Тип публикации: статья из журнала
Год издания: 2020
Идентификатор DOI: 10.1007/s13595-020-00958-w
Ключевые слова: climate warming, elevational gradient, larix decidua
Аннотация: Key message The ongoing global warming tends to reduceLarix deciduaradial growth and ring wood density at the bottom of an elevational gradient in the French Alps, while it has a less marked effect at the top. Context The ongoing climate warming affects most tree species across their biogeographic distribution range. The bottom andПоказать полностьюthe top of an elevational gradient are appropriate environments to observe the effect of climate warming in contrasted temperature conditions. Aims To retrospectively study the effect of the ongoing climate warming onLarix deciduatrees located in warm and cold conditions, i.e., at the bottom (1200 m) and the top (2300 m) of an elevational gradient, respectively. Methods Dendroecological analysis of two groups ofLarix deciduatrees located at very low (1200 m) and very high (2300 m) elevations. Construction of climatic response curves for annual ring variables. Decomposition of the variance of the response models into their high and low frequency components. Results At Briancon, in the French Alps, the increase of the daily maximum temperature during the last 50 years is already almost 3 degrees C for the March-October period. The results reveal contrasted behaviors at both ends of the investigated elevational gradient. Basal area increment, ring width, and their earlywood and latewood components increase or level off at the top of the gradient, while they all strongly decrease at the bottom. At the bottom, the low frequency warming effect explains the recent ring width decrease, with no influence of the high frequency temperature variation. At the top, both the low frequency warming effect and the high frequency temperature effect explain each about half of the ring width variation encompassed by the model. Latewood density displays the same trend as ring width, while earlywood density decreases at both ends of the gradient. Conclusion Such opposed trends of the radial growth time trends between the top (2300 m) and the bottom (1200 m) of the gradient reflects the respectively favorable and unfavorable effects of climate warming at such ends of thisLarix deciduaelevational gradient. We propose that the strong ring width decrease observed at the warmer bottom announces a coming dieback. The corresponding wood density decrease will affect wood hydraulic properties in a way that is unclear.
Журнал: ANNALS OF FOREST SCIENCE
Выпуск журнала: Vol. 77, Is. 2
ISSN журнала: 12864560
Место издания: PARIS54
Издатель: SPRINGER FRANCE