tailieunhanh - Báo cáo lâm nghiệp: "Divergence among species and populations of Mediterranean pines in biomass allocation of seedlings grown under two watering regimes"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Divergence among species and populations of Mediterranean pines in biomass allocation of seedlings grown under two watering regimes. | Ann. For. Sci. 64 2007 87-97 INRA EDP Sciences 2007 DOI forest 2006092 87 Original article Divergence among species and populations of Mediterranean pines in biomass allocation of seedlings grown under two watering regimes Maria Regina Chambel José Climent Ricardo AlÍa Institute Nacional de Investigation y Tecnología Agraria y Alimentaria INIA Apto 8111 28080 Madrid Spain Received 27 February 2006 accepted 4 April 2006 Abstract - Seedlings of four populations each of Pinus pinaster P. halepensis P canariensis and P pinea were grown in controlled conditions to evaluate both inter- and intra-specific differences in response to watering. We submitted half of the plants to a moderate water stress and after 22 weeks we recorded height stem diameter and root stem and leaves dry weight. Patterns and amounts of phenotypic changes including changes in biomass allocation were analysed. We found a scant response in P canariensis P pinaster and P halepensis presented high population divergence for phenotypic changes and P. pinea showed marked allocational shifts and no population divergence. The phenotypic changes observed within species are interpreted as a plastic response. The variation encountered within P. halepensis and P. pinaster may be indicative of specialisation to either resource-rich or resource-poor habitats being populations from favourable sites more plastic. P pinea exhibited a very uniform plastic response indicating generalist behaviour. phenotypic changes early testing pine drought stress ontogeny Résumé - Divergences parmi les espèces et populations de pins méditerranéens pour l allocation de biomasse chez des semis poussant sous deux régimes d alimentation hydrique. Des semis de quatre populations de Pinus pinaster de P halepensis de P canariensis et de P pinea ont été élevés en conditions contrôlées pour évaluer au niveau inter- et intra-spécifique les differences de réponse au régime d alimentation hydrique. Nous avons soumis la moitié des .