tailieunhanh - Báo cáo lâm nghiệp: " A collection of functions to determine annual tree carbon increment via stem-analysis"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: A collection of functions to determine annual tree carbon increment via stem-analysis. | Ann. For. Sci. 61 2004 597-602 597 INRA EDP Sciences 2004 DOI forest 2004055 Note A collection of functions to determine annual tree carbon increment via stem-analysis Marco Bascietto Giuseppe Scarascia-Mugnozza Department of Forest Environment and Resources DISAFRI University of Viterbo Via S. Camillo de Lellis snc 01100 Viterbo Italy Received 19 June 2003 accepted 6 November 2003 Abstract - Stem analysis process is commonly employed in a wide range of applications of forest importance. We developed a program to compute stem increments in terms of volume biomass and carbon storage. The stem-analysis process involves the felling of the tree the extraction of a number of cross-sections from the stem and the measuring of ring-width series on each section. The synchronization of ringwidth series provides a number of tree- and stand-related measures including stem growth pattern diameter at breast height and tree height growth trend site-index assessment timber-quality assessment. Relevant features of the program include i tables and charts can be handled in the R environment or exported to any spreadsheet program ii algorithms are independent from the ring width measuring device iii the computation of stem volume yearly- and mean volume increment is provided as well as the lateral surface area stem carbon pool its yearly-and mean increment and associated measurement errors. Forest biomass destructive surveys can usefully apply stem-analysis techniques in order to assess forest past carbon increment trend and set up the basis for non-destructive future carbon surveys. stem analysis carbon pool annual carbon increment error budget R Résumé - Une compilation de fonctions pour la determination de l increment annuel de carbone à partir de la technique d analyse de tige. La technique d analyse de tige est employée communément pour de larges gammes d applications d intérêt forestier. Nous avons développé un programme pour calculer l accroissement de la tige en terme