophic bacteria in the sediment.…”

Section: Characterization Of Exported Docsupporting

confidence: 71%

Shining light on priming in euphotic sediments: Nutrient enrichment stimulates export of stored organic matter

Riekenberg¹,

Oakes²,

Eyre³

2020

Preprint

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Estuarine sediments are important sites for the interception, processing and retention of organic matter, prior to its export to the coastal oceans. Stimulated microbial co-metabolism (priming) potentially increases export of refractory organic matter through increased production of hydrolytic enzymes. By using the microphytobenthos community to directly introduce a pulse of labile carbon into sediment, we traced a priming effect and assessed the decomposition and export of pre-existing organic matter. We show enhanced efflux of pre-existing carbon from intertidal sediments enriched with water column nutrients. Nutrient enrichment increased production of labile microphytobenthos-carbon which stimulated degradation of previously unavailable organic matter and led to increased liberation of “old” (6855 ± 120 years BP) refractory carbon as dissolved organic carbon. These enhanced DOC effluxes occurred at a scale that decreases estimates for global organic carbon burial in coastal systems and should be considered as an impact of eutrophication on estuarine carbon budgets.

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“…A large number of studies have shown that the enormous accumulation of DIN in most estuaries is related to human activities [ 7 , 8 , 9 ]. Despite government measures for controlling point and nonpoint source pollution, the damage to estuaries and coastal water bodies is worsening at an accelerated rate [ 10 , 11 ]. According to the Bulletin of China Marine Ecological Environment Status [ 12 ], sea pollution in the past five years has extended mainly to coastal water bodies such as estuaries and bays, which have accumulated alarming amounts of DIN and labile phosphate.…”

Section: Introductionmentioning

confidence: 99%

Traceability and Emission Reduction of Dissolved Inorganic Nitrogen in Minjiang Estuary, China

Fan

Zhang

Song

et al. 2021

IJERPH

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The accumulation of dissolved inorganic nitrogen (DIN) in estuaries has become a global environmental problem. A two-dimensional, hydrodynamic water quality model was constructed in this study to investigate the sources of DIN pollution in the Minjiang Estuary. The concentration response field between the stream input and DIN in the estuary was established by using the surveyed source data of the study area. A sharing coefficient method was used to calculate the contribution percentage of each outfall to derive and propose a reasonable nitrogen reduction plan. The results showed that the input of land-based nitrogen into the Minjiang River contributed more than half of the DIN in the near-shore sea; the middle and upper reaches of the Minjiang River largely influenced the estuary area (38.57%). Conversely, the estuary and the coastline accounted for a smaller proportion of only 5.24%, indicating that an integrated DIN reduction should be implemented in the estuary area of the whole river basin. The model calculations showed that the reduction results, after remediation according to the current national standards for wastewater discharge in rivers, were not satisfactory. Thus, a new scheme is proposed in this paper—the total nitrogen (TN) input from land-based sources into the Minjiang Estuary and from the Shuikou Dam to the Min’an section should be reduced to below 31.64%; simultaneously, the DIN concentration discharged from the Shuikou Dam should be controlled and maintained below 0.5 mg·L−1 (TN = 0.8 mg·L−1). These results will provide guidelines for developing strategies for the improvement of DIN and water quality in similar estuaries.

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Assessing changes in nutrient status in the Richmond River estuary, Australia, using paleolimnological methods

Cited by 25 publications

References 55 publications

Shining Light on Priming in Euphotic Sediments: Nutrient Enrichment Stimulates Export of Stored Organic Matter

Shining Light on Priming in Euphotic Sediments: Nutrient Enrichment Stimulates Export of Stored Organic Matter

Shining light on priming in euphotic sediments: Nutrient enrichment stimulates export of stored organic matter

Traceability and Emission Reduction of Dissolved Inorganic Nitrogen in Minjiang Estuary, China

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