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• W2181762449 abstract "The sensitivity of altitudinal and latitudinal tree-line ecotones to climate change, particularly that of temperature, has received much attention. To model the possible effects of climate change and improve our understanding of the factors affecting treeline position and movements, we used the spatially-explicit dynamic forest model TreeMig. Although well-suited because of its landscape dynamics functions, TreeMig features a parabolic temperature growth response curve, which has recently been questioned, and the species parameters are not specifically calibrated for cold temperatures. Our main goals were to improve the theoretical basis of the temperature growth response curve in the model and to develop a method for deriving that curve’s parameters from tree-ring data. We replaced the parabola with an asymptotic curve, calibrating this for the main species at the subalpine (Swiss Alps: Pinus cembra, Larix decidua, Picea abies) and boreal (Fennoscandia: Pinus sylvestris, Betula pubescens, Picea abies) tree-lines. After adjustment of its parameters, the new growth curve fitted the field measurements (tree-ring widths) better. For the subalpine species, the minimum degree-day sum was lowered by around 100 degree-days; in the case of Larix, the maximum ring-width was increased to 5.19 mm. At the boreal tree-line, the minimum degree-day sum for Pinus sylvestris was lowered by 210 degree-days and its maximum ring-width increased to 2.943 mm; for Betula (new in the model) the minimum heat sum was set to 325 degreedays and the maximum ring-width to 2.51 mm; the values from the only boreal sample site for Picea were similar to the subalpine ones, so the same parameters were used. However, adjusting the growth response alone did not improve the model’s output concerning species’ distributions and their relative importance at tree-line. Minimum winter temperature, which controls seedling establishment in the model, proved more important for determining distribution. Picea, P. sylvestris and Betula did not have minimum winter temperature limits, so these values were set to -7, -11 and -13 respectively. In a case study for the Alps, the original and newly-calibrated versions of TreeMig were compared with data from the National Forest Inventory (NFI). Both models gave similar, reasonably realistic results." @default.
• W2181762449 created "2016-06-24" @default.
• W2181762449 creator A5028371789 @default.
• W2181762449 date "2006-01-01" @default.
• W2181762449 modified "2023-09-26" @default.
• W2181762449 title "MODELLING TREE POPULATION DYNAMICS AT THE ALPINE AND BOREAL TREE-LINE ECOTONES IN RESPONSE TO CLIMATE AND LAND-USE CHANGE" @default.
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