Erratum to: Annals of Forest Science

DOI 10.1007/s13595-013-0291-y

In the original article the Gini index on page 6 is not correctly displayed.

The correct equation reads:

$$ \begin{array}{c}\hfill Gini=\frac{{\displaystyle {\sum}_{i=1}^N{\displaystyle {\sum}_{j=1}^N\left|{g}_j-{g}_i\right|}}}{2\kern0.5em N\kern0.5em {\displaystyle {\sum}_{i=1}^N{g}_i}}\hfill \\ {}\hfill =\frac{{\displaystyle {\sum}_{i=1}^N{\displaystyle {\sum}_{j=1}^N\left|{g}_j-{g}_i\right|}}}{2\kern0.5em {N}^2\kern0.2em \overline{g}}\end{array} $$

Everything else in the paper remains correct.