Organic Versus Anthropogenic Acidity in Tributaries of the Kejimkujik Watersheds in Western Nova Scotia

Kerekes, Joseph J.; Beauchamp, S.; Tordon, R.; Tremblay, Charles Charrier; Pollock, T.

doi:10.1007/978-94-009-3385-9_123

Cited by 26 publications

(23 citation statements)

References 4 publications

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“…6), which may possess relatively high proportions of low molecular mass organics (Likens et al 1983). Water is enriched with DOC as it passes through forest canopies, Clair & Freedman (1986);Cronan & Aiken (1985); Dahm (1980); David & Driscoll (1984); Driscoll et al (1987);Eaton et al (1976);Eckhardt & Moore (1990); Eshleman & Hemond (1985); Fahey et al (1988);Foster & Grieve (1982); Gorham et al (1984);Grieve (1984); Heikkinen (1990);Hoffman et al (1980); Kaplan et al (1980); Kerekes et al (1986);Likens et al (1983);Marin et al (1990);McDowell & Likens (1986);M&right et al (1985); Moore (1987bMoore ( , 1989; Moore & Jackson (1989);Mulholland (1981);Naiman (1982); Sollins & McCorison (1981); Tate & Meyer (1983); Urban et al (1989);Velinsky et al (1986);Wallis et al (1981).…”

Section: Discussionmentioning

confidence: 96%

Sources and sinks of dissolved organic carbon in a forested swamp catchment

1991

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Abstract. Concentrations of dissolved organic carbon (DOC) were measured in precipitation, throughfall, stemflow, and soil, peat and stream water in a 50 ha catchment with a central 5 ha swamp at Mont St. Hilaire, Quebec. DOC concentrations in precipitation were low (2.0 mg L-l), but increased in passage through the tree canopies as throughfall (9.1-14.6 mg L-l) and stemflow (23.1-30.1 mg L-l). For the period July l-November 15, 1987, 0.5 g DOC m-* was imported as precipitation, and forest canopies contributed a further 1.4-1.7 g mP2 to the soil surface. DOC concentrations were higher (46.0 and 67.6 mg L-l) in upland soil organic horizons, but decreased with depth because subsoil mineral horizons acted as a major sink of DOC. A laboratory experiment using leaf leachate revealed that subsoil horizons were able to adsorb DOC, with equilibrium DOC concentrations ranging from 3 to 19 mg L-'. Soil organic carbon appeared to be an important determinant of equilibrium DOC concentrations. The swamp was a major source of DOC. with an overall average DOC concentration of 58.6 mg L-' and showed strong spatial and temporal variations related to hydrologic and thermal regimes. During base flow periods, stream DOC concentrations were small ( < 3 mg L-l), dominated by water fed from springs draining upland soils. During high flows, stream DOC concentrations increased through the contribution of DOC-rich water originating in the swamp. Sources, sinks and transport of DOC are thus a function of a complex set of inter-related biotic and abiotic process.

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Section: Discussionmentioning

confidence: 96%

Sources and sinks of dissolved organic carbon in a forested swamp catchment

1991

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“…Estimation of DOC concentration from water colour determined as Hazen has been used in several previous studies (e.g. Kerekes et al 1986, Eatherall et al 1998, Worrall et al 2003b, and this approach was adopted here. This method is based on standardised absorption and produces estimates of humic coloured DOC.…”

Section: Runoff Model Validationmentioning

confidence: 99%

Increases in humic dissolved organic carbon export from upland peat catchments: the role of temperature, declining sulphur deposition and changes in land management

Yallop

Clutterbuck²,

Thacker³

2010

Clim. Res.

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Peat soils represent a highly significant carbon store and are usually assumed to serve as net sinks within carbon budgets for climate modelling. However, marked increases in dissolved organic carbon (DOC) concentrations in upland peat drainage waters over the past few decades are widespread in England. This suggests that the assumed sink status of some upland peats could be changing, although, as these observations are seldom quantified into actual carbon flux measurements, their overall importance is difficult to gauge. We investigated the fluvial export of the humic component of DOC (hDOC) from 3 South Pennine catchments and found that the actual carbon export via this pathway has doubled over the last 3 decades. Temperature increases to date appear poorly related to this change. Declining sulphur deposition was more strongly related (inversely), but was not a significant determinant in any of the catchments. The major driver for elevated hDOC export appears to be changes in local land management, namely the extensive use of burning for grouse moor management. Substitution of increased hDOC export into published carbon budget models for upland peat environments imply the study sites have shifted from carbon sinks to net sources over the examined period. This suggests that moorland burning, where undertaken on blanket peat, is incompatible with the ecosystem services these landscapes are presumed to provide and that ideas about the role of upland peat moorland in regional and national carbon cycling need reappraisal.KEY WORDS: Water colour · Humic · DOC · Carbon · Loss · Export · Source · Peatland · FireResale or republication not permitted without written consent of the publisher

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“…Sulfate uptake and retention in wetlands have received attention as a source of alkalinity which may offset acid deposition (Hemond 1980;Kerekes et al 1986;Urban & Bayley 1986;Bayley & Schindler 1987). Hemond (1980) reported that SO; uptake within Thoreau's Bog in Massachusetts neutralized 64% of atmospherically deposited acidity.…”

Section: Introductionmentioning

confidence: 99%

Sulfur cycling in a forested Sphagnum bog in northern Minnesota

1989

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Abstract.The mass balance and internal cycle of sulfur within a small forested, Sphagnum bog in northern Minnesota are presented here based on a 4-year record of hydrologic inputs and outputs (precipitation, throughfall, streamflow, upland runoff) and a 3-year measurement of plant growth and sulfur uptake. Concentrations and accumulation rates of inorganic and organic sulfur species were measured in porewater. The bog is a large sink for sulfur, retaining 37% of the total sulfur input. Because of the relatively large export of organic S (21% of inputs), retention efficiency for total-S (organic S + SO:; 37%) is less than that for SOT (58%). There is a dynamic cycle of oxidation and reduction within the bog. Annual oxidation and recycling of S is equal to total inputs in the center of the bog. Plants receive 47% of their uptake requirement from atmospheric deposition, 5% from retranslocation from foliage, and the remainder from sulfur remineralized from peat. Mineralization is most intense in the aerobic zone above the water table. Inorganic sulfur species comprise < 5% of the total sulfur burden within the peat.

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Organic Versus Anthropogenic Acidity in Tributaries of the Kejimkujik Watersheds in Western Nova Scotia

Cited by 26 publications

References 4 publications

Sources and sinks of dissolved organic carbon in a forested swamp catchment

Sources and sinks of dissolved organic carbon in a forested swamp catchment

Increases in humic dissolved organic carbon export from upland peat catchments: the role of temperature, declining sulphur deposition and changes in land management

Sulfur cycling in a forested Sphagnum bog in northern Minnesota

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