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  • 1. Berlin, Mats
    et al.
    Persson, Torgny
    Jansson, Gunnar
    Haapanen, Matti
    Ruotsalainen, Seppo
    Bärring, Lars
    SMHI, Research Department, Climate research - Rossby Centre.
    Gull, Bengt Andersson
    Scots pine transfer effect models for growth and survival in Sweden and Finland2016In: Silva Fennica, ISSN 0037-5330, E-ISSN 2242-4075, Vol. 50, no 3, article id 1562Article in journal (Refereed)
    Abstract [en]

    In this study, we developed models of transfer effects for growth and survival of Scots pine (Pinus sylvestris L.) in Sweden and Finland using a general linear mixed-model approach. For model development, we used 378 provenance and progeny trials with a total of 276 unimproved genetic entries (provenances and stand seed check-lots) distributed over a wide variety of climatic conditions in both countries. In addition, we used 119 progeny trials with 3921 selected genetic entries (open-and control pollinated plus-tree families) for testing model performance. As explanatory variables, both climatic indices derived from high-resolution gridded climate datasets and geographical variables were used. For transfer, latitude (photoperiod) and, for describing the site, temperature sum were found to be main drivers for both survival and growth. In addition, interaction terms (between transfer in latitude and site altitude for survival, and transfer in latitude and temperature sum for growth) entail changed reaction patterns of the models depending on climatic conditions of the growing site. The new models behave in a way that corresponds well to previous studies and recommendations for both countries. The model performance was tested using selected plus-trees from open and control pollinated progeny tests. Results imply that the models are valid for both countries and perform well also for genetically improved material. These models are the first step in developing common deployment recommendations for genetically improved forest regeneration material in both Sweden and Finland.

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