Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: 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. | Ann. Sci. For. 55 1998 407 123 Inra Elsevier Paris 407 Original article 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 Richard Jinksa Bill Masonb Forestry Commission Research Agency Alice Holt Lodge Wrecclesham Farnham Surrey GU10 4LH United Kingdom b Forestry Commission Research Agency Northern Research Station Roslin Midlothian EH25 9SY United Kingdom Received 20 May 1997 accepted 29 September 1997 Abstract - Corsican pine Scots pine and Douglas-fir seedlings were grown in containers at a constant volume at densities ranging from 100 to over I 000 plants nr2. Both shoot and root dry weight of each species decreased with increasing density especially at densities greater than 500 m 2. In 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 diameter 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 m 2. Survival of outplanted Douglas-fir seedlings was reduced in plants grown at the highest density I 550 m 2 . Height and diameter increments were greatest in plants raised at intermediate densities around 780 nr2. Inra Elsevier Paris. Pinus nigra var. maritima Pinus sylvestris I Pseudotsuga menziesii I containers density Resume - Effets de la densité des semis sur la croissance du pin noir de Corse Pinus nigra var. maritima Melv. du pin Sylvestre Pinas sylvestris L. et du sapin de Douglas Pseudotsuga menziesii Franco en conteneurs. Des semis de pin noir de Corse pin Sylvestre et sapin de Douglas ont été cultivés en conteneurs à volume constant avec des densités variant de 100 jusqu à plus de 1 000
