Roman Zweifel results 17
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Recent findings suggest that global warming is altering the timing of trees' phenological activities, including earlier emergence from winter dormancy. While early‐season warming can boost carbon uptake, tree growth does not seem to benefit. The underlying mechanisms and the altered intra‐ and inter‐annual growth dynamics, as well as their interaction with environmental factors, remain poorly understood. We analysed daily‐reso...
Finding balance: Tree‐ring isotopes differentiate between acclimation and stress‐induced imbalance in a long‐term irrigation experimentNARA Subscribed
Scots pine ( Pinus sylvestris L.) is a common European tree species, and understanding its acclimation to the rapidly changing climate through physiological, biochemical or structural adjustments is vital for predicting future growth. We investigated a long‐term irrigation experiment at a naturally dry forest in Switzerland, comparing Scots pine trees that have been continuously irrigated for 17 years ( irrigated ) with those...
The fall of the summer truffle: Recurring hot, dry summers result in declining fruitbody production of Tuber aestivum in Central EuropeNARA Subscribed
Global warming is pushing populations outside their range of physiological tolerance. According to the environmental envelope framework, the most vulnerable populations occur near the climatic edge of their species' distributions. In contrast, populations from the climatic center of the species range should be relatively buffered against climate warming. We tested this latter prediction using a combination of linear mixed effe...
Number of growth days and not length of the growth period determines radial stem growth of temperate treesNARA Subscribed
Radial stem growth dynamics at seasonal resolution are essential to understand how forests respond to climate change. We studied daily radial growth of 160 individuals of seven temperate tree species at 47 sites across Switzerland over 8 years. Growth of all species peaked in the early part of the growth season and commenced shortly before the summer solstice, but with species‐specific seasonal patterns. Day length set a windo...
Driving factors of a vegetation shift from Scots pine to pubescent oak in dry Alpine forestsNARA Subscribed
An increasing number of studies have reported on forest declines and vegetation shifts triggered by drought. In the Swiss Rhone valley (Valais), one of the driest inner‐Alpine regions, the species composition in low elevation forests is changing: The sub‐boreal Scots pine ( Pinus sylvestris L.) dominating the dry forests is showing high mortality rates. Concurrently the sub‐Mediterranean pubescent oak ( Quercus pubescens Willd...
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