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.