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Productivity and vitality of spruce stands: dynamic feedback simulation for responses to different annual and seasonal levels of magnesium supply from soil

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Abstract

Responses of Norway spruce stands to gradually decreased annual magnesium supply from soil, with two seasonal courses, are evaluated by computer simulation. At low supply, magnesium concentrations in the needles are reduced to levels inducing chlorosis, but annual growth of new needles remains at the same level as stands with adequate magnesium. Above-ground permanent biomass shows a decreased annual production with lower supply, mainly because of shorter net carbon gain caused by decreased assimilation which is due to magnesium deficiency in needles. An additional but less important reason is the magnesium deficiency in stem and branch cambium, which is most severe during summer at low magnesium supply rates. The interaction of magnesium and carbon balance is emphasized.

Modeling and simulation are not used for prediction but to test the consistency of scientific hypotheses.

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  1. Lehrstuhl für Landschaftsökologie, Technische Universität München-Weihenstephan, 8050, Freising 12, Germany

    P. Schall

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  1. P. Schall
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Schall, P. Productivity and vitality of spruce stands: dynamic feedback simulation for responses to different annual and seasonal levels of magnesium supply from soil. Vegetatio 92, 111–118 (1991). https://doi.org/10.1007/BF00036032

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  • DOI: https://doi.org/10.1007/BF00036032

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