Land management as a factor controlling dissolved organic carbon release from upland peat soils 1: Spatial variation in DOC productivity

Yallop, Adrian R.; Clutterbuck, B.

doi:10.1016/j.scitotenv.2009.03.012

Cited by 97 publications

(73 citation statements)

References 40 publications

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“…At local scales, temperature affects peat decomposition rates and therefore the availability of DOC, 20 while higher precipitation increases the washout of DOC from soils (Jennings et al, 2010;Ryder et al, 2014). Increases in oxygen availability within peat during droughts can also lead to higher rates of aerobic decomposition (Fenner and Freeman, 2011;Yallop and Clutterbuck, 2009;Mitchell and McDonald, 1992), and may also trigger an enzymatic latch mechanism (Freeman et al, 2001a), where phenolic oxidase activity is switched on in the soil pore waters, reducing the concentration of inhibitory phenolic compounds. At regional scales, DOC concentrations have been shown to be influenced by global weather 25 patterns, for example, certain Canadian lakes have been shown to correlate with climate indices such as the Pacific Decadal Oscillation and the Southern Oscillation Index (Zhang et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Synchrony in catchment stream colour levels is driven by both local and regional climate

Doyle¹,

Eyto²,

Dillane³

et al. 2018

Preprint

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Abstract. Streams draining upland catchments mobilise significant loads of carbon from terrestrial reservoirs to downstream freshwater and marine aquatic ecosystems and ultimately, via a range of biotic and abiotic processes, to the atmosphere. 5There are increasing concerns over the long-term stability of terrestrial carbon stores in blanket peatland catchments as a result of anthropogenic pressures and climate change. We analysed sub-annual and inter-annual changes in river water colour (a reliable proxy measurement of dissolved organic carbon (DOC)) using six years of weekly data (2011 to 2016) from three contiguous river sub-catchments (Black, Glenamong and Srahrevagh) in a blanket peatland catchment system in western Ireland, assessing differences in catchment characteristics and in the drivers of temporal change. General additive mixed 10 modelling was used to identify the principle environmental drivers controlling changes in colour concentration in the rivers, while wavelet cross correlation analysis was used to identify common frequencies. Although at 130 mg PtCo L -1 , the colour levels in the Srahrevagh (the subcatchment with lower rainfall and higher forest cover) were almost 50% higher than those from the Black and Glenamong, 95 and 84 mg Pt Co L -1 respectively. The decomposition of the colour datasets revealed similar multi-annual, annual, and event-based (random component) trends, illustrating that environmental drivers operated 15 synchronously at each of these temporal scales, and also spatially within the same catchment. For the Black and its nested Srahrevagh catchment, soil temperature, soil moisture deficit and the weekly North Atlantic Oscillation (NAO) explained 54% and 58% of the deviance in colour respectively. In the Glenamong, which had steeper topography and a higher percentage of peat intersected by streams, soil temperature, log of discharge and the NAO explained 66% of the colour concentrations. Cross-wavelet time-series analysis between river colour and each environmental driver revealed a significant 20 high common power relationship at an annual time step. Each each relationship however, varied in phase, further highlighting the complexity of the mechanisms driving river colour in the sub-catchments. The estimated mean annual DOC loads for the Black and Glenamong rivers to Lough Feeagh were 15 t C km 2 yr -1 and 14.7 t C km 2 yr -1 respectively, although the export values displayed significant inter-annual variation. The results of the study highlight the interaction of catchment conditions and regional meteorological drivers of aquatic carbon export and, therefore the vulnerability of blanket peatland 25 carbon stores to changes in temperature and precipitation. These changes are presently being observed and are predicted to become increasingly extreme and variable.

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Section: Introductionmentioning

confidence: 99%

Synchrony in catchment stream colour levels is driven by both local and regional climate

Doyle¹,

Eyto²,

Dillane³

et al. 2018

Preprint

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“…Such decreases in acidity may result in an increase in microbial activity in soils (Andersson et al, 2000). However, an increase in oxygen availability within soil during droughts can also lead to higher rates of aerobic decomposition (Fenner and Freeman, 2011;Yallop et al, 2009;Mitchell and McDonald, 1992), and may also trigger an enzymic latch mechanism as described by Freeman et al (2001 b), where phenolic oxidase activity is switched on in the soil porewaters, reducing the concentration of inhibitory phenolic compounds.…”

Section: Introductionmentioning

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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“…Garnett et al 2000) 39 and deterioration of catchment-scale water quality (e.g. Yallop & Clutterbuck 2009). However, the 40 debate about burning is increasingly moving away from a discussion of 'to-burn or not-to-burn' to a 41 debate about when it is most appropriate/sustainable, from an environmental perspective, to burn 42 heathland on differing soil types (Bain et al 2011).…”

Section: Introduction 27mentioning

confidence: 99%

Calluna vulgaris canopy height and blanket peat CO2 flux: Implications for management

Dixon

Worrall

Rowson

et al. 2015

Ecological Engineering

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8This study seeks to address the proposition that the canopy height of Calluna vulgaris is a measure of 9 the CO2 balance of heathlands on ombrotrophic peatlands and thus can be used as an objective tool to 10 define when to manage (typically by prescribed burning) heathlands. To test this idea a monthly dataset 11 of CO2 flux and associated environmental variables was gathered from three localities in the South 12Pennines and the Peak District National Park of northern England between 2007 and 2010, covering a 13 range of C. vulgaris canopy heights. It was found that both gross fluxes of CO2 (ecosystem respiration 14 and photosynthesis) were modelled best by models incorporating a dependence on canopy height. 15

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Land management as a factor controlling dissolved organic carbon release from upland peat soils 1: Spatial variation in DOC productivity

Cited by 97 publications

References 40 publications

Synchrony in catchment stream colour levels is driven by both local and regional climate

Synchrony in catchment stream colour levels is driven by both local and regional climate

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

Calluna vulgaris canopy height and blanket peat CO2 flux: Implications for management

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