The flux of DOC from the UK – Predicting the role of soils, land use and net watershed losses

Worrall, Fred; Davies, Helen; Bhogal, A.; Lilly, Allan; Evans, Martin; Turner, Kate; Burt, Tim; Barraclough, D.; Smith, Pete; Merrington, Graham

doi:10.1016/j.jhydrol.2012.04.053

Cited by 66 publications

(54 citation statements)

References 50 publications

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“…Thus, monitoring headwater catchments was necessary to disentangle both types of processes, as observed downstream export regimes may not describe well the dynamics of landto-stream transfer (Worrall et al, 2012;Minaudo et al, 2015;Temnerud et al, 2016;Baronas et al, 2017). Furthermore, both upstream processes (e.g., summer SRP release) and downstream contributions (e.g., point-source SRP contribution during summer) may lead to the same export regime (e.g., high SRP during low flow); this phenomenon creates epistemic uncertainty, which may lead to equifinality problems when calibrating catchment models to the data (Beven, 2013).…”

Section: Implications For Monitoring and Managementmentioning

confidence: 99%

Carbon and nutrient export regimes from headwater catchments to downstream reaches

et al. 2017

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Abstract. Excessive amounts of nutrients and dissolved organic matter in freshwater bodies affect aquatic ecosystems. In this study, the spatial and temporal variability in nitrate (NO − 3 ), dissolved organic carbon (DOC) and soluble reactive phosphorus (SRP) was analyzed in the Selke (Germany) river continuum from three headwaters draining 1-3 km 2 catchments to two downstream reaches representing spatially integrated signals from 184-456 km 2 catchments. Three headwater catchments were selected as archetypes of the main landscape units (land use × lithology) present in the Selke catchment. Export regimes in headwater catchments were interpreted in terms of NO − 3 , DOC and SRP land-to-stream transfer processes. Headwater signals were subtracted from downstream signals, with the differences interpreted in terms of in-stream processes and contributions from point sources. The seasonal dynamics for NO − 3 were opposite those of DOC and SRP in all three headwater catchments, and spatial differences also showed NO − 3 contrasting with DOC and SRP. These dynamics were interpreted as the result of the interplay of hydrological and biogeochemical processes, for which riparian zones were hypothesized to play a determining role. In the two downstream reaches, NO − 3 was transported almost conservatively, whereas DOC was consumed and produced in the upper and lower river sections, respectively. The natural export regime of SRP in the three headwater catchments mimicked a point-source signal (high SRP during summer low flow), which may lead to overestimation of domestic contributions in the downstream reaches. Monitoring the river continuum from headwaters to downstream reaches proved effective to jointly investigate land-to-stream and instream transport, and transformation processes.

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Section: Implications For Monitoring and Managementmentioning

confidence: 99%

Carbon and nutrient export regimes from headwater catchments to downstream reaches

et al. 2017

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“…30 iii) An evaluation of the E2:E3, E2:E4, E4:E6 ratios, and SUVA (absorbance at 254 nm 31 normalised to DOC concentration) as indicators of DOC quality showed that the E4:E6 ratio 32 was subject to extensive variation over time, and was highly correlated between surface water 33 and pore water, suggesting that it is a useful metric to determine temporal changes in DOC 34 quality. 35 iv) A repeated weekly analysis over twelve weeks showed no consistent change in UV-Vis 36 absorbance, and therefore an inferred lack of degradation of total DOC in samples that were 37 filtered and stored in the dark at 4°C.…”

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confidence: 99%

“…Occasionally DOC is calculated for a specific site using a 88 calibration generated elsewhere 37 However, the study in question 33 investigated 400 nm as a proxy which is within the visible 92 spectrum. Absorbance in visible wavelengths is used in the water industry as it is important 93 to the aesthetic quality of treated waters, but as humic substances are coloured to varying 94 degrees 20 a wavelength in this region may not be the most appropriate proxy for total DOC.…”

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confidence: 99%

UV-visible absorbance spectroscopy as a proxy for peatland dissolved organic carbon (DOC) quantity and quality: considerations on wavelength and absorbance degradation

Peacock

Evans

Fenner

et al. 2014

Environ. Sci.: Processes Impacts

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“…TOC, DON and DOP exports are dependent on climatic and hydrologic factors (Sobek et al 2007;Sarkkola et al 2009), soil organic matter stocks (Sobek et al 2007), land use (Pellerin et al 2006;Mattsson et al 2009;Kindler et al 2011) and management such as forest cutting (Schelker et al 2012), ditching (Joensuu et al 2002), peat mining (Kløve 2001) and other agricultural practices (Worrall et al 2012). In the boreal region lake water, C is mainly of allochthonous origin, i.e.…”

Section: Introductionmentioning

confidence: 99%

Predicting the export and concentrations of organic carbon, nitrogen and phosphorus in boreal lakes by catchment characteristics and land use: A practical approach

Palviainen

Laurén

Launiainen

et al. 2016

Ambio

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The majority of C, N and P in boreal lakes are in organic form. Organically bound nutrients are released through biodegradation or photodegradation which affects the water quality, eutrophication and greenhouse gas emissions of lakes. We tested whether open land-use data combined with land-use-specific export coefficients can be used to predict total organic carbon (TOC), dissolved organic nitrogen (DON) and dissolved organic phosphorus (DOP) loading and lake water concentrations. Using data from 12 lake catchments in eastern Finland, we found that land use and management of the catchment explained a substantial proportion of the variations in TOC (r 2 = 0.78), DON (r 2 = 0.55) and DOP (r 2 = 0.80) concentrations between lakes. The computation does not account for in-lake processes, which are reflected as mismatch between the predicted and observed concentrations. However, this simple practical approach is useful in ranking lakes according to their water quality. The results indicated that natural sources dominate TOC, DON and DOP exports; the background leachings accounted for 57-99 %, 48-96 % and 55-99 % of TOC, DON and DOP export, respectively. The proposed method has promise as a practical decision support tool for assessing the impacts of land use on water quality. The results showed that possibilities to control TOC, DON and DOP loading to surface waters are limited to catchments where the peatland proportion is low and anthropogenic sources significant.

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The flux of DOC from the UK – Predicting the role of soils, land use and net watershed losses

Cited by 66 publications

References 50 publications

Carbon and nutrient export regimes from headwater catchments to downstream reaches

Carbon and nutrient export regimes from headwater catchments to downstream reaches

UV-visible absorbance spectroscopy as a proxy for peatland dissolved organic carbon (DOC) quantity and quality: considerations on wavelength and absorbance degradation

Predicting the export and concentrations of organic carbon, nitrogen and phosphorus in boreal lakes by catchment characteristics and land use: A practical approach

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