For regrowth stands in the northern jarrah (Eucalpytus marginata) forests of Western Australia, a study was undertaken of the amount of wood, not commercial under current standards, that would be produced if the stands were thinned as a silvicultural treatment. Trees greater than 15 cm dbhob along strip lines were assessed for a range of wood products, and then selected for retention to give either 10, 20 or 30 canopy cover (the original canopy cover was 55). The study area was then actually thinned to leave a 20 canopy cover, which yielded 90 m3/ha of currently unsaleable bole wood, though two thirds of the jarrah conponent of this was assessed as potentially unable, most of it being of good quality but under the currently accepted minimum log diamenter of 50 cm. The use of these small diameter logs is therefore a major problem to which research should be directed. The benefits of silvicultural treatment of the forest are discussed.
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