tailieunhanh - Báo cáo khoa học: "Silviculture of high-quality oaks: questions and future research needs"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Silviculture of high-quality oaks: questions and future research needs. | Ann Sci For 1993 50 531-534 Elsevier INRA 531 Original article Silviculture of high-quality oaks questions and future research needs GT Weaver1 H Spiecker2 1 Department of Forestry Wildlife and Fisheries The University of Tennessee PO Box 1071 Knoxville TN 37901-1071 USA 2 Institut fur Waldwachstum Bertoldstr 17 DW-7800 Freiburg Germany Received 6 January 1993 accepted 2 June 1993 Summary Oak forests are economically and ecologically important in Central Europe and eastern United States of America. In the former oak forests are being returned by artificial regeneration to many sites where oaks had been replaced by other species. Artificial and natural regeneration methods are being sought. Coppice forests are being replaced by forests of seed origin on many sites throughout Central Europe. Methods using wider spacing and shorter rotations which produce high-quality timber adapted to site quality are being considered. In the USA reliable regeneration remains a key silvicultural problem. Effective means of both artificial and natural regeneration are being sought. Oak forest are and will be managed for a broader range of objectives in Central Europe and the USA. Future research .needs include ecophysiology growth and development regeneration silvicultural systems and oak decline. Quercus spp silviculture I ecology coppice high forest Central Europe USA Résumé Sylviculture des chênes de haute qualité. Questions et besoins en recherches futures. Les forets de chênes sont économiquement et écologiquement importantes en Europe et dans I est des États-Unis d Amerique. Dans le premier cas les chênaies sont revenues grace à la regeneration artificielle sur de nombreux sites où elles avaient été remplacées par d autres espèces. Des methodes pour la regeneration naturelie et artificielle sont recherchées. Les taillis sont rempla-CÓS par des futaies dans beaucoup d endroits en Europe. Les methodes utilisant de larges espacements et des rotations courtes qui produisent des bois