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Fine-scale in situ measurement of riverbed nitrate production and consumption in an armored permeable riverbed

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Fine-scale in situ measurement of riverbed nitrate production and consumption in an armored permeable riverbed. / Lansdown, Katrina; Heppell, Catherine M.; Dossena, Matteo et al.

In: Environmental Science and Technology, Vol. 48, No. 8, 15.04.2014, p. 4425-4434.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Lansdown, K, Heppell, CM, Dossena, M, Ullah, S, Heathwaite, AL, Binley, A, Zhang, H & Trimmer, M 2014, 'Fine-scale in situ measurement of riverbed nitrate production and consumption in an armored permeable riverbed', Environmental Science and Technology, vol. 48, no. 8, pp. 4425-4434. https://doi.org/10.1021/es4056005

APA

Vancouver

Lansdown K, Heppell CM, Dossena M, Ullah S, Heathwaite AL, Binley A et al. Fine-scale in situ measurement of riverbed nitrate production and consumption in an armored permeable riverbed. Environmental Science and Technology. 2014 Apr 15;48(8):4425-4434. Epub 2014 Mar 16. doi: 10.1021/es4056005

Author

Lansdown, Katrina ; Heppell, Catherine M. ; Dossena, Matteo et al. / Fine-scale in situ measurement of riverbed nitrate production and consumption in an armored permeable riverbed. In: Environmental Science and Technology. 2014 ; Vol. 48, No. 8. pp. 4425-4434.

Bibtex

@article{c635e02b81b146b394eedff242293f33,
title = "Fine-scale in situ measurement of riverbed nitrate production and consumption in an armored permeable riverbed",
abstract = "Alteration of the global nitrogen cycle by man has increased nitrogen loading in waterways considerably, often with harmful consequences for aquatic ecosystems. Dynamic redox conditions within riverbeds support a variety of nitrogen transformations, some of which can attenuate this burden. In reality, however, assessing the importance of processes besides perhaps denitrification is difficult, due to a sparseness of data, especially in situ, where sediment structure and hydrologic pathways are intact. Here we show in situ within a permeable riverbed, through injections of 15N-labeled substrates, that nitrate can be either consumed through denitrification or produced through nitrification, at a previously unresolved fine (centimeter) scale. Nitrification and denitrification occupy different niches in the riverbed, with denitrification occurring across a broad chemical gradient while nitrification is restricted to more oxic sediments. The narrow niche width for nitrification is in effect a break point, with the switch from activity “on” to activity “off” regulated by interactions between subsurface chemistry and hydrology. Although maxima for denitrification and nitrification occur at opposing ends of a chemical gradient, high potentials for both nitrate production and consumption can overlap when groundwater upwelling is strong.",
author = "Katrina Lansdown and Heppell, {Catherine M.} and Matteo Dossena and Sami Ullah and Heathwaite, {A. Louise} and Andrew Binley and Hao Zhang and Mark Trimmer",
year = "2014",
month = apr,
day = "15",
doi = "10.1021/es4056005",
language = "English",
volume = "48",
pages = "4425--4434",
journal = "Environmental Science and Technology",
issn = "0013-936X",
publisher = "American Chemical Society",
number = "8",

}

RIS

TY - JOUR

T1 - Fine-scale in situ measurement of riverbed nitrate production and consumption in an armored permeable riverbed

AU - Lansdown, Katrina

AU - Heppell, Catherine M.

AU - Dossena, Matteo

AU - Ullah, Sami

AU - Heathwaite, A. Louise

AU - Binley, Andrew

AU - Zhang, Hao

AU - Trimmer, Mark

PY - 2014/4/15

Y1 - 2014/4/15

N2 - Alteration of the global nitrogen cycle by man has increased nitrogen loading in waterways considerably, often with harmful consequences for aquatic ecosystems. Dynamic redox conditions within riverbeds support a variety of nitrogen transformations, some of which can attenuate this burden. In reality, however, assessing the importance of processes besides perhaps denitrification is difficult, due to a sparseness of data, especially in situ, where sediment structure and hydrologic pathways are intact. Here we show in situ within a permeable riverbed, through injections of 15N-labeled substrates, that nitrate can be either consumed through denitrification or produced through nitrification, at a previously unresolved fine (centimeter) scale. Nitrification and denitrification occupy different niches in the riverbed, with denitrification occurring across a broad chemical gradient while nitrification is restricted to more oxic sediments. The narrow niche width for nitrification is in effect a break point, with the switch from activity “on” to activity “off” regulated by interactions between subsurface chemistry and hydrology. Although maxima for denitrification and nitrification occur at opposing ends of a chemical gradient, high potentials for both nitrate production and consumption can overlap when groundwater upwelling is strong.

AB - Alteration of the global nitrogen cycle by man has increased nitrogen loading in waterways considerably, often with harmful consequences for aquatic ecosystems. Dynamic redox conditions within riverbeds support a variety of nitrogen transformations, some of which can attenuate this burden. In reality, however, assessing the importance of processes besides perhaps denitrification is difficult, due to a sparseness of data, especially in situ, where sediment structure and hydrologic pathways are intact. Here we show in situ within a permeable riverbed, through injections of 15N-labeled substrates, that nitrate can be either consumed through denitrification or produced through nitrification, at a previously unresolved fine (centimeter) scale. Nitrification and denitrification occupy different niches in the riverbed, with denitrification occurring across a broad chemical gradient while nitrification is restricted to more oxic sediments. The narrow niche width for nitrification is in effect a break point, with the switch from activity “on” to activity “off” regulated by interactions between subsurface chemistry and hydrology. Although maxima for denitrification and nitrification occur at opposing ends of a chemical gradient, high potentials for both nitrate production and consumption can overlap when groundwater upwelling is strong.

U2 - 10.1021/es4056005

DO - 10.1021/es4056005

M3 - Journal article

VL - 48

SP - 4425

EP - 4434

JO - Environmental Science and Technology

JF - Environmental Science and Technology

SN - 0013-936X

IS - 8

ER -