tailieunhanh - Báo cáo lâm nghiệp: "Unexpected disproportion observed in species composition between oak mixed stands and their progeny populations"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Unexpected disproportion observed in species composition between oak mixed stands and their progeny populations. | Ann. For. Sci. 64 2007 413-418 INRA EDP Sciences 2007 DOI forest 2007018 Available online at Original article Unexpected disproportion observed in species composition between oak mixed stands and their progeny populations Monika DERING Andrzej Lewandowski Institute of Dendrology Polish Academy of Sciences Parkowa 5 62-035 Kórnik Poland Received 27 April 2006 accepted 30 October 2006 Abstract - We used morphological analysis to assess species composition of natural regenerations and progeny plantations established from two mixed oak stands in Jamy and Legnica Poland. Despite equal proportions of pedunculate Quercus robur and sessile oak Quercus petrea in seed stands the species composition differed strikingly. In all progeny populations pedunculate oak dominated reaching and in Legnica and Jamy respectively. However sessile oak predominated in natural regenerations. Morphological studies indicated a varied number of phenotypically intermediate or mosaic individuals. Among artificial populations the highest number of putative hybrids was observed in Legnica average and the lowest in Jamy average . Hybrids in natural regeneration were 1 in Legnica and 8 in Jamy. The disproportionate species composition could result from either unintentional indirect acorn selection during collection or selection in nursery practice. We discuss the role of ecophysiological differences between species in biased species representation in progeny populations. Q. robur Q. petrea mixed stand progeny plantation hybridization Résumé - Disproportion inattendue dans la composition specifique observée entre des peuplements melanges de chêne et leurs descendances. Nous avons utilisé des analyses de caractères morphologiques pour déterminer la composition spécifique dans des régénérations naturelles et dans des plantations de chêne issues de deux peuplements mélangés à Jamy et Legnica Pologne. Malgré des proportions égales entre chêne pé-donculé .