tailieunhanh - Báo cáo lâm nghiệp: "Predicting solar radiation transmittance in the understory of even-aged coniferous stands in temperate forests"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Predicting solar radiation transmittance in the understory of even-aged coniferous stands in temperate forests. | Ann. For. Sci. 61 2004 629-641 INRA EDP Sciences 2004 DOI forest 2004061 629 Original article Predicting solar radiation transmittance in the understory of even-aged coniferous stands in temperate forests Gabriela SONOHATa Philippe BALANDiERa Felix RUCHAUDa b a Cemagref Clermont-Ferrand Regional Centre Team of Applied Ecology of Woodlands 24 av. des Landais BP 50085 63172 Aubière Cedex France b Present address ONF Agence départementale de l Allier Les Portes d Arvernes rue de la République BP 1722 03017 Moulins Cedex France Received 30 January 2003 accepted 3 September 2003 Abstract - The amount of transmitted light in the understories of forest stands affects many variables such as biomass and diversity of the vegetation tree regeneration and plant morphogenesis. Therefore its prediction according to main tree or stand characteristics without the need for difficult and costly light measurements would be most useful for many different users and scientists. Transmitted global solar radiation was measured using tube solarimeters in the understories of 204 plots of even-aged coniferous stands of four species Pseudotsuga menziesii Picea abies Larix sp. and Pinus sylvestris in a wide range of ecological and management conditions in the temperate climate zone. From these data a range of simple models based on the Beer-Lambert law was built and fitted to predict mean stand radiation transmittance from basic stand traits and management features stand basal area stand age time since last thinning and last thinning intensity. Forest managers can use it to predict understory light availability and adapt their silviculture to various objectives. coniferous forest solar radiation model basal area stand management Résumé - Simulation de l eclairement relatif dans le sous-bois de peuplements réguliers de coniferes en forêts tempérées. La quantité de lumière disponible dans le sous-bois des forêts affecte de nombreux processus tels que la production de biomasse et la .