Regeneration methods for Scots pine and lodgepole pine: a comparison in Central Sweden

Le résumé fourni par la source

The experiment was conducted in a mature Scots pine (Pinus sylvestris L.) stand at the Jädraås Experimental Forest, Central Sweden (60.82° N, 16.50° E, elevation 185 m). The site index (H100), which represents the mean height of the 100 largest-diameter trees per hectare at age 100, was estimated to be 18 m, corresponding to a mean annual increment (MAI) of approximately 3.5 m3 ha−1 y−1. A fully randomised design with nine treatments and four replicates was applied. The study evaluated regeneration methods (planting, direct seeding, natural regeneration), site preparation techniques (disc trenching, wheel tracks), seed sources (seed orchard vs. local seed), and seed tree fertilisation on regeneration success (tree density) and growth of Scots pine and lodgepole pine (Pinus contorta Douglas ex Loudon). Planting resulted in significantly greater height growth compared to direct seeding or natural regeneration. Disc trenching improved natural regeneration, yielding higher tree density, taller trees, and reduced patchiness, whereas wheel tracks provided insufficient soil disturbance to expose mineral soil. Fertilisation of seed trees did not significantly affect tree density. Scots pine and lodgepole pine exhibited comparable height growth and tree density for planted and sown trees, respectively.

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