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Effects of ectomycorrhizal inoculants on survival and growth of interior Douglas-fir seedlings on reforestation sites and partially rehabilitated landings

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We studied the effects of commercially available (Laccaria laccata (Scop.:Fr.) Berk. & Br. and Rhizopogon parksii Smith (Oregon source)) and native (R. parksii (British Columbia source)) ectomycorrhizal (EM) inoculants on the survival and growth of commercially grown interior Douglas-fir (Pseudotsuga menziesii var. glauca (Beissn.) Franco) seedlings outplanted on reforestation sites (burned piles and clearcuts) and partially rehabilitated (shallow- and deep-tilled to a depth of 15 and 50 cm, respectively) landings. We also examined the physical and chemical properties of the soil and the EM status and foliar element levels of noninoculated Douglas-fir seedlings to provide information on the growing conditions found on these types of sites. Inoculation treatments did not significantly increase survival and growth of Douglas-fir seedlings 2 years after outplanting. However, because the average percent EM colonization of inoculated seedlings at time of outplanting was low (36%), the beneficial effects of these inoculants may not have been attained. It is possible that nursery conditions partially account for the low EM colonization of inoculated seedlings. We therefore suggest that nurseries try to modify growing conditions to favor good EM formation before outplanting interior Douglas-fir. Benefits of inoculations on landings may have been restricted by the poor soil conditions, potentially toxic levels of Fe and Al, and competition from well-adapted native EM fungi.

Nous avons étudié les effets de deux champignons ectomycorhiziens (CEM) disponibles commercialement (Laccaria laccata (Scop.:Fr.) Berk. & Br. and Rhizopogon parksii Smith (souche provenant de l'Oregon)) et d'une souche indigène (Colombie-Britanique)de R. parksii sur la survive et la croissance de semis de Douglas bleu (Pseudotsuga menziesii var. glauca (Beissn.) Franco) transplantés sur des sites forestiers dégradés (piles brûlées et coupes à blanc) et des jetées partiellement réhabilitées par un labourage à des profondeurs de 15 et 50 cm. De plus, pour décrire les conditions de croissance sur ces sites, nous avons examiné les propriétés physiques et chimiques du sol, le statut ectomycorhizien et le contenu en éléments des aiguilles des semis de Douglas bleu non inoculés. Après 2 ans, les inoculants n'avaient pas augmenté significativement la survie et la croissance des semis de Douglas bleu. Cependant, avant la transplantation, les semis avaient un faible taux de colonisation (36 %) par les ectomycorhizes et, par conséquent, leurs effets bénéfiques ne se sont probablement pas entièrement fait sentir. Il est possible que les conditions de culture de semis en pépinière soient partiellement responsables pour ce faible taux de colonisation. Nous suggérons donc que les pépinières intéressées à augmenter le taux de colonisation des CEM modifient les conditions de culture des semis de Douglas bleu. Finalement, les effets bénéfiques des inoculants sur les jetées ont probablement été limités par la pauvreté du sol, les concentrations potentiellement toxiques en Fe et en Al dans les aiguilles et la compétition avec d'autres CEM indigènes mieux adaptés.

Document Type: Research Article

Publication date: 2004-10-01

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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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