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• W2087663397 abstract "The effects of a 3 year conifer harvesting programme on stream-water quality are described for the acidic and acid-sensitive Afon Hore catchment. Nitrate and potassium concentrations, initially almost quadrupled, have remained high for 4 years from the commencement of the harvesting programme. For the undisturbed (control) system, the fluctuations are small and peak during the winter months. With harvesting, a phase change takes place and peak concentrations occur during the autumn period. A similar pattern, but with no phase shift, is observed for dissolved organic matter, although concentrations increase less: peak concentrations occur during the summer to autumn periods. During the first 2 years of felling, aluminium concentrations increase in the winter period: after that, concentration differences are much smaller. During the summer base-flow period, alkalinity and calcium values decrease. Sodium and chloride concentrations increase with time owing to a corresponding increase in the rainfall input. This trend is not observed for the stream in the felled catchment. For sulphate, there is a general decline in concentration for both the control and felled areas. With felling, a seasonal pattern has been introduced: the lowest concentrations occur in winter. The results are interpreted in terms of: (1) reduced atmospheric scavenging of sea salt and sulphur due to the loss of the trees; (2) increased losses of the nutrients from the soils due to reduced uptake by the vegetation; (3) increased aluminium releases from the soil's cation exchange store following increased total inorganic anion concentrations resulting from nitrate generation from (2); (4) a reduced contribution of ground water to the stream or an increased acidification of the ground water. The results are discussed in relation to environmental and water management issues. Nitrate production will probably not be of importance to either, owing to the low levels found in the stream. The increase in aluminium may extend the length of the stream where less favourable biological conditions prevail. There are potential water treatment problems for sensitive catchments due to manganese, dissolved organic carbon (colour), bromide and iodide generation during deforestation." @default.
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• W2087663397 date "1992-07-01" @default.
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• W2087663397 title "The effects of tree harvesting on stream-water quality at an acidic and acid-sensitive spruce forested area: Plynlimon, mid-Wales" @default.
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• W2087663397 doi "https://doi.org/10.1016/0022-1694(92)90093-b" @default.
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