Survival of artificially regenerated Scots pine on till soils with respect to varying dielectric properties

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Abstract:

Artificial regeneration to Scots pine (Pinus sylvestris L.) has faced substantial economical losses in Finnish Lapland on sites underlain by glacial tills and formerly covered by stands dominated by Norway spruce (Picea abies (L.) Karst.). We studied the survival of pine seedlings and saplings with respect to soil dielectric permittivity (epsilon), as dependent on soil water content (thetav), of ploughed tills. The epsilon values (thetav) were determined beneath 10 500 pines varying in age between 2 and 41 years and growing on 21 sites, 500 per site. Based on the logistic regression models, the survival rate of 2- to 7-year-old seedlings was independent of the soil epsilon (i.e., thetav). In contrast, a significant correlation between the survival rate of 12- to 16-year-old saplings and soil epsilon was observed. In this age-class, a survival rate of 50% with epsilon50 = 15.1, with epsilon50 = 17.0 for planted saplings and epsilon50 = 12.7 for sowed saplings, were obtained. Of the 2000 pine trees aged between 20 and 41 years, 96.5% were observed to be growing on dry tills with epsilon < 15 with mean epsilon = 9.9. The results of this study suggest that artificial regeneration of Scots pine in Lapland is risky on moist and wet tills (epsilon > 15, thetav > 0.27 cm3·cm–3).

La régénération artificielle de pin sylvestre (Pinus sylvestris L.) a subi d'importantes pertes économiques en Laponie finlandaise sur des tills glaciaires occupés antérieurement par des peuplements dominés par l'épicéa commun (Picea abies (L.) Karst.). Nous avons étudié la survie des semis et des gaules de pin sur des tills labourés en fonction de la permittivité diélectrique du sol (epsilon), qui dépend du contenu en eau du sol (thetav). La valeur de epsilon (thetav) a été mesurée sous 10 500 pins dans 21 stations à raison de 500 pins par station. L'âge des arbres variait de 2 à 41 ans. Sur la base de modèles de régression logistique, le taux de survie des semis âgés de 2 à 7 ans est indépendant de la valeur de epsilon dans le sol (i.e. thetav). Par contre, il y a une corrélation significative entre le taux de survie des gaules âgées de 12 à 16 ans et la valeur de epsilon dans le sol. Dans cette classe d'âge, nous avons obtenu un taux de survie de 50% avec une valeur de epsilon50 = 15,1, soit epsilon50 = 17,0 pour les semis plantés et epsilon50 = 12,7 pour les semis ensemencés. Des 2000 pins âgés de 20 à 41 ans, 96,5% croissaient sur des tills secs où la valeur de epsilon était <15 avec une moyenne de 9,9. Les résultats de cette étude indiquent que la régénération artificielle de pin sylvestre en Laponie est à risque sur des tills humides et mouillés (epsilon > 15, thetav > 0,27 cm3·cm–3). [Traduit par la Rédaction]

Document Type: Research Article

Publication date: July 1, 2002

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