Summary
A significantly lower growth was found in a Norway spruce stand where some of the trees are becoming yellow, in comparison to a similar stand composed of green trees. The growth loss can only be explained by lower photosynthesis of yellow foliage because the green foliage in both stands photosynthesized similarly, and no difference in production below ground was detected. The yellowing of the foliage is a result of lower Mg++ uptake and, thus, lower Mg++ concentration in the foliage of the trees in the declining stand, including the foliage green trees. Correction of the leaf area index of the declining site, to account for the reduced productivity of the canopy, will result in a production which is appropriate for this effective leaf area index.
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© 1988 ECSC, EEC, EAEC, Brussels and Luxembourg
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Oren, R., Schulze, ED., Schneider, U., Werk, K.S., Meyer, J. (1988). Carbon Assimilation and Nutrition of Trees in Two Picea Abies (L.) Karst. Stands in Bavaria Exhibiting Apparent Decline Differences. In: Mathy, P. (eds) Air Pollution and Ecosystems. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4003-1_122
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DOI: https://doi.org/10.1007/978-94-009-4003-1_122
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