Figure 3.

Relative importance of temperature, water, nutrients, and soil aeration in explaining the distribution of the 12 studied tree species. Relative importance is based on pure contributions derived from grouped variable GLMs with cover abundance of mature trees as the response variable and four grouped environmental predictors—temperature, water, nutrients, and soil aeration—based on data from 1,075 study plots across Switzerland. To get relative importance, the pure contributions of the four grouped predictors were converted to relative ones so that the sum of the pure contributions of the four grouped predictors was set to 100% for each species. For pure contributions (adj.D ²) of the four grouped predictors and of the full models, see Table4