Journal
AGRICULTURAL AND FOREST METEOROLOGY
Volume 315, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.agrformet.2021.108788
Keywords
Tree ring; Sap flow; Dendrometer; Stem radius variations; Tree water deficit; Climate-growth correlation
Categories
Funding
- Austrian Federal Ministry of Science, Research and Economy
- Autonomous Province of Bozen/Bolzano
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High elevation mountain forests in the European Alps are experiencing significant effects from climate change. European larch shows a stronger response to temperature and has experienced greater increases in tree ring width compared to Swiss stone pine. Short-term impacts include reduced sap flow in Swiss stone pine due to low soil moisture, and reduced radial stem growth due to air vapor pressure deficit, resulting in lower annual growth compared to larch. These findings suggest that larch may benefit from climate change at the expense of Swiss stone pine.
High elevation mountain forests in the European Alps are strongly affected by climate change. In this study we aimed to investigate the long- and short-term effects of climate on radial stem growth and tree hydraulics of the two dominant tree species at the forest line of the Eastern central Alps, European larch (Larix decidua Mill. and Swiss stone pine (Pinus cembra L). To this end, we analyzed tree ring widths from stem cores from five sites between 1990 and 2320 m above sea level (a.s.l.) and measured sap flow for three years and radial stem variation for four years at three sites between 1990 and 2100 m a.s.l. in an inner alpine dry valley in Northern Italy. We found that tree ring width of larch responded stronger to temperature and increased more with warming in the last decades than in Swiss stone pine. In the short term, low soil moisture reduced sap flow during the summer in Swiss stone pine but not in larch. Additionally, air vapor pressure deficit clearly reduced the number of days with radial stem growth in Swiss stone pine, leading to lower annual growth than in larch. Consequently, larch at high elevation might actually benefit from climate change at the expense of Swiss stone pine.
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