Concentrations and fluxes of dissolved organic carbon in drainage water from an upland peat system

Scott, Matthew J.; Jones, Malcolm N.; Woof, C.; Tipping, Edward

doi:10.1016/s0160-4120(98)00043-9

Cited by 115 publications

(98 citation statements)

References 22 publications

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“…Correlations between less degraded OM fractions (i.e. amino sugars, amino acids, and non-humic-like chemical species) and aridity have previously been reported (Scott et al, 1998), agreeing with our interpretation of the OM molecular characteristics (higher chemical lability) found in the drier climate of the LGM. Conversely, OM in WD_3 was representative of more lignin-like species (Fig.…”

Section: Discussionsupporting

confidence: 92%

Climate driven carbon and microbial signatures through the last ice age

D’Andrilli¹,

Smith²,

Dieser³

et al. 2017

Geochem. Persp. Let.

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Section: Discussionsupporting

confidence: 92%

Climate driven carbon and microbial signatures through the last ice age

D’Andrilli¹,

Smith²,

Dieser³

et al. 2017

Geochem. Persp. Let.

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“…Ryan et al (1998) noted an immediate increase in soil pH and ammonium levels upon initial rewetting in experimental plots, suggesting increases in microbial activity. It is likely that the step changes reported in this paper reflected both drought effects on soil biogeochemistry, including effects on soil pH and the oxidation of organic sulphur as described by Scott et al (1998), and changes in enzyme activity, coupled with washout of high levels of available DOC in soil stores during the subsequent wet conditions (Fenner and Freeman, 2011).…”

Section: Discussionmentioning

confidence: 90%

“…The lowest estimated DOC concentration over the study period (2.7 mg C L -1 ) occurred during this extreme dry period. Scott et al (1998) reported low DOC production in soils during drought and attributed this to a decrease in microbial activity due to increased acidity following oxidation of organic sulphur to sulphate when oxygen availability increased in the soil. The step change analysis indicated that the initial step continued until November 2010, but that elevated DOC concentrations persisted into reported that step changes in DOC concentrations following drought in a UK peatland catchment could persist for 3-5 years.…”

Section: Discussionmentioning

confidence: 99%

Identifying the role of environmental drivers in organic carbon export from a forested peat catchment

Ryder

Eyto

Dillane

et al. 2014

Science of The Total Environment

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Highlights:1. Loads of 9.5 t DOC km 2 year -1 and 6.2 t POC km 2 year -1 were exported from peatland. 2.Climatic factors explained 59.7% and 58.3% of deviance in stream DOC and POC.3. Soil temperature, discharge and drought were significant drivers of DOC concentrations. 4.Soil temperature, stream discharge rainfall were significant drivers of POC concentrations.Key words: Peat catchment, dissolved organic carbon, particulate organic carbon, high resolution monitoring, climate effects. AbstractCarbon export in streams draining peat catchments represents a potential loss of carbon from longterm stores to downstream aquatic systems and ultimately, through mineralisation, to the atmosphere. There is now a large body of evidence that dissolved organic carbon (DOC) export has 2 increased significantly in recent decades at many sites, although there is still debate about the drivers of this increase. In this study, DOC export and particulate organic carbon (POC) export were quantified from a forested peatland catchment in the west of Ireland over two years at a fine temporal resolution. The principle drivers of change in stream DOC and POC concentrations were investigated using a general additive modelling (GAM) approach. The study period included drought conditions in early summer 2010 and clearfelling of some commercial forestry in early 2011. The results indicated that annual loads of 9.5 t DOC km 2 year -1 and 6.2 t POC km 2 year -1 were exported from the catchment in 2010. This combined annual load of 15.7 t C km 2 year -1 would represent between 0.01 % and 0.02 % of typical estimates for peat soil carbon storage in the region. Soil temperature, river discharge and drought explained 59.7 % the deviance in DOC concentrations, while soil temperature, river discharge, and rainfall were the significant drivers of variation in POC concentrations, explaining 58.3 % of deviance. Although clearfelling was not a significant factor in either model, large spikes in POC export occurred in 2011 after the first forestry clearance. The results illustrate the complexity of the interactions between climate and land management in driving stream water carbon export. They also highlight the sensitivity of peatland carbon stores to changes in temperature and precipitation, which are projected to be more extreme and variable under future climate scenarios.3

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“…The 0.45 µm filtration size was used as this pore size is the common definition for DOC including colloidal carbon (Koelmans and Prevo, 2003) and has been routinely used in numerous studies for DOC determination (e.g. Scott et al, 1998;Fujii et al, 1998;Chow et al, 2005).…”

Section: Water Analysismentioning

confidence: 99%

Fluvial organic carbon flux from an eroding peatland catchment, southern Pennines, UK

Pawson

Lord

Evans

et al. 2008

Hydrol. Earth Syst. Sci.

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Abstract. This study investigates for the first time the relative importance of dissolved organic carbon (DOC) and particulate organic carbon (POC) in the fluvial carbon flux from an actively eroding peatland catchment in the southern Pennines, UK. Event scale variability in DOC and POC was examined and the annual flux of fluvial organic carbon was estimated for the catchment. At the event scale, both DOC and POC were found to increase with discharge, with event based POC export accounting for 95% of flux in only 8% of the time. On an annual cycle, exports of 35.14 t organic carbon (OC) are estimated from the catchment, which represents an areal value of 92.47 g C m −2 a −1 . POC was the most significant form of organic carbon export, accounting for 80% of the estimated flux. This suggests that more research is required on both the fate of POC and the rates of POC export in eroding peatland catchments.

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Concentrations and fluxes of dissolved organic carbon in drainage water from an upland peat system

Cited by 115 publications

References 22 publications

Climate driven carbon and microbial signatures through the last ice age

Climate driven carbon and microbial signatures through the last ice age

Identifying the role of environmental drivers in organic carbon export from a forested peat catchment

Fluvial organic carbon flux from an eroding peatland catchment, southern Pennines, UK

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