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Comparison of the Hydrological Budgets and Detailed Hydrological Responses in Two Forested Catchments
Soils Division, The Macaulay Land Use Research Institute Aberdeen, AB9 2QJ. Scotland
Detailed hydrological budgets for two mature forested catchments show very similar inputs and vegetational throughputs (throughfall and stemflow) for both Norway and Sitka spruce. Stream outflow, equivalent to 1707 mm, is comparable both with measured rainfall inputs (2250 mm) or rainfall in combination with throughfall and stemflow (1826 mm). Soil throughflow from the differing soil profiles follows similar patterns, in both soil types with initial flow response at depth (>50 cm). This may increase towards a maximum for some horizons, and, depending on input amounts, be followed by a transfer of flow up through the profile. Hydrological responses and their effect on soil temperatures were again similar at both sites, with no obvious anomalies which would explain the resultant differences in stream chemistry between these catchments. The observed changes in surface water chemistry must therefore be primarily due to vegetational or soil induced chemical processes combined with observed differences in hydrological fluxes.
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