Missing growth rings and live crown characteristics in Pinus nigra Arn. ssp. laricio (Poir.) Maire

Meredieu, C.; Caraglio, Y.

Canadian Journal of Botany 76(12): 2051-2060


ISSN/ISBN: 0008-4026
Accession: 003202479

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During a study of the live crown characteristics of Pinus nigra subsp. laricio in the Centre region (a plateau zone) of the state forest of Orleans in France, the observation of branch cross-sections allowed a histological study of the problem of the discontinuance of cambial activity, which leads to missing rings. The generality of the phenomenon was established for this species. In addition to observations at the base of living branches, cross-sections in successive growth units of the branch were observed in order to establish the distribution of the annual wood layers along the branch and to ascertain the dissymmetry between the upper and lower sides of the branch. The occurrence of the phenomenon in the upper part of the crown raises the problem of the contribution of these branches to tree development and its implication in forest management.