tailieunhanh - Báo cáo lâm nghiệp: "Effect of leaf biomass and phenological structure of the canopy on plot growth in a deciduous hardwood forest in northern Japan"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Effect of leaf biomass and phenological structure of the canopy on plot growth in a deciduous hardwood forest in northern Japan. | Ann. For. Sci. 63 2006 725-732 INRA EDP Sciences 2006 DOI forest 200653 725 Original article Effect of leaf biomass and phenological structure of the canopy on plot growth in a deciduous hardwood forest in northern Japan Mika TAKIYAa Kiyoshi UMEKIb Kihachiro KlKUZAWAc Yasutomo HlGASHIURAd a Hokkaido Forestry Research Institute Doto Branch Station Nishi2 Shintoku Hokkaido 081-0038 Japan b Graduate School of Science and Technology Chiba University Matsudo 648 Matsudo Chiba 271-8510 Japan c Ishikawa Prefectural University Nonoichi Ishikawa 921-8836 Japan d School of Life Science Tokyo University of Pharmacy and Life Science Hachiohji Tokyo 192-0392 Japan Received 6 February 2006 accepted 15 June 2006 Abstract - We monitored leaf biomass seasonal changes in leaffall and plot growth for 11 years post-thinning in a secondary deciduous hardwood stand dominated by Betula maximowicziana Regel in central Hokkaido Japan. Annual leaf biomass was divided into two phenological amounts leaves that fell from May to September early foliage and leaves that fell from October to November late foliage . Annual leaf biomass and the ratio of late foliage to annual leaf biomass changed with stand development thinning and insect outbreaks. Multiple regression analysis revealed that the gross growth rate was positively dependent on both early and late foliage whereas the effect of early foliage was stronger than that of late foliage. This result indicates that plot growth was determined by not only total leaf biomass but also the phenological structure of the canopy. In assessing and controlling forest productivity the phenological structure of the canopy should be considered. disturbance herbivorous insects leaf biomass plot growth thinning Résumé - Effet de la biomasse foliaire et de la structure phénologique de la canopée sur la croissance d un peuplement feuillu décidu dans le nord du Japon. Nous avons contrôlé la biomasse foliaire les changements saisonniers des chutes de .

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