TAILIEUCHUNG - Báo cáo khoa học: "Impact of tree species on soil solutions in acidic conditions"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Impact of tree species on soil solutions in acidic conditions. | 47 Ann. For. Sci. 58 2001 47-58 INRA EDP Sciences 2001 Original article Impact of tree species on soil solutions in acidic conditions Laurent Augusto and Jacques Ranger Institut National de la Recherche Agronomique Centre de Recherches Forestieres de Nancy Équipe Cycles Biogéochimiques 54280 Champenoux France Received 1st September 1999 accepted 5 June 2000 Abstract - Capillary solutions of two acidic forest topsoils were sampled for one year. On each of the two soils there were three stands Norway spruce Douglas fir Hardwood . Capillary solutions were extracted using the centrifugation method. Soil moisture under Hardwood stands was higher than under coniferous stands. Soil solutions under the coniferous tree species were more acidic and more concentrated in SO4-2-S and Na than under Hardwoods showing that coniferous tree species intercept atmospheric depositions more efficiently than hardwood tree species do. Soil solutions under hardwood stands were more concentrated in K Alt Si and Fe1 3 than those under coniferous stands. On the least desaturated site soil solutions under the hardwood stand were less concentrated in NO3--N and C than under the coniferous stands. The amount of rainfall significantly influenced results by diluting soil solutions. When the amount of rainfall was high there were little difference between tree species. forest soil tree species soil solution centrifugation acidity Résumé - Impact des essences forestieres sur la composition des solutions du sol en conditions acides. Les solutions capillaires des horizons superficiels de deux sols forestiers acides ont été échantillonnées pendant une année. Sur chaque sol trois peuplements étaient présents Epicéa commun Sapin Douglas Feuillu . Les solutions capillaires ont été extraites des sols par centrifugation. L humidité des sols sous feuillu est supérieure à celle sous résineux. Les solutions de sol sous résineux sont plus acides et plus concentrées en S-SO4-2 et en Na ce qui témoigne d une plus

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