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Báo cáo khoa học: "Initial mineralization of organic matter in a forest plantation soil following different logging residue management techniques"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Initial mineralization of organic matter in a forest plantation soil following different logging residue management techniques. | Ann. For. Sci. 58 2001 807-818 INRA EDP Sciences 2001 807 Original article Initial mineralization of organic matter in a forest plantation soil following different logging residue management techniques Pilar Pérez-Batallón Guzmán Ouro Felipe Macías and Agustín Merino Department of Soil Science and Agricultural Chemistry Escuela Politécnica Superior Universidad de Santiago 27002 Lugo Spain Received 12 March 2001 accepted 1st June 2001 Abstract - The influence of tree harvesting and site preparation on inorganic N net N mineralization and nitrification microbial biomass and emission of CO2 from soil were evaluated in a field experiment. The study was carried out in a plantation of Pinus radiata D. Three different site preparation techniques were used a whole tree harvesting with removal of logging residues and forest floor b mechanical incorporation of logging residues and forest floor into the upper 20 cm of the mineral soil and c logging residues left on-site. The incorporation of residues into the mineral horizon favoured N immobilization. This effect was accompanied by a higher metabolic activity as indicated by the higher microbial biomass and CO2 emissions as well as the higher N contents in decomposing logging residues. In the plot with residues left on site no changes in soil microbial biomass were observed although there was a high degree of N immobilization. forest soils soil organic matter Pinus radiata microbial biomass carbon nitrogen mineralization nitrate ammonium Résumé - Minéralisation de la matière organique dans le sol d un peuplement forestier après différentes méthodes de gestion des résidus d exploitation forestière. L influence des défrichements et de la preparation du terrain sur l azote inorganique la minéralisa-tion et la nitrification nette de l azote N la biomasse microbienne ainsi que sur l émission du CO2 degagé du sol a été evaluée par une expérience sur le terrain. L étude a été menée pendant 12 mois dans des peuplements de Pinus .