Tree Water Deficit Species

Current drought stress of species and regions

The top panel shows the percentage of trees of a species that are in the categories of small water deficit ‘low TWD’ (dark blue), ‘below average’ water deficit (light blue), ‘above average’ water deficit (orange) and ‘high’ water deficit (red). When the temperature drops below zero, this can trigger what is known as frost shrinkage of the stem. The percentage of trees with frost shrinkage are marked with a star.

The lower panel shows the same information as above, but this time for different regions of Switzerland.

Data source: TreeNet, automatic data analysis with filtered data set.

TreeNet Switzerland collects continuous data on stem radius fluctuations measured with point dendrometers from trees all over Switzerland and estimates drought and growth indicators for Swiss forest ecosystems. We closely collaborate with the Long-term Forest Ecosystem Research Programme (LWF/WSL), the ETHZ, the Institute for Applied Plant Biology (IAP), and the University of Basel.