Quantifying the effects of forestry practices on the recovery of upland streams and lochs from acidification

Harriman, R.; Watt, A. W.; Christie, A. E. G.; Moore, Dames; McCartney, A.G.; Taylor, E.M.

doi:10.1016/s0048-9697(02)00626-5

Cited by 33 publications

(28 citation statements)

References 17 publications

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“…Moreover, 10 years earlier, sulphate suppression of DOC export may have been more eVective, as relatively lower DOC concentration increases and no signiWcant change in amplitude range were observed in the early part of the time series during the 1988-1990 felling years at Burn 10. Harriman et al (2003) found that DOC trends in surface waters draining forests and moorlands were similar, and concluded that forest impacts on DOC export were relatively minor, as at Loch Ard between Burn 2 (moorland) and Burn 10 (forested). This might be the case except during certain periods when soil physicochemical conditions are appropriate to accentuate disturbance of soil processes such as occurred at the Burn 11 catchment.…”

Section: Long-term Trends In Doc Concentrationmentioning

confidence: 98%

Influence of hydrology and seasonality on DOC exports from three contrasting upland catchments

et al. 2008

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Variation in dissolved organic carbon (DOC) concentrations of surface waters is a consequence of process changes in the surrounding terrestrial environment, both within annual cycles and over the longer term. Long-term records (1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005)(2006) of DOC concentrations at six catchments (0.44-10.0 km 2 ) across a climatic transect in Scotland were investigated for intra-annual relationships to evaluate potential long-term seasonal patterns. The intra-annual mode of DOC export contrasted markedly between catchments and appeared dependent on their hydrological characteristics. Catchments in wetter Central Scotland with high rainfall-runoV ratios, short transit times and well-connected responsive soils show a distinct annual periodicity in DOC concentrations throughout the long-term datasets. Increased DOC concentrations occurred between June and November with correspondingly lower DOC concentrations from December to May. This appears unrelated to discharge, and is dependent mainly on higher temperatures driving biological activity, increasing decomposition of available organic matter and solubility of DOC. The drier eastern catchments have lower rainfall-runoV ratios, longer transit times and annual drying-wetting regimes linked to changing connectivity of soils. These are characterised by seasonal DOC concentration-discharge relationships with an autumnal Xush of DOC. Temperature inXuences the availability of organic matter for DOC transport producing a high DOC concentration-discharge relationship in summer/autumn and low DOC concentration-discharge relationship in winter/spring. These two distinct modes of seasonal DOC transport have important implications for understanding changes in DOC concentrations and export brought about by climate change (temperature and precipitation) and modelling of aquatic carbon losses from soil-types under diVerent hydrological regimes.

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Section: Long-term Trends In Doc Concentrationmentioning

confidence: 98%

Influence of hydrology and seasonality on DOC exports from three contrasting upland catchments

et al. 2008

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“…In addition, tall forest canopies have been shown to increase loadings of atmospherically-derived acidic oxide pollutants by dry and occult deposition and thus, play a role in soil and surface water acidification (Hornung et al, 1986;Soulsby and Reynolds, 1992;Neal et al, 1997). More recently, as many of these new forests are harvested at the end of 40-50 year rotations, clear-felling operations have been shown to have a range of impacts including increased runoff (Roberts and Crane, 1997), fine sediment mobilization (Johnson and Whitehead, 1993) and increased nutrient leaching, particularly of nitrate, and concomitant acidification (Neal et al, 1992;Harriman et al, 2003). However, the exact nature of impacts vary massively, depending upon catchment characteristics; the precise nature and timing of the forest management operations; their location within a catchment, the proportion of the catchment affected and prevailing climatic conditions (Neal et al, 2004a,b).…”

Section: Introductionmentioning

confidence: 99%

Influence of forestry, environmental change and climatic variability on the hydrology, hydrochemistry and residence times of upland catchments

Tetzlaff¹,

Malcolm²,

Soulsby³

2007

Journal of Hydrology

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“…However, Evans and Monteith (2001) note that with only a small number of forest sites in the UK AWMN and considerable inter-site heterogeneity, it is difficult to generalise the effects of forestry on recovery from acidification. In a study of Scottish forest catchments, felling appeared to accelerate recovery trends with respect to acidifying components although forest streams were still more acid and contained higher concentrations of labile aluminium compared to moorland catchments (Harriman et al, 2003). At Beddgelert, the clear geochemical differences between D6 and the forest streams and the effects of clear felling are confounding factors in a forest-moorland comparison of acidity trends.…”

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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Quantifying the effects of forestry practices on the recovery of upland streams and lochs from acidification

Cited by 33 publications

References 17 publications

Influence of hydrology and seasonality on DOC exports from three contrasting upland catchments

Influence of hydrology and seasonality on DOC exports from three contrasting upland catchments

Influence of forestry, environmental change and climatic variability on the hydrology, hydrochemistry and residence times of upland catchments

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

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