The rate of and controls upon DOC loss in a peat catchment

Worrall, Fred; Burt, Tim; Adamson, J.

doi:10.1016/j.jhydrol.2005.08.019

Cited by 58 publications

(54 citation statements)

References 42 publications

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“…In Whitelee we have not sampled headwater drainage systems nor targeted event export, yet [DOC] is significantly higher than many other non-headwater UK drainage systems (e.g., Worrall et al, 2004;Evans et al, 2007;Baker et al, 2008). [DOC] in S-catchments is comparable to that observed in smaller headwater catchments intimately connected with the peat landscape (e.g., the Brocky data; Dawson et al, 2004;Worrall et al, 2006;Dawson and Smith, 2007), but not as high as [DOC] in drainage waters from Auchencorth Moss: mean of 38.6 mg C/L . Auchencorth is a 3.5 km 2 lowland ombotrophic raised bog only 25 km ENE from Whitelee.…”

Section: The Interaction Between Doc and Nutrient Exportmentioning

confidence: 99%

“…5a) for the samples from which nutrient concentrations are available, although it can be higher than this (unpublished data, Waldron; Dawson et al, 2004). Whilst each sample is a "snapshot" of DOC export and there may be considerable variation between samples depending on hydrological conditions (Grieve, 1994), this seasonal pattern of changing concentrations is observed elsewhere (e.g., Billett et al, 2004;Worrall et al, 2006), with highest concentrations in catchment outflow at the end of summer, after peak terrestrial productivity and strongly influenced by increased hydrological export (Tipping et al, 2007). Early summer 2007 was particularly wet in the UK (Fig.…”

Section: Doc and Poc Datamentioning

confidence: 99%

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The significance of organic carbon and nutrient export from peatland-dominated landscapes subject to disturbance, a stoichiometric perspective

et al. 2009

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Abstract. The terrestrial-aquatic interface is a crucial environment in which to consider the fate of exported terrestrial carbon in the aquatic system. Here the fate of dissolved organic carbon (DOC) may be controlled by nutrient availability. However, peat-dominated headwater catchments are normally of low nutrient status and thus there is little data on how DOC and nutrient export co-varies. We present nutrient and DOC data for two UK catchments dominated by peat headwaters. One, Whitelee, is undergoing development for Europe's largest windfarm. Glen Dye by comparison is relatively undisturbed. At both sites there are significant linear relationships between DOC and soluble reactive phosphorus and nitrate concentrations in the drainage waters. However, inter-catchment differences exist. Changes in the pattern of nutrient and carbon export at Whitelee reveal that landscape disturbance associated with windfarm development impacts the receiving waters, and that nutrient export does not increase in a stoichiometric manner that will promote increase in microbial biomass but rather supports aquatic respiration. In turn greater CO 2 efflux may prevail. Hence disturbance of terrestrial carbon stores may impact the both the aquatic and gaseous carbon cycle. We suggest estimates of aquatic carbon export should inform the decision-making process prior to development in ecosystems and catchments with high terrestrial carbon storage.

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Section: The Interaction Between Doc and Nutrient Exportmentioning

confidence: 99%

Section: Doc and Poc Datamentioning

confidence: 99%

The significance of organic carbon and nutrient export from peatland-dominated landscapes subject to disturbance, a stoichiometric perspective

et al. 2009

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“…Runoff emerging from blanket peat catchments suffers from several water quality problems, including high concentrations of dissolved organic carbon which is associated with discolouration. In the UK, which hosts 15 % of the world's blanket peat deposit, the headwater blanket peats are sources for large quantities of solutional discolouring organics, which are an expensive and growing problem for water supply companies (Mitchell and McDonald, 1992;Mitchell and McDonald, 1995;Mitchell, 1990;Worrall et al, 2003;Worrall et al, 2006). Understanding flow through differently sized peat pores would enable us to improve our transport models, and our understanding of dissolved organic carbon production and solute transport.…”

Section: Introductionmentioning

confidence: 99%

Flow through macropores of different size classes in blanket peat

Holden

2009

Journal of Hydrology

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between those pores between 0.25 mm and 1 mm in diameter those pores greater than 1 mm in diameter. Most of the flow in upland blanket peat was generated from only a small volume of the peat. At the surface around 80 % of flux was generated through only 0.26 % of the peat volume while at 5 cm depth, while percolation rates were an order of magnitude slower than at the surface, 85 % of the flux was generated from only 0.01% of the peat volume. Infiltration and effective porosity both declined by over two orders of magnitude over the top 20 cm of the peat. The variability in flow and effective porosity was found to be similar between different pore size classes.1

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“…Unlike previous PCA studies within this catchment (e.g. Worrall et al,149 2003b; Worrall et al, 2006) this study did not utilise alkalinity data as there were over 3900 missing 150 values. Another PCA was carried out separately, using only the conservative ions calcium chloride 151 magnesium, potassium and sodium, and the same three sources were found to be the end-members, 152…”

mentioning

confidence: 99%

“…The DOC concentrations across the catchment were modelled and calculated based upon end-member 124 mixing analysis (EMMA - Christophersen and Hooper, 1992) and the approach of the previous study on 125 DOC removal within this catchment (Worrall et al, 2006), by using principal component analysis (PCA). approach and a similar method was used in this study.…”

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confidence: 99%