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Soil nutrition and temperature as drivers of root suckering in trembling aspen

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In two separate studies, the suckering of trembling aspen (Populus tremuloides Michx.) roots was assessed in response to different daily maximum soil temperatures and in relation to available nutrients (CaSO4 and NH4NO3). In the first study, aspen root sections were incubated under high:low temperature regimes of 12:8, 14:8, 16:8, 18:8, or 20:8°C until 124 degree-days above 8°C had been reached. Daily maximum temperature did not affect the number of suckers produced per square centimetre of root surface area or per root section. However, more time was required to initiate suckers on root sections grown under the 12:8°C temperature regime compared with those grown at 20:8°C. Furthermore, when calculated from a base temperature of 5°C, the number of degree-days needed to initiate aspen suckers was not different across the temperature regimes. In the second study, CaSO4, NH4NO3, or distilled water was added to aspen root sections. While nutrients did not affect the number of suckers produced, the addition of CaSO4 or NH4NO3 significantly increased sucker dry mass. Nutrient addition appeared to stimulate sucker growth and mobilization of stored reserves to support this growth.

Le drageonnement du peuplier faux-tremble (Populus tremuloides Michx.) en réponse à différentes températures quotidiennes maximum du sol et en relation avec les nutriments disponibles (CaSO4 et NH4NO3) a été évalué dans le cadre de deux études distinctes. Dans la première étude, des sections de racine de peuplier ont été incubées sous différents régimes de température maximum : minimum de 12 : 8, 14 : 8, 16 : 8, 18 : 8 ou 20 : 8 °C jusqu'au moment d'atteindre 124 degrés-jours au-dessus de 8 °C. La température maximum durant le jour n'a pas affecté le nombre de drageons produits par centimètre carré de surface racinaire ou par section de racine. Cependant, il fallait plus de temps pour initier la formation des drageons sur les racines conservées au régime de température 12 : 8 °C comparativement au régime 20 : 8 °C. De plus, lorsqu'il était calculé sur la base de 5 °C, le nombre de degrés-jours requis pour initier la formation des drageons était le même quel que soit le régime de température. Dans la seconde étude, CaSO4, NH4NO3 ou de l'eau distillée a été ajouté aux sections de racine de peuplier. Bien que les nutriments n'aient pas affecté le nombre de drageons produits, l'addition de CaSO4 ou de NH4NO3 a significativement augmenté le poids sec des drageons. L'addition de nutriments semble stimuler la croissance des drageons et la mobilisation des réserves pour supporter cette croissance.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: September 1, 2002

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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