Ectomycorrhizal communities within beech (<Emphasis Type="Italic">Fagus sylvatica</Emphasis> L.) forests that naturally regenerate from clear-cutting in northern Spain |
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| Authors: | Nieves Goicoechea Iván Closa Ana María de Miguel |
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| Institution: | (1) Departamento de Biología Vegetal, sección Biología Vegetal (Unidad Asociada al CSIC, EEAD, Zaragoza), Facultades de Ciencias y Farmacia, Universidad de Navarra, c/Irunlarrea 1, 31008 Pamplona, Spain;(2) Departamento de Biología Vegetal, sección Botánica, Facultades de Ciencias y Farmacia, Universidad de Navarra, c/Irunlarrea 1, 31008 Pamplona, Spain |
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| Abstract: | The objectives of the work described here were to evaluate the diversity of ectomycorrhizal (ECM) fungi within Spanish beech
(Fagus sylvatica L.) forests subjected to clear-cutting and natural regeneration and to elucidate the extent to which the carbohydrate concentration
in roots of trees of different ages and sizes is related to ECM colonization. The study concerned an unmanaged forest, a stand
clear-cut in 1996 and another clear-cut in 2001. ECM colonization of beech roots showed seasonal dynamics in the disturbed
areas, but the percentage of roots colonized by ECM was not always related to the accumulation of non-structural carbohydrates.
The composition of ECM communities differed between different stands and 40% of ECM morphotypes only occurred in disturbed
ecosystems. However, comparable numbers of different ECM morphotypes (24, 25) were found in the three beech stands. This finding
indicates that ECM diversity was quite high and similar within disturbed and unmanaged areas. This finding suggests that (1)
ECM diversity was not affected by the size and age of trees and (2) the potential of ECM inocula remained high within clear-cut
areas. Consequently, the introduction of ECM inocula by silvicultural practices would not be needed to improve the regeneration
of clear-cut areas described in our study. |
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| Keywords: | Beech forests Clear-cutting Ectomycorrhizal fungi Non-structural sugars |
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