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Báo cáo lâm nghiệp: " Pointer years and growth in Turkey oak (Quercus cerris L) in Latium (central Italy). A dendroclimatic approach"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: " Pointer years and growth in Turkey oak (Quercus cerris L) in Latium (central Italy). A dendroclimatic approach. | Ann Sci For 1996 53 671 -684 Elsevier INRA 671 Original article Pointer years and growth in Turkey oak Quercus cerris L in Latium central Italy . A dendroclimatic approach M Romagnoli G Codipietro Dipartimento di Scienze dell Ambiente Forestale e delle sue Risorse Universitá della Tuscia 01100 Viterbo Italy Received 2 November 1994 accepted 1 November 1995 Summary A dendrochronological and a dendroclimatological analysis was carried out on samples of Turkey oak from seven sites in Latium. This research was effected in order to investigate what climatic impulse makes the dendrochronological curves of different sites comparable to each other. The Latium region proved particularly suitable for this kind of analysis due to its many orographic climatic and pedologic differences within distances of a few kilometres. Pointer years were checked on the residuals curves and on the raw data taking into account the same growth trend for consecutive years. The dendroclimatic analysis showed that the majority of pointer years are related to spring precipitation and to June temperature. In addition a preliminary approach is reported to define some anatomical features of pointer years. An automatic image analysis system was used to examine anatomical features in pointer years and a new method for histological quantitative representation is proposed. dendroclimatology I Quercus cerris pointer year image analysis Resume Années caractéristiques et accroissement du chêne chevelu Quercus cerris L dans le Latium Italie centrale . Une approche dendroclimatique. Une analyse dendrochronologique et dendroclimatologique a été menée sur quelques échantnions de Quercus cerris prélevés dans sept sites du Latium. L objectif majeur de analyse est d identifier les facteurs climatiques qui rendent comparables entre elles les courbes dendrochronologiques correspondant aux differents sites prospectés. La region prospectée fournit des situations orographiques pédologiques et climatlques variables sur