Ilkka Leinonen, Heikki Hänninen, Tapani Repo. (1996). Testing of frost hardiness models for Pinus sylvestris in natural conditions and in elevated temperature. Silva Fennica vol. 30 no. 2–3 article id 5583. https://doi.org/10.14214/sf.a9228

Keywords: Pinus sylvestris; climate change; frost hardiness; Scots pine; temperature; dynamic models; photoperiod; climatic warming

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Two dynamic models predicting the development of frost hardiness of Finnish Scots pine (Pinus sylvestris L.) were tested with frost hardiness data obtained from trees growing in the natural conditions of Finland and from an experiment simulating the predicted climatic warming. The input variables were temperature in the first model, and temperature and night length in the second. The model parameters were fixed on the basis of previous independent studies. The results suggested that the model which included temperature and photoperiod as input variables was more accurate than the model using temperature as the only input variable to predict the development of frost hardiness in different environmental conditions. Further requirements for developing the frost hardiness models are discussed.

Leinonen, E-mail: il@mm.unknown
Hänninen, E-mail: hh@mm.unknown
Repo, E-mail: tr@mm.unknown

Category : Research article

article id 690, category Research article

Bengt Persson. (1998). Will climate change affect the optimal choice of Pinus sylvestris provenances? Silva Fennica vol. 32 no. 2 article id 690. https://doi.org/10.14214/sf.690

Keywords: Pinus sylvestris; yield; survival; temperature sum; climatic warming; provenance transfer

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Provenance experiments with Pinus sylvestris (L.) were evaluated in Sweden north of latitude 60°N. Survival and yield were determined as functions of temperature sum of the site and latitudinal origin of the provenance. Altitudinal origin was of negligible importance. The effects of latitudinal transfer were influenced by temperature sum at the growing site. At the harshest situated sites southward transfer longer than 3° was optimal for survival and yield, whereas transfer effects in a mild climate were weak. Climatic warming would reduce demands of hardiness. However, moderate differences in productivity are expected between formerly optimal seed sources and the ones adapted to changed climatic conditions. Since mortality usually was low in plantations older than 20 years or higher than 2 m, established stands are expected to be robust against adverse effects of climate change.

Persson, Högskolan Dalarna, S-781 88 Borlänge, Sweden E-mail: bpn@du.se

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