tailieunhanh - Báo cáo lâm nghiệp:"Stand history and its consequences for the present and future dynamic in two silver fir (Abies alba Mill.) stands in the high Pesio Valley (Piedmont, Italy)"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:"Stand history and its consequences for the present and future dynamic in two silver fir (Abies alba Mill.) stands in the high Pesio Valley (Piedmont, Italy)" | Ann. For. Sci. 60 2003 361-370 INRA EDP Sciences 2003 DOI forest 2003027 361 Original article Stand history and its consequences for the present and future dynamic in two silver fir Abies alba Mill. stands in the high Pesio Valley Piedmont Italy Renzo Motta and Fabrizio Garbarino Dep. Agroselviter University of Turin Via Leonardo da Vinci 44 10095 Grugliasco TO Italy Received 6 August 2001 accepted 10 May 2002 Abstract - Two silver fir Abies alba Mill. forest stands have been identified on unmanaged parts of previously managed forests in the Alta Valle Pesio e Tanaro Regional Park Piedmont Italy in order to study their origin past forest dynamic and disturbance history. The historical development and the successional history of these stands were investigated in two plots of 2000 m1 2 by means of the following techniques size and age structure analysis abrupt growth changes analysis establishment of pioneer species and of early-seral shade-intolerant species historical data of logging. The stands investigated are relatively young in the past 70 years some periods of heavy logging have been identified. Intense cutting has caused the establishment of an abundant regeneration of shade intolerant early-seral broadleaves species. The peak recruitment period of the broadleaves occurred around 1940 in plot 1 and around 1975 in plot 2. The current structures and composition of the forest are therefore the result of anthropogenic activity indeed the presence of pure silver fir stands in the past were the result of human intervention. The silver fir will share future dominance with several broadleaves species such as the beech Fagus sylvatica L. and the sycamore Acerpseudoplatanus L. although the exact successional status of these stands is unresolved. stand history forest dynamic dendroecology Abies alba Mill. Alps Résumé - L histoire des peuplements pour outil d aménagement forestier les forêts de sapin blanc Abies alba Mill. dans la Haute Vallée du Pesio CN Italie