A model of solid‐solution interactions in acid organic soils, based on the complexation properties of humic substances

Tipping, Edward; Hurley, Margaret Anne

doi:10.1111/j.1365-2389.1988.tb01235.x

Cited by 151 publications

(86 citation statements)

References 13 publications

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“…Previous studies (e.g. Krug and Frink, 1983;Tipping and Hurley, 1988) have suggested an inverse link between mineral acid inputs and the leaching of organic acidity (and hence DOC) to runoff. It is thus possible that increased DOC concentrations in the UK represent a response to reductions in soil and stream acidity over the last 12 years.…”

Section: Discussionmentioning

confidence: 99%

Chemical trends at lakes and streams in the UK Acid Waters Monitoring Network, 1988-2000: Evidence for recent recovery at a national scale

Evans

Monteith

2001

Hydrol. Earth Syst. Sci.

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A detailed trend analysis of 12 years of data (1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000) for 22 surface waters in acid-sensitive regions of the United Kingdom, in which individual site data have been combined to identify national-scale trends, has shown strong common patterns of temporal variation. Results suggest a widespread reduction in sulphate concentrations, hydrogen ion and inorganic aluminium species, and increases in acid neutralising capacity. Many chemical changes have not been linear. However, the first five years were characterised by high concentrations of marine ions and relatively stable pollutant sulphate concentrations and the remaining period by lower concentrations of marine ions and declining sulphate. Genuine 'recovery', in terms of declining acidity in response to reduced anthropogenic sulphur deposition is only apparent, therefore, for the latter part of the monitoring period. Reductions in calcium concentrations appear to have partially offset the influence of sulphate reductions on acidity, as have increases in organic acidity associated with strong and widespread rising trends in dissolved organic carbon. Fluctuations in a number of climatic factors over the monitoring period have led to significant inter-annual variability in nitrate, which exhibits little longterm trend, marine ions and acidity, emphasising the need for long monitoring periods if underlying trends are to be correctly identified.

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Section: Discussionmentioning

confidence: 99%

Chemical trends at lakes and streams in the UK Acid Waters Monitoring Network, 1988-2000: Evidence for recent recovery at a national scale

Evans

Monteith

2001

Hydrol. Earth Syst. Sci.

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“…A key factor in the release of DOM is the net electrical charge ( Tipping and Hurley, 1988) which is a general property of polyelectrolytes. Hence, the solid organic matter must be altered in terms of an increasing net electrical charge to be released into soil solution.…”

Section: Introductionmentioning

confidence: 99%

Mobilization and immobilization of dissolved organic matter in forest soils

Guggenberger

Kaiser

Zech

1998

J Plant Nutrition & Soil

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Summary -ZusammenfassungField and laboratory studies combined with destructive and nondestructive analytical methods were used to characterize dissolved organic matter (DOM) in acid forest soils. DOM is produced in significant amounts in the forest canopy and in the forest floor. A mGor part of the organic solutes are lignocellulose-delpadation products being strongly microbially altered in the course of ligninolysis. The release of tignin-derived moieties into the soil solution is controlled by their degree of biooxidation. Microorganisms contribute also directly to the organic solutes through the release of microbial metabolites. DOM released from the f o r d floor passes the upper mineral soil almost conservatively, whereas in the subsoil most DOM is removed from solution. Immobilization of DOM is mainly due to sorption on Fe and Al oxides. The highly oxidized lipinderived moieties are preferentially removed from the soil solution whereas the saccharides are relatively enriched. We condude that DOM in the forest soil output to the hydrosphere is a result of (1) the release of microbially degraded lignocellulose compounds and of microbial metabolites into the for& floor solution and (2) selective sorptive removal of the lignin-derived constituents in the subsoil.

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“…In such cases, factors such as climatic variability and longterm changes in pollutant deposition can dominate variations in water quality (Neal et al, 2004a, b and c) In common with many upland catchments across the UK , DOC concentrations have increased in both the moorland and forest streams over the last 20 years. This may be associated with increasing mobilisation of organic acids in response to a decrease in mineral acid inputs (Krug and Frink, 1983;Tipping and Hurley, 1988). However, it has been suggested that climatic controls are more important (Freeman et al, 2001), given that increases in DOC are observed at sites which have received relatively little acid deposition (Worral et al, in press).…”

Section: Discussionmentioning

confidence: 99%

Long-term changes in precipitation and stream water chemistry in small forest and moorland catchments at Beddgelert Forest, north Wales

Reynolds

Stevens

Brittain

et al. 2004

Hydrol. Earth Syst. Sci.

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Changes in the chemistry of bulk precipitation and stream water between 1982 and 2000 are described for small moorland and forest catchments located within Beddgelert Forest in north Wales. Two forest catchments were partially clearfelled in 1984 (D2; 68% and D4; 28%) whilst a third (D3) remained as an unfelled control until autumn / winter 1998/99 when partial felling took place in the headwaters. Over the monitoring period, the annual mean pH of bulk precipitation increased from 4.6 to 5.1 whilst the annual mean non-seasalt sulphate concentration decreased from 0.53 mg S l 1 in 1985 to 0.24 mg S l 1 in 2000. Since 1985, the annual wet deposition flux of non-seasalt sulphur decreased by 50% to 8.4 kg S ha 1 yr 1 in 2000. Annual mean inorganic nitrogen concentrations and annual wet deposition fluxes have remained relatively unchanged since 1982. The decrease in atmospheric sulphur deposition is reflected by decreased annual mean concentrations of non-seasalt sulphur, acidity, aluminium and calcium in all four streams irrespective of clearfelling activities. Annual variations in nitrate-N and potassium concentrations in the forest streams, largely determined by pulses of leaching following forest clearance, had no effect on stream acidity. In common with UK upland catchments, annual mean concentrations of dissolved organic carbon have increased from about 1 mg C l 1 in 1985 to between 1.5 and 2 mg C l 1 in 2000, although there is considerable year to year variability. Two boreholes drilled adjacent to catchments D3 and D4 have confirmed the presence of alkaline, base rich groundwater at Beddgelert. Although the boreholes are only 150 m apart, there are large differences in chemistry suggesting that different groundwater reservoirs have been intercepted providing further evidence of the complexity and heterogeneity of groundwater systems in upland catchments.

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A model of solid‐solution interactions in acid organic soils, based on the complexation properties of humic substances

Cited by 151 publications

References 13 publications

Chemical trends at lakes and streams in the UK Acid Waters Monitoring Network, 1988-2000: Evidence for recent recovery at a national scale

Chemical trends at lakes and streams in the UK Acid Waters Monitoring Network, 1988-2000: Evidence for recent recovery at a national scale

Mobilization and immobilization of dissolved organic matter in forest soils

Long-term changes in precipitation and stream water chemistry in small forest and moorland catchments at Beddgelert Forest, north Wales

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