142. The residual forest of a block cutting must be preserved inside the limit of the harvest site until it may be harvested. It may be harvested only on the expiry of a 10-year period after the date on which block cutting was carried out or, if the regeneration has not yet reached after that period the average height of 3 m, until that regeneration has reached such a height.
The first paragraph does not apply to the following sylvicultural treatments carried out in a residual forest:
(1) a commercial thinning or selection cutting carried out according to the applicable sylvicultural prescriptions;
(2) a partial cutting in a mature tree stand or in a stand that will reach maturity in less than 15 years where not more than 35% of the marketable basal area of the stand is harvested, provided that after harvesting, a marketable basal area of at least 15 m2/ha of well-spaced trees composed of species and proportions similar to those of the initial stand, is maintained.
A residual forest of a block cutting may be crossed by a road whose deforestation width does not exceed the width of the right-of-way provided for in Schedule 4 for the class of road to which it belongs or by a watercourse whose width at the limits of the riparian ecotone does not exceed on average 35 m. At the time of indicating a residual forest in the integrated forest management plan, neither the area nor the width of the road or the watercourse may be considered in calculating the area and the width of the residual forest for the purposes of paragraphs 1 and 2 of section 139.