Factors toxic to beech (Fagus sylvatica L.) seedlings in acid soils |
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Authors: | Martin Ljungström Ingrid Stjernquist |
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Affiliation: | 1. Department of Ecology, University of Lund, Helgonav?gen 5, S-223 62, Lund, Sweden
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Abstract: | The effects of highly and moderately acid soils on total biomass, biomass partitioning, fine root characteristics and nutritional status of beech seedlings (Fagus sylvatica L.) were studied in a growth chamber experiment. In Haplic Arenosols seedlings grew slowly but equally well without damage symptoms in a highly acid and a moderately acid soil horizon. The moderately acid Ah+Bw-horizon of a Eutric Cambisol was favourable to seedling growth. The fine root development was reduced in the highly acid A+Bw-horizon of a Dystric Cambisol and in the Ah+E-horizon of a Haplic Podzol, the latter of which also caused increased mortality. Seedling growth in the B2-horizon of the Haplic Podzol was vigorous, in spite of a higher level of extractable Al and lower base saturation as compared with the Ah+E-horizon. These results are interpreted in relation to soil acidity, soil Al and nutritional status of the seedlings. We conclude that neither Al-toxicity nor nutrient deficiency cause the damage symptoms observed in the Ah+E-horizon of a Haplic Podzol and the fine root reduction in the A+Bw-horizon of a Dystric Cambisol. The damage symptoms of the PZhA treatment seems to be more the result of H-toxicity or H-related factors other than nutrient shortage or Al-toxicity. Other pH-related toxic factors are discussed. |
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Keywords: | acidity aluminium beech biomass Fagus sylvatica L. H pH nutrient podzol regeneration roots seedlings soil toxicity |
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