Element turnover in a heavily damaged Norway spruce ecosystem influenced by N deposition |
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Authors: | W Schaaf W Zech |
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Institution: | (1) Soil Protection and Recultivation, Technical University of Cottbus, P.O. Box 101344, 03013 Cottbus, Germany;(2) Institute of Soil Science and Soil Geography, University of Bayreuth, P.O. Box 101251, W-8580 Bayreuth, Germany |
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Abstract: | Element budgets of a heavily damaged Norway spruce ecosystem at Hohe Matzen in the Fichtel Mountains/FRG were studied over 3 years. The trees show severe symptoms of decline and Mg deficiency. The soil is a typic Dystrochrept derived from granite with sandy texture, high stone content, and low base saturation. The budgets show high releases of N, S and Al from the ecosystem as a result of input, buffering and turnover processes. After an increase of proton fluxes in the organic surface layer, a strong reduction of protons in the B horizon was found. This process was accompanied by the release of Al, whereas reactive Al(OH)3 was exhausted in the A horizon. The low ANC is also shown in pH-stat.-titrations. The data indicate a strong mineralisation in the humus layer, which results in a net release of NH4, SO4 and TOC. Nitrification takes place mainly in the A horizon. With respect to the N-budget, the ecosystem is approaching the state of N saturation. The processes of N turnover lead to an internal proton production exceeding the atmospheric input, and thus contributing to soil acidification. |
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Keywords: | acid buffering element budget N-saturation N-turnover Norway spruce mineralisation typical Dystrochrept |
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