tailieunhanh - Báo cáo lâm nghiệp: " The management of snags: A comparison in managed and unmanaged ancient forests of the Southern French Alps"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: " The management of snags: A comparison in managed and unmanaged ancient forests of the Southern French Alps" | Ann. For. Sci. 62 2005 135-142 INRA EDP Sciences 2005 DOI forest 2005005 135 Original article The management of snags A comparison in managed and unmanaged ancient forests of the Southern French Alps Damien MARAGEa b Guy LEMPERIEREc a LERFOB UMR INRA-ENGREF 1092 Unité Ecosystèmes Forestiers et Dynamique du Paysage ENGREF 14 rue Girardet 54042 Nancy Cedex France b Present address UMR Biologie et Gestion des Adventices INRA Dijon Équipe Biodiversité 17 rue Sully 21000 Dijon France c Laboratoire d Écologie Alpine UMR-CNRS 5553 Université Joseph Fourier BP 53 38041 Grenoble Cedex 9 France Received 4 December 2003 accepted 29 September 2004 Abstract - Dead wood is an important structure for conservation purposes and for maintaining biodiversity. In this context snags were studied under different conditions in silver fir ancient forests of the southern French Alps. The impact of management status and developmental phases were estimated on both quantity and quality of this material. SDT volume averaged m1 3-ha-1 and m3-ha-1 in unmanaged and managed ancient forests respectively. SDT volume varied according to the point in the silvicultural cycle and silvigenesis cycle ranging from m3-ha-1 in early aggradation phase of managed forests to m3-ha-1 in degradation phase of unmanaged forest. Large SDT significantly belonged to the degradation phase of unmanaged forests. Our research showed that SDT density in this ancient forests was mainly governed by natural processes. An average of 9 large SDT per ha has been proposed to preserve the ecological processes. Alps ancient forest dead wood ecological persistence silver fir Résumé - Gestion du bois mort sur pied comparaison entre forêts anciennes gérées et subnaturelles des Alpes du Sud francaises. La quantité de bois mort est un enjeu important dans la conservation et le maintien de la biodiversité forestière. Dans ce contexte les bois morts sur pied ont été étudiés dans des .