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Ann. For. Sci.
Volume 58, Number 1, January 2001
Page(s) 47 - 58
DOI: 10.1051/forest:2001102

Ann. For. Sci. 58 (2001) 47-58

Impact of tree species on soil solutions in acidic conditions

Laurent Augusto and Jacques Ranger

Institut National de la Recherche Agronomique, Centre de Recherches Forestières de Nancy, Équipe Cycles Biogéochimiques, 54280 Champenoux, France

(Received 1st September 1999; accepted 5 June 2000)

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 Fe3+ 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.

Impact des essences forestières 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 grande capacité de ces essences à capter les dépôts atmosphériques. Les solutions sous feuillus sont plus concentrées en K+, Alt, Si et Fe3+ que celles sous les résineux. Sur le site le moins désaturé, les solutions sous feuillus sont moins concentrées en N-NO3- et C que celles sous les résineux. La quantité de précipitations influence notablement les résultats en diluant les solutions de sol. Lorsque la pluviosité est très importante, les différences entre essences sont peu marquées.

Key words: forest soil / tree species / soil solution / centrifugation / acidity

Mots clés : sol forestier / essence forestière / solution du sol / centrifugation / acidité

Correspondence and reprints: Jacques Ranger Tel. (33) 03 83 39 40 68; Fax. (33) 03 83 39 40 69;

© INRA, EDP Sciences 2001

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