Size fractionation of dissolved organic nitrogen in peatland fluvial systemsCitation formats

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Size fractionation of dissolved organic nitrogen in peatland fluvial systems. / Edokpa, Donald; Evans, Martin G; Boult, Stephen; Rothwell, James J.

In: Environmental Science and Technology, 2018.

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@article{e512ad14303b439e87fa0627fd32358f,
title = "Size fractionation of dissolved organic nitrogen in peatland fluvial systems",
abstract = "Understanding the nature and fate of nitrogen (N) in freshwater systems is crucial for assessing the risk of eutrophication. However, there is a paucity of information on the characterisation of fluvial N in upland peat-dominated environments. Here, we employ a combination of field sampling and tangential flow ultrafiltration (TFU) to investigate the concentrations and fluxes of low molecular weight (LMW) and high molecular weight (HMW) dissolved organic N (DON) in a peatland stream-reservoir system in the south Pennines (UK). Our TFU results show that ~ 26% of DON concentration is LMW DON and represents an estimated fluvial flux of 3.07±22 kg N ha-1 during the study period. Our mass balance results reveal that the reservoir retains 71% of LMW DON input, which accounts for ~ 25% retention of bioavailable (Dissolved inorganic N + LMW DON) N. Our study suggests that current understanding of inorganic N as the sole source of bioavailable N with eutrophic significance in upland freshwaters requires a reappraisal. Evaluation of ecosystem response to increased loading of N needs to include a consideration of LMW DON. ",
author = "Donald Edokpa and Evans, {Martin G} and Stephen Boult and Rothwell, {James J}",
year = "2018",
doi = "10.1021/acs.est.8b01417",
language = "English",
journal = "Environmental Science & Technology",
issn = "0013-936X",
publisher = "American Chemical Society",

}

RIS

TY - JOUR

T1 - Size fractionation of dissolved organic nitrogen in peatland fluvial systems

AU - Edokpa, Donald

AU - Evans, Martin G

AU - Boult, Stephen

AU - Rothwell, James J

PY - 2018

Y1 - 2018

N2 - Understanding the nature and fate of nitrogen (N) in freshwater systems is crucial for assessing the risk of eutrophication. However, there is a paucity of information on the characterisation of fluvial N in upland peat-dominated environments. Here, we employ a combination of field sampling and tangential flow ultrafiltration (TFU) to investigate the concentrations and fluxes of low molecular weight (LMW) and high molecular weight (HMW) dissolved organic N (DON) in a peatland stream-reservoir system in the south Pennines (UK). Our TFU results show that ~ 26% of DON concentration is LMW DON and represents an estimated fluvial flux of 3.07±22 kg N ha-1 during the study period. Our mass balance results reveal that the reservoir retains 71% of LMW DON input, which accounts for ~ 25% retention of bioavailable (Dissolved inorganic N + LMW DON) N. Our study suggests that current understanding of inorganic N as the sole source of bioavailable N with eutrophic significance in upland freshwaters requires a reappraisal. Evaluation of ecosystem response to increased loading of N needs to include a consideration of LMW DON.

AB - Understanding the nature and fate of nitrogen (N) in freshwater systems is crucial for assessing the risk of eutrophication. However, there is a paucity of information on the characterisation of fluvial N in upland peat-dominated environments. Here, we employ a combination of field sampling and tangential flow ultrafiltration (TFU) to investigate the concentrations and fluxes of low molecular weight (LMW) and high molecular weight (HMW) dissolved organic N (DON) in a peatland stream-reservoir system in the south Pennines (UK). Our TFU results show that ~ 26% of DON concentration is LMW DON and represents an estimated fluvial flux of 3.07±22 kg N ha-1 during the study period. Our mass balance results reveal that the reservoir retains 71% of LMW DON input, which accounts for ~ 25% retention of bioavailable (Dissolved inorganic N + LMW DON) N. Our study suggests that current understanding of inorganic N as the sole source of bioavailable N with eutrophic significance in upland freshwaters requires a reappraisal. Evaluation of ecosystem response to increased loading of N needs to include a consideration of LMW DON.

U2 - 10.1021/acs.est.8b01417

DO - 10.1021/acs.est.8b01417

M3 - Article

JO - Environmental Science & Technology

JF - Environmental Science & Technology

SN - 0013-936X

ER -