Trends in Dissolved Organic Carbon in UK Rivers and Lakes

Worrall, Fred; Harriman, R.; Evans, Chris; Watts, Carol D.; Adamson, J.; Neal, Colin; Tipping, E.; Burt, Tim; Grieve, Ian C.; Monteith, Don; Naden, Pamela S.; Nisbet, Tom; Reynolds, B.; Stevens, P.A.

doi:10.1007/s10533-004-8131-7

Cited by 239 publications

(196 citation statements)

References 52 publications

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“…It has been suggested that recent increases in this diatom, reaching major nuisance proportions in some countries, such as south-east Poland (Kawecka and Sanecki, 2003) and South Island of New Zealand (Kilroy, 2004) may have been influenced by increases in the concentration of organic phosphate draining peat and other organic-rich soils . Dissolved organic carbon (DOC) is also known to be increasing in upland areas of the UK (Worrall et al, 2004), but the present study showed no increase in FHP at R. Swale sites when DOC increased (Fig. 2).…”

Section: Discussioncontrasting

confidence: 69%

Organic phosphate in UK rivers and its relevance to algal and bryophyte surveys

Whitton

Neal

2011

Ann. Limnol. - Int. J. Lim.

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-Although the data on phosphate obtained in surveys are used to assess the distribution of river biota, the approach is flawed when the organisms use P fractions not included in routine analysis. This is especially important where aquatic phototrophs are partially or largely dependent on aqueous organic phosphate. This paper reports a study where the data are sufficient to assess the quantitative importance of organic phosphate in rivers in eastern UK. Filterable hydrolyzable phosphate-P (FHP) is used as a surrogate for organic phosphate, although FHP sometimes includes other P forms. Eighteen sites were sampled weekly for at least one, but mostly three years (2033 samples). The data are compared for mid-and lower-reach sites. FHP formed at least 20% TFP (total filterable phosphate-P) at 14 sites, with the percentage values higher at the more upstream and more northern sites. FHP exceeded 1000 mg.L x1 P in 32 mid-and 53 lower-reach records. The lower the TFP concentration, the higher the % FHP at both types of site. Five sites had over 25% of their records where FHP is likely to be especially important for growth of algae and bryophytes, based on FHP being > 50 mg.L x1 P when TFP j 200 mg.L x1 P. These include the upper site on River Swale, and other literature for this river indicates that FHP becomes increasingly important further upstream and even more so in tributary streams. FHP should be included in monitoring programmes for upland rivers, especially where the catchment includes peat-rich soils.

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Section: Discussioncontrasting

confidence: 69%

Organic phosphate in UK rivers and its relevance to algal and bryophyte surveys

Whitton

Neal

2011

Ann. Limnol. - Int. J. Lim.

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“…This is at least an order of magnitude higher than typical river DOC concentrations (4,42), but is much more typical of DOC concentrations occurring in soil porewater in peaty soils (7,33). This in turn suggests that the rising DOC concentrations in river water may per se not be sufficient to impart large-scale colloidal stability to the clay particles and iron oxhydroxides.…”

Section: What Happens To the Native Nom During The Structural Transfomentioning

confidence: 84%

“…factors related to climate change (such as increased organic matter decomposition rates as a result of warming and the drying and aeration of peaty soils; 4,6,7) and changes in atmospheric deposition chemistry (particularly the effects of declining sulphur and marine-derived sea-salt deposition on increased soil DOC solubility ; 8, 9). However, a recent study (10) has now linked trends in increasing concentrations of 'dissolved iron' (defined as <0.45 μm fraction) in UK upland rivers and lakes with the rising DOC concentrations.…”

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confidence: 99%

Exploring How Organic Matter Controls Structural Transformations in Natural Aquatic Nanocolloidal Dispersions

King

Jarvie

2012

Environ. Sci. Technol.

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“…These studies reported increasing concentrations in Scottish landscapes from June to November and from May to June, respectively. The early autumn is considered to be the time of maximum DOC export (Cooper et al, 2007;Grieve, 1984;Worrall et al, 2004). The rising trend can result from increasing soil temperature and moisture which are driving factors for decomposition.…”

Section: Dissolved Organic Carbon (Doc)mentioning

confidence: 99%

Spatial distribution of soils determines export of nitrogen and dissolved organic carbon from an intensively managed agricultural landscape

Wohlfart¹,

Exbrayat

Schelde

et al. 2012

Biogeosciences

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Abstract. The surrounding landscape of a stream has crucial impacts on the aquatic environment. This study pictures the hydro-biogeochemical situation of the Tyrebaekken creek catchment in central Jutland, Denmark. The intensively managed agricultural landscape is dominated by rotational croplands. The small catchment mainly consist of sandy soil types besides organic soils along the streams. The aim of the study was to characterise the relative influence of soil type and land use on stream water quality. Nine snapshot sampling campaigns were undertaken during the growing season of 2009. Total dissolved nitrogen (TDN), nitrate (NO − 3 ), ammonium nitrogen and dissolved organic carbon (DOC) concentrations were measured, and dissolved organic nitrogen (DON) was calculated for each grabbed sample. Electrical conductivity, pH and flow velocity were measured during sampling. Statistical analyses showed significant differences between the northern, southern and converged stream parts, especially for NO − 3 concentrations with average values between 1.4 mg N l −1 and 9.6 mg N l −1 . Furthermore, throughout the sampling period DON concentrations increased to 2.8 mg N l −1 in the northern stream contributing up to 81 % to TDN. Multiple-linear regression analyses performed between chemical data and landscape characteristics showed a significant negative influence of organic soils on instream N concentrations and corresponding losses in spite of their overall minor share of the agricultural land (12.9 %). On the other hand, organic soil frequency was positively correlated to the corresponding DOC concentrations. Croplands also had a significant influence but with weaker correlations. For our case study we conclude that the fractions of coarse textured and organic soils have a major influence on N and DOC export in this intensively used landscape. Meanwhile, the contribution of DON to the total N losses was substantial.

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Trends in Dissolved Organic Carbon in UK Rivers and Lakes

Cited by 239 publications

References 52 publications

Organic phosphate in UK rivers and its relevance to algal and bryophyte surveys

Organic phosphate in UK rivers and its relevance to algal and bryophyte surveys

Exploring How Organic Matter Controls Structural Transformations in Natural Aquatic Nanocolloidal Dispersions

Spatial distribution of soils determines export of nitrogen and dissolved organic carbon from an intensively managed agricultural landscape

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