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| Titel |
Cycling of nutrient base cations in a twelve year old Sitka spruce plantation in upland mid-Wales |
| VerfasserIn |
B. Reynolds, M. J. Wood, A. M. Truscott, S. A. Brittain, D. L. Williams |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 4, no. 2 ; Nr. 4, no. 2, S.311-321 |
| Datensatznummer |
250001636
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| Publikation (Nr.) |
 copernicus.org/hess-4-311-2000.pdf |
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| Zusammenfassung |
| The effects of the early growth of plantation forestry on the biogeochemical
cycling of potassium, calcium and magnesium have been investigated in a stand of 12 year
old Sitka spruce and adjacent moorland growing on acid peaty podzol soils in mid Wales.
Element budgets have been calculated for both systems using measurements of soil and
vegetation base cation pools and fluxes. In the moorland, the magnesium budget is
approximately at steady-state with no net change to the soil store whilst the soil is
accumulating potassium. The calcium budget is approximately balanced but contains
significant uncertainties due to between plot variability in calcium leaching losses.
Afforestation has greatly increased the above-ground living biomass which holds 7 to
15 times more nutrients compared to the living aerial biomass in the moorland. With the
exception of magnesium, the base cation stores within the forest soil are being depleted
as the increase in atmospheric deposition due to the forest canopy provides only a small
offset to the much larger accumulation of base cations within the trees. The current net
rate of change in the soil store of calcium is sustainable for only 65 years. However,
as the trees mature, their demand for calcium will be reduced and they should be able
to ‘tap' deeper sources of calcium in the soil profile as well as in the drift and
regolith material.
Keywords: Forestry, base cations, element cycling, calcium, magnesium, potassium |
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