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Corsican pine, Scots pine and Douglas-fir seedlings were grown in containers at a con- stant volume at densities ranging from 100 to over 1 000 plants mBoth shoot and root dry weight of each species decreased with increasing density, especially at densities greater than 500 mIn contrast, shoot height of Corsican and Scots pine increased at high densities, but the height of Douglas-fir was unaffected by density. Shoot height was not correlated with dry weight in Douglas-fir and Scots pine, and was negatively correlated in Corsican pine. Root collar diam- eter was positively correlated with seedling weight in all three species. Increasing the volume of tray cells only increased seedling size in Douglas-fir at densities lower than 400 mSurvival

annales des sciences forestières

Effects of seedling density on the growth of Corsican pine (Pinus nigra var. maritima Melv.), Scots pine (Pinus sylvestris L.) and Douglas-fir (Pseudotsuga menziesii Franco) in containers