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The paper shows the results of a small-scale R&D project on early silviculture of Norway spruce, carried out in a pure plantation of 0.4 ha, 2 x 1 m (5,000 plants ha-1), established in 2001. In 2009, following the application of an access pruning on all stand trees, 60 ”potential” final crop trees were selected throughout the stand, based on the vigour-quality-distribution criteria, being subsequently pruned up to 4-4.5 m. In the same year, two plots, each of 300 sq.m, were established and a mixed and heavy cleaning-respacing was carried out classically (typical to stand silviculture, in plot 1) or dynamically (as in case of crop tree silviculture, in plot 2). A classical cleaning-respacing (mean canopy cover 80% after intervention) was also performed at stand level, leaving the ”potential” final crop trees in a free-growth state at the crown level. A mixed thinning, similar to the intervention in 2009, was carried out at both plot and stand level in 2013, with the remaining density of 1,167 trees ha-1 (plot 2) and 1,567 trees ha-1 (plot 1) and basal area of 20.67 sq.m ha-1 (plot 2) and 23.47 sq.m ha-1 (plot 1). In 2020, the mean arithmetic diameter and mean quadratic diameter of trees in plot 2 and ”potential” final crop trees reached 20 cm. Out of these trees, over 50% are at least 20 cm in diameter. The basal area in plots 1 and 2 is over 35 sq.m ha-1 so a new thinning is due to be carried out in 2020, to reduce the basal area under the critical value of 30 sq.m ha-1. Mean height reached 15 m in 2020, and the slenderness (stability) index has grown significantly only in plot 1, reaching the value of 85. The R&D project showed clearly the possibility of producing Norway spruce trees of 20 cm d.b.h. in 20 years, by using intensive crop tree silviculture started earlier, during the thicket development stage.

Silvotehnica molidișurilor artificiale, pure și tinere, din România: un exemplu