TAILIEUCHUNG - Báo cáo khoa học: "Effects of sylvicultural practices on nutrient status in a Pinus radiata plantation: Nutrient export by tree removal and nutrient dynamics in decomposing logging residues"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Effects of sylvicultural practices on nutrient status in a Pinus radiata plantation: Nutrient export by tree removal and nutrient dynamics in decomposing logging residues. | Ann. For. Sci. 58 2001 411-422 INRA EDP Sciences 2001 411 Original article Effects of sylvicultural practices on nutrient status in a Pinus radiata plantation Nutrient export by tree removal and nutrient dynamics in decomposing logging residues Guzmán Ouro Pilar Pérez-Batallón and Agustín Merino Department of Soil Science and Agricultural Chemistry Escuela Politécnica Superior Universidad de Santiago de Compostela 27002 Lugo Spain Received 9 May 2000 accepted 11 September 2000 Abstract - The effects of logging residue management practices on export and dynamics of nutrients were studied in a plantation of Pi-nus radiata D. Don growing on an infertile soil in a humid temperate area of NW Spain. The export of nutrients due to the removal of wood and logging residues during thinning and clear-cutting was evaluated by estimation of nutrient stores in the above-ground biomass and in the soil. Nutrient dynamics in decomposing slash needles and twigs were monitored over one year in a thinned stand and in an adjacent clear-cut area. Comparison of nutrient release in decaying residues with the nutrient store in tree biomass as well as inputs via litterfall and atmosphere allowed discussion of possible implications for sustainable sylviculture in these plantations. Nutrient release from decomposing material increased following clear-cutting and to an even greater extent after mechanical incorporation of logging residues to the mineral soil which substantially increased the short-term flush of some nutrients. logging residues decomposition tree harvesting thinning forest nutrient cycling Résumé - Effets des pratiques forestières sur la nutrition d un peuplement de Pinus radiata exportation des éléments minéraux et dynamique des résidus en décomposition. Les effets de l utilisation desrésidus d exploitations forestieres sur l exportation et la dy-namique des éléments minéraux ont été étudiés dans une plantation de Pinus radiata D. Don située sur une station non fertile et dans

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