Abstract
The influence of forest ageing on fine-root morphology and relations between fine-root and leaf characteristics is poorly studied. The aim of this study was to analyse age-driven changes in ectomycorrhizal roots (EcM roots) and leaf morphology in a chronosequence of silver birch (Betula pendula Roth.), which would provide a better understanding of adaptation responses and acclimation capacity of tree roots and leaves. The chronosequence included six age classes (3, 6, 14, 32, 45, and 60 years.). All stands had regenerated naturally and grew in a highly productive Oxalis forest site type in Estonia. Most changes in the morphology of EcM roots and leaves of silver birch occur faster at a young age. The functional parameters—mean specific area of EcM root (SRA) and leaf specific area (SLA) as well as leaf N—decreased with age. EcM root SRA and specific root length (SRL) decreased with stand age as a result of increased mean diameter and tissue density. In age classes of 6, 14, and 32 years, the total number of dominating EcM taxa was 34, and the distribution of four different dominating EcM exploration types (contact-, short-, medium-, long-distance) was similar. We conclude that high values of SRA, SLA, and leaf N measured in young silver birch stands indicate high activity of physiological processes necessary for fast-growing young trees. A decrease of SLA and SRA and N in the chronosequence of fertile stands of silver birch is most probably caused by down-regulation of growth, affecting simultaneously leaves and fine roots.
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Acknowledgments
This study was supported by Grants No. 7792, 7452, and 7069 of the Estonian Science Foundation, by Target Projects No. SF0180127s08 and SF0180025s12 of the Ministry of Education and Research of the Republic of Estonia and by the EU through the European Regional Development Fund (Centre of Excellence ENVIRON; molecular analyses of EcM fungal species were partly supported by Centre of Excellence FIBIR). We thank Mr. Ilmar Part for linguistic revision of the manuscript.
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Rosenvald, K., Ostonen, I., Uri, V. et al. Tree age effect on fine-root and leaf morphology in a silver birch forest chronosequence. Eur J Forest Res 132, 219–230 (2013). https://doi.org/10.1007/s10342-012-0669-7
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DOI: https://doi.org/10.1007/s10342-012-0669-7