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Hydrological controls on DOC: nitrate resource stoichiometry in a lowland, agricultural catchment, southern UK

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Hydrological controls on DOC : nitrate resource stoichiometry in a lowland, agricultural catchment, southern UK. / Heppell, Catherine M.; Binley, Andrew; Trimmer, Mark; Darch, Tegan; Jones, Ashley; Malone, Edward; Collins, Adrian L.; Johnes, Penny J.; Freer, Jim E.; Lloyd, Charlotte E. M.

In: Hydrology and Earth System Sciences, Vol. 21, No. 9, 27.09.2017, p. 4785-4802.

Research output: Contribution to journalJournal articlepeer-review

Harvard

Heppell, CM, Binley, A, Trimmer, M, Darch, T, Jones, A, Malone, E, Collins, AL, Johnes, PJ, Freer, JE & Lloyd, CEM 2017, 'Hydrological controls on DOC: nitrate resource stoichiometry in a lowland, agricultural catchment, southern UK', Hydrology and Earth System Sciences, vol. 21, no. 9, pp. 4785-4802. https://doi.org/10.5194/hess-21-4785-2017

APA

Heppell, C. M., Binley, A., Trimmer, M., Darch, T., Jones, A., Malone, E., Collins, A. L., Johnes, P. J., Freer, J. E., & Lloyd, C. E. M. (2017). Hydrological controls on DOC: nitrate resource stoichiometry in a lowland, agricultural catchment, southern UK. Hydrology and Earth System Sciences, 21(9), 4785-4802. https://doi.org/10.5194/hess-21-4785-2017

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Author

Heppell, Catherine M. ; Binley, Andrew ; Trimmer, Mark ; Darch, Tegan ; Jones, Ashley ; Malone, Edward ; Collins, Adrian L. ; Johnes, Penny J. ; Freer, Jim E. ; Lloyd, Charlotte E. M. / Hydrological controls on DOC : nitrate resource stoichiometry in a lowland, agricultural catchment, southern UK. In: Hydrology and Earth System Sciences. 2017 ; Vol. 21, No. 9. pp. 4785-4802.

Bibtex

@article{dad5ecf9d39544abb0f8f03be0a14755,
title = "Hydrological controls on DOC: nitrate resource stoichiometry in a lowland, agricultural catchment, southern UK",
abstract = "The role that hydrology plays in governing the interactions between dissolved organic carbon (DOC) and nitrogen in rivers draining lowland, agricultural landscapes is currently poorly understood. In light of the potential changes to the production and delivery of DOC and nitrate to rivers arising from climate change and land use management, there is a pressing need to improve our understanding of hydrological controls on DOC and nitrate dynamics in such catchments. We measured DOC and nitrate concentrations in river water of six reaches of the lowland river Hampshire Avon (Wiltshire, southern UK) in order to quantify the relationship between BFI (BFI) and DOC: nitrate molar ratios across contrasting geologies (Chalk, Greensand, and clay). We found a significant positive relationship between nitrate and BFI (p <0.0001), and a significant negative relationship between DOC and BFI (p <0.0001), resulting in a non-linear negative correlation between DOC: nitrate molar ratio and BFI. In the Hampshire Avon, headwater reaches which are underlain by clay and characterized by a more flashy hydrological regime are associated with DOC: nitrate ratios > 5 throughout the year, whilst groundwater-dominated reaches underlain by Chalk, with a high BFI have DOC: nitrate ratios in surface waters that are an order of magnitude lower (<0.5). Our analysis also reveals significant seasonal variations in DOC: nitrate transport and highlights critical periods of nitrate export (e.g. winter in sub-catchments underlain by Chalk and Greensand, and autumn in drained, clay sub-catchments) when DOC: nitrate molar ratios are low, suggesting low potential for in-stream uptake of inorganic forms of nitrogen. Consequently, our study emphasizes the tight relationship between DOC and nitrate availability in agricultural catchments, and further reveals that this relationship is controlled to a great extent by the hydrological setting.",
keywords = "DISSOLVED ORGANIC-CARBON, SURFACE-WATER QUALITY, CLIMATE-CHANGE, NITROGEN DYNAMICS, CHALK CATCHMENT, HIGH-FREQUENCY, LONG-TERM, STREAM, NUTRIENT, SOIL",
author = "Heppell, {Catherine M.} and Andrew Binley and Mark Trimmer and Tegan Darch and Ashley Jones and Edward Malone and Collins, {Adrian L.} and Johnes, {Penny J.} and Freer, {Jim E.} and Lloyd, {Charlotte E. M.}",
year = "2017",
month = sep,
day = "27",
doi = "10.5194/hess-21-4785-2017",
language = "English",
volume = "21",
pages = "4785--4802",
journal = "Hydrology and Earth System Sciences",
issn = "1027-5606",
publisher = "Copernicus Gesellschaft mbH",
number = "9",

}

RIS

TY - JOUR

T1 - Hydrological controls on DOC

T2 - nitrate resource stoichiometry in a lowland, agricultural catchment, southern UK

AU - Heppell, Catherine M.

