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By P. Lelong

ISBN-10: 3540042415

ISBN-13: 9783540042419

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Concerning the potential future climatic change, Thomasius (1997) presumes that species at the limits of their ecological amplitudes will be more endangered than those inhabiting sites within their optimum range. g. the pioneers birch and pine) more strongly into silvicultural planning. However, possibilities to do so are limited, given the still greatly important goal of wood production. The focal point of species selection in German forests Site quality and enviromental changes 39 will most probably remain with the economically most important species spruce (Picea abies), beech (Fagus sylvatica) and oaks (Quercus robur and Q.

From Plochmann 1979, original in the National Musellm of Bavaria, Munich. While site quality and forest ecosystem structure suffered impairment during centuries of exploitation, the modern European land-use pattern and in fact modern civilization were formed during those days. Forest management in general was not sustainable. Rural and urban ecosystems were developed and sustained at the expense of forest ecosystems. While the overall time scale of non-sustainable forest exploitation in Europe extends over more than a millenium, spatial scales of interference are smaller and of a more individual nature, depending on local or regional traditions and preferences in land-use.

Many forest practitioners expected a higher stability of Norway spruce against windthrow when spruce grows in mixed stands. However, in the analyses of damage after the heavy 1990 storms, no consistent pattern of such kind could be found (Lupke and Spell mann, 1997). Nevertheless, under heavy storms the physically more stable tree species will survive with a higher probability, so the spatial extent of damage will be limited, and regeneration of the stand will lie facilitated. A higher resilience of the forest can also be expected regarding insect damages, which normally selectively hit one tree species.

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Séminaire Pierre Lelong Année 1967-1968 by P. Lelong

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