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Comparative study of hybrid and wild black poplar genotypes in the first three-year cycle of multi-stem short-rotation coppice

Saulino Luigi, Allevato Emilia, Todaro Luigi, Rossi Sergio, Bonanomi Giuliano et Saracino Antonio. (2019). Comparative study of hybrid and wild black poplar genotypes in the first three-year cycle of multi-stem short-rotation coppice. Biomass and Bioenergy, 122, p. 17-27.

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URL officielle: http://dx.doi.org/doi:10.1016/j.biombioe.2019.01.0...

Résumé

In short-rotation coppice, shoots grow at high density and compete for limiting resources with their neighbours. Interactions among shoots translate into individual size differences due to resource apportionment. In the present study we compared shoot dynamics of six hybrid poplars and three wild river genotypes of Populus nigra under the first three-year cycle of multi-stem short-rotation coppice. We investigated changes over time in diameter frequency distribution, mortality and biomass partitioning according to crown classes of the shoots. Unimodal shoot diameter distributions during rotation modelled by a two-parameter Weibull probability density distribution show that the values of the α scale parameter are higher in hybrid genotypes compared to wild black poplars (α ≥ 2.0 and α ≤ 2.0, respectively) in all three years. The values of the β shape parameter mostly decrease over time in hybrid genotypes and increase in wild black poplars in the narrow range from 1.42 to 2.38 and from 1.47 to 2.03, respectively. With regard to biomass partitioning among shoot crown classes, differences in size attributes are more pronounced in hybrids than native black poplar genotypes. In hybrid genotypes, 83.7% of the biomass is allocated to dominant shoots, while wild black poplars share 71.6% of the biomass in the dominant and 24.8% in the intermediate shoots. This disproportional biomass allocation among crown classes of hybrid compared to native genotypes could be related to their different origin of selection.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:09619534
Volume:122
Pages:p. 17-27
Version évaluée par les pairs:Oui
Date:2019
Identifiant unique:10.1016/j.biombioe.2019.01.001
Sujets:Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Unités de recherche > Centre de recherche sur la Boréalie (CREB)
Mots-clés:biomass partitioning, european black poplar, hybrid poplar clones, short-rotation coppice, tree size attributes, weibull PDF
Déposé le:01 juin 2023 15:11
Dernière modification:01 juin 2023 15:11
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