AU - Binley, Andrew

AU - Trimmer, Mark

AU - Darch, Tegan

AU - Jones, Ashley

AU - Malone, Edward

AU - Collins, Adrian L.

AU - Johnes, Penny J.

AU - Freer, Jim E.

AU - Lloyd, Charlotte E. M.

PY - 2017/9/27

Y1 - 2017/9/27

N2 - The role that hydrology plays in governing the interactions between dissolved organic carbon (DOC) and nitrogen in rivers draining lowland, agricultural landscapes is currently poorly understood. In light of the potential changes to the production and delivery of DOC and nitrate to rivers arising from climate change and land use management, there is a pressing need to improve our understanding of hydrological controls on DOC and nitrate dynamics in such catchments. We measured DOC and nitrate concentrations in river water of six reaches of the lowland river Hampshire Avon (Wiltshire, southern UK) in order to quantify the relationship between BFI (BFI) and DOC: nitrate molar ratios across contrasting geologies (Chalk, Greensand, and clay). We found a significant positive relationship between nitrate and BFI (p <0.0001), and a significant negative relationship between DOC and BFI (p <0.0001), resulting in a non-linear negative correlation between DOC: nitrate molar ratio and BFI. In the Hampshire Avon, headwater reaches which are underlain by clay and characterized by a more flashy hydrological regime are associated with DOC: nitrate ratios > 5 throughout the year, whilst groundwater-dominated reaches underlain by Chalk, with a high BFI have DOC: nitrate ratios in surface waters that are an order of magnitude lower (<0.5). Our analysis also reveals significant seasonal variations in DOC: nitrate transport and highlights critical periods of nitrate export (e.g. winter in sub-catchments underlain by Chalk and Greensand, and autumn in drained, clay sub-catchments) when DOC: nitrate molar ratios are low, suggesting low potential for in-stream uptake of inorganic forms of nitrogen. Consequently, our study emphasizes the tight relationship between DOC and nitrate availability in agricultural catchments, and further reveals that this relationship is controlled to a great extent by the hydrological setting.

AB - The role that hydrology plays in governing the interactions between dissolved organic carbon (DOC) and nitrogen in rivers draining lowland, agricultural landscapes is currently poorly understood. In light of the potential changes to the production and delivery of DOC and nitrate to rivers arising from climate change and land use management, there is a pressing need to improve our understanding of hydrological controls on DOC and nitrate dynamics in such catchments. We measured DOC and nitrate concentrations in river water of six reaches of the lowland river Hampshire Avon (Wiltshire, southern UK) in order to quantify the relationship between BFI (BFI) and DOC: nitrate molar ratios across contrasting geologies (Chalk, Greensand, and clay). We found a significant positive relationship between nitrate and BFI (p <0.0001), and a significant negative relationship between DOC and BFI (p <0.0001), resulting in a non-linear negative correlation between DOC: nitrate molar ratio and BFI. In the Hampshire Avon, headwater reaches which are underlain by clay and characterized by a more flashy hydrological regime are associated with DOC: nitrate ratios > 5 throughout the year, whilst groundwater-dominated reaches underlain by Chalk, with a high BFI have DOC: nitrate ratios in surface waters that are an order of magnitude lower (<0.5). Our analysis also reveals significant seasonal variations in DOC: nitrate transport and highlights critical periods of nitrate export (e.g. winter in sub-catchments underlain by Chalk and Greensand, and autumn in drained, clay sub-catchments) when DOC: nitrate molar ratios are low, suggesting low potential for in-stream uptake of inorganic forms of nitrogen. Consequently, our study emphasizes the tight relationship between DOC and nitrate availability in agricultural catchments, and further reveals that this relationship is controlled to a great extent by the hydrological setting.

KW - DISSOLVED ORGANIC-CARBON

KW - SURFACE-WATER QUALITY

KW - CLIMATE-CHANGE

KW - NITROGEN DYNAMICS

KW - CHALK CATCHMENT

KW - HIGH-FREQUENCY

KW - LONG-TERM

KW - STREAM

KW - NUTRIENT

KW - SOIL

U2 - 10.5194/hess-21-4785-2017

DO - 10.5194/hess-21-4785-2017

M3 - Journal article

VL - 21

SP - 4785

EP - 4802

JO - Hydrology and Earth System Sciences

JF - Hydrology and Earth System Sciences

SN - 1027-5606

IS - 9

ER -