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Báo cáo lâm nghiệp: "Plasticity in growth, biomass allocation and root morphology in beech seedlings as induced by irradiance and herbaceous competition"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Plasticity in growth, biomass allocation and root morphology in beech seedlings as induced by irradiance and herbaceous competition" | Ann. For. Sci. 62 2005 51-60 INRA EDP Sciences 2005 DOI 10.1051 forest 2004092 51 Original article Plasticity in growth biomass allocation and root morphology in beech seedlings as induced by irradiance and herbaceous competition Thomas CURTa b Lluis COLLa Bernard PRÉVOSTOa Philippe BALANDIERa Georges KUNSTLERa a Cemagref Applied Ecology of Woodlands BP 50085 63172 Aubière France b Cemagref - UR Agriculture et Forêt Méditerranéennes 3275 route Cézanne BP 31 le Tholonet 13612 Aix-en-Provence Cedex 1 France Received 16 October 2003 accepted 31 August 2004 Abstract - Biomass increment biomass allocation and fine-root morphology were compared on four-year old Fagus sylvatica seedlings growing under low 11 relative irradiance medium 14-19 or high 46 irradiance under natural Pinus sylvestris canopies and under full light in a weeded meadow in the French Massif Central. Significant differences in biomass increment were found among plots in relation to light regime and interspecific competition. Light regime had little effect on shoot-to-root ratio and biomass allocation but had a clear impact on above- and belowground morphological variables. Beech seedlings displayed a lower specific root length SRL and a higher specific leaf area SLA under shade thus indicating morphological adjustment to shade. Similarly competition from herbaceous vegetation had a negligible effect on seedling growth and biomass allocation but significant impact on fine-root morphology. Low SLA and high SRL values at high irradiance coincided with high growth increments. biomass allocation European beech Fagus sylvatica L. fine-root architecture interspecific competition irradiance Résumé - Plasticité de la croissance de l allocation de biomasse et de la morphologie racinaire chez les semis de hêtre provoquée par l éclairement et la compétition herbacée. L accroissement de biomasse les patrons d allocation de biomasse et la morphologie des racines fines ont été compares sur des plants de hêtre Fagus .