In the event of a merger between several forestry investment groups or between one or more forestry investment groups and one or more forestry savings companies or between one or more forestry investment groups and one or more forestry groups, the sustainable management commitments in accordance with 3° of 1 of article 793 of the General Tax Code made by one or more forest investment groups or forestry groups prior to this merger or taken over by one or more forestry savings companies during previous mergers are taken over by the absorbing forestry investment group, for the remaining periods, on the plots of land that the forestry investment groups or forestry groups or forestry savings companies contribute to the merger operation. The length of time that members hold their shares is counted from the date of their initial acquisition in their original structures.