TAILIEUCHUNG - Báo cáo khoa học: "Leaf area and tree increment dynamics on a fertile mixed-conifer site in southern Finland"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Leaf area and tree increment dynamics on a fertile mixed-conifer site in southern Finland. | 237 Ann. For. Sci. 56 1999 237-247 Inra Elsevier Paris Original article Leaf area and tree increment dynamics on a fertile mixed-conifer site in southern Finland Kevin L. O Hara Erkki Lăhde Olavi Laiho Yrjo Norokorpi Timo Saksa Finnish Forest Research Institute Parkano Research Station Kaironiementie 54 39700 Parkano Finland Received 3 March 1998 accepted 16 June 1998 Abstract - Ratios of volume increment to photosynthetic area were used to provide measures of growing space efficiency in Scots pine Pinus sylvestris L. and Norway spruce Picea ahies L. Karst. dominated stands on a productive site in southern Finland. Eight plots were established in a stand treatment study and three plots in nearby untreated Scots pine stands. Treatments included low thinnings individual tree selection cuttings and untreated controls. Projected leaf area of individual trees was represented by sapwood cross-sectional area at the crown base. Ratios of volume increment to leaf area index LAI for stands and species and ratios of volume increment to sapwood cross-sectional area were used to assess the relative growing space efficiency of stand components. LAI was greatest in stands dominated by Norway spruce. Strong relationships were observed between individual tree volume increment and sapwood area of both Scots pine and Norway spruce. For both species these relationships were improved when developed separately for lower and upper crown classes. Inra Elsevier Paris. Picea abies I Pinus sylvestris leaf area index crown efficiency mixed species Resume - Surface foliaire et dynamique d accroissement des arbres dans des peuplements melanges de coniferes dans une station fertile de Finlande méridỉonale. Les rapports entre 1 accroissement en volume et les surfaces photosynthétiques ont été utilises pour mesurer Pefficacite de 1 espace disponible pour la croissance des arbres dans des peuplements melanges de pin Sylvestre Pinus sylvestris L. et d epicea commun dans une station fertile de .

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