Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: "Insect damage to cones and other mortality factors limiting natural regeneration potential of Swiss stone pine (Pinus cembra L) in the northern French Alps. | Ann Sci For 1996 53 153-158 Elsevier INRA 153 Short note Insect damage to cones and other mortality factors limiting natural regeneration potential of Swiss stone pine Pinus cembra L in the northern French Alps L Dormont1-2 A Roques 1 L Trosset2 1 station de zoologie torestière CRF-Orléans INRA Ardon 45160 Olivet 2 Laboratoire dynamique des écosystèmes d altitude CISM campus scientifique université de Savoie 73376 Le Bourget-du-Lac cedex France Received 21 November 1994 accepted 13 March 1995 Summary A seed cone population of Swiss stone pine was surveyed from flower bud burst to cone maturation during 1992-1993. The potential seed crop was estimated to decrease by 84 of the initial value. Mortality was mainly caused by abiotic factors during the first year of cone development while cone insects caused most damage to second-year cones. The cone entomofauna only included three phytophagous species and largely differed from the fauna observed in cones of other Alpine conifers. Pinus cembra I regeneration cone insect I seed loss Resume Les dégats d insectes des cones et autres facteurs de mortalité limitant les poten-tialités de regeneration naturelie du pin cembro dans les Alpes franpaises du Nord. Un suivi démo-graphique de cones de pin cembro sur un cycle reproductif complet a été realise en 1992 et 1993. Au total 84 de la production potentielle de graines a été détruite. La majorite des pertes a été causée par des facteurs abiotiques la premiere année et par des insectes pour les cônes de deuxième année. L entomofaune ne comprendque trois espèces phytophages et differe largement de celle obsen ée dans les autres essences des coniferes alpins. Pinus cembra regeneration insecte des cones perte en graines 154 L Dormont et al INTRODUCTION Insects exploiting seed cones are known to limit the potential of natural regeneration in high altitude conifer forests. In larch such insects may currently reduce the annual number of seeds by 50 to 80 in the French Alps and even by
