In the event of a merger between one or more forestry groupings and one or more forestry savings companies, or between several forestry savings companies, the sustainable management commitments in accordance with 3° of 1 of article 793 of the General Tax Code of the same code by one or more forestry groupings prior to this merger or taken over by one or more forestry savings companies at the time of previous mergers are taken over by the absorbing forestry savings company, for the remaining periods, on the parcels that the forestry groupings and forestry savings companies contribute to the merger operation.