tailieunhanh - Báo cáo lâm nghiệp: "arbon and nutrient stocks in mature Quercus robur L. stands in NW Spai"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Carbon and nutrient stocks in mature Quercus robur L. stands in NW Spain. | Ann. For. Sci. 63 2006 557-565 INRA EDP Sciences 2006 DOI forest 2006038 557 Original article Carbon and nutrient stocks in mature Quercus robur L. stands in NW Spain Miguel A. Balboa-Murias Alberto ROJO Juan G. ÁLVAREZ Agustín MERINO Faculty of Forestry Escuela Politécnica Superior University of Santiago de Compostela Campus Universitario s n 27002 Lugo Spain Received 3 March 2005 accepted 25 January 2006 Abstract - In the present study the distribution of C and nutrients in biomass above- and below-ground and soil were estimated in native Quercus robur stands in NW Spain. This information can be used to design future strategies to preserve and improve these forests which are subjected to severe degradation as a consequence of poor management and fire damage. Biomass equations for tree components were fitted simultaneously using the data corresponding to 31 trees felled in 4 representative mature stands. The C accumulated in aerial biomass roots litter layer and mineral soil made up 40 10 8 and 42 respectively of the C in the whole forest system. Tree biomass contained higher amounts of macronutrients than the available reserves in the soil. Stem wood was the major tree compartment for most nutrients with the exception of Ca which was mainly accumulated in stem bark. In comparison with commercial forest plantations in the region particularly high amounts of nutrients were accumulated in the litter layer because of the high amounts of litterfall and higher foliar concentrations of nutrients. Quercus robur L. biomass forest nutrition carbon seemingly unrelated regression Résumé - Estimation des stocks de carbone et d éléments minéraux dans des peuplements matures de Quercus robur L. du NO de l Es-pagne. Dans la présente étude une estimation de la distribution du Carbone et des éléments minéraux dans de la biomasse aérienne et souterraine et le sol des forêts primaires de Quercus robur du NO de l Espagne est faite. Cette information pourra être utilisée pour