| Autor: |
M. Konnert, E. Hussendörfer |
| Rok vydání: |
2001 |
| Předmět: |
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| Zdroj: |
Genetic Response of Forest Systems to Changing Environmental Conditions ISBN: 9789048159284 |
| DOI: |
10.1007/978-94-015-9839-2_25 |
| Popis: |
In order to elucidate the effects of management systems on the existing potential of biodiversity the genetic variation of silver fir (Abies alba) in unevenaged forests (“Plenter” forests) and evenaged forests (Altersklassenwald) was investigated by means of isozyme gene-markers at 14 to 16 gene loci. In total about 3300 adult silver firs in 9 “Plenter” forests and 16 evenaged forests in Switzerland, Baden-Wurttemberg (Germany) and Bavaria (Germany) were examined. In two of the “Plenter” forests complete inventories of all fir trees were carried out; in the other stands a partial sampling was performed. In four stands also individuals from the natural regeneration were studied genetically.The genetic diversity and heterozygosity was, with only few exceptions, lower in the unevenaged forests than in the evenaged forests. Possible reasons for these results are the uniform adaptive processes under the comparatively homogeneous site conditions of the “Plenter” forests caused by almost continuous shading effects in time and space. According to this hypothesis, silver firs of “Plenter” forests can be regarded to be well adapted to specific environmental conditions of this forest type. However the genetic adaptability of silver fir in unevenaged forests seems to be lower as in evenaged forests. In respect to the genetic multiplicity, diversity and heterozygosity there was little difference between the natural regeneration and the adult trees in the “Plenter” forest as well as in the evenaged forest. However, significant differences in genetic structures were found in “Plenter” forests at some gene loci. These findings are supposed to be mainly dependent on particularities of the reproduction system and adaptive processes in this stands. The consequences of these results are discussed in respect to genetically sustainable forest management practices. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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