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Forestry 1993 66(1):51-68; doi:10.1093/forestry/66.1.51
© 1993 by Institute of Chartered Foresters
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Soil Solution Chemistry and Throughfall Under Adjacent Stands of Japanese Larch and Sitka Spruce at Three Contrasting Locations in Britain

J. K. ADAMSON1, M. HORNUNG1, V. H. KENNEDY1, D. A. NORRIS2, I. S. PATERSON3 and P. A. STEVENS2

1 Institute of Terrestrial Ecology, Merlewood Research Station Windermere Road, Grangeover-Sands, Cumbria, LA11 6JU, England
2 Institute of Terrestrial Ecology, Bangor Research Unit, University College of North Wales Deiniol Road, Bangor, Gwynedd, LL57 2LQ, Wales
3 Institute of Terrestrial Ecology, Banchory Research Station, Hill of Brathens Glassel, Banchory, Kincardineshire, AB31 4BY, Scotland

Soil solution and throughfall chemistry were investigated in adjacent stands of Japanese larch and Sitka spruce at three sites in Britain. Throughfall was collected in open funnel collectors and soil solution was collected using tensionless tray lysimeters at the base of the H horizon and ceramic cup suction samplers at the base of the B horizon. Sampling took place fortnightly for 14 months and samples were analysed for the major ions and dissolved organic carbon. Most ions were present in higher concentrations under spruce than larch. Most notably under the spruce at all sites SO4 in throughfall and NO3 Ca and Al in the B horizon were present in greater concentrations. However there were no trends in fortnightly concentrations of any ion, associated with the presence and absence of needles on the larch. When solutes are expressed as fluxes the only consistent effect of species on the B horizon is higher quantities of NO3 and NH4 under spruce. The study suggests that in areas exposed to atmospheric pollution, thinned stands of larch could have a beneficial role relative to Sitka spruce, in the maintenance of low acidity and aluminium concentrations in drainage water.

Received 7 February 1992.
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