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Báo cáo lâm nghiệp: "Investigations on vitality and genetic structure in oak stands"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài:"Investigations on vitality and genetic structure in oak stands. | Ann Sci For 1996 53 761 -773 Elsevier INRA 761 Original article Investigations on vitality and genetic structure in oak stands H Hertel I Zaspel Federal Research Centre for Forestry and Forest Products Institute for Forest Tree Breeding Eberswalder Chaussee 3 15377 Waldsieversdorf Germany Received 3 January 1995 accepted 2 November 1995 Summary Six oak stands with the two indigenous species Quercus petraea and Q robur were investigated in order to establish relationships between the vitality of oak trees and their genetic structure. The stands were affected by the European oak decline . The registered traits of every tree were branching habits defoliation discoloration of foliage necrosis on stems epicormic branches at stems and in the crowns. The several traits were integrated into a vitality coefficient. Isozyme analyses were carried out to characterize the genetic structure of oak stands and subpopulations distinguished by their vitality. In principle the results indicate the same tendency for the relationship between vitality and genetic structure for Q robur and o petraea increase of excess of homozygotes from the tolerant group to the sensitive group decrease of observed heterozygosity from the tolerant to the sensitive group maximum hypothetical gametic diversity and minimum subpopulation differentiation in the intermediate group as an indication for a directed selection. Quercus I vitality I isozyme marker genetic structure selection decline Resume Recherches sur la vitalité et la structure génétique de peuplements de chênes. Six peuplements comportant les deux espèces indigenes Quercus petraea et Q robur out été analyses dans le but de relier la vitalité des arbres à leur structure génétique. Les peuplements en question souffraient de dépérissement marqué. Les caractères notes sur chaque individu étaient la branchaison le degré de defoliation les decolorations du feuillage I existence de necroses sur les troncs et la presence de rameaux anticipés sur les .