Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Tree density and site quality influence on Pinus halepensis Mill. reproductive characteristics after large fires. | Ann. For. Sci. 64 2007 649-656 INRA EDP Sciences 2007 DOI forest 2007043 Available online at Original article Tree density and site quality influence on Pinus halepensis Mill. reproductive characteristics after large fires Daniel M0YAa Josep M. ESPELTAb Iraima VERKAlKb Francisco LÓPEZ-SERRANOa Jorge DE LAS HERASa a Escuela Técnica Superior de Ingenieros Agrónomos de Albacete Universidad de Castilla-La Mancha Campus Universitario s n. 02071 Albacete Spain b CREAF Centre for Ecological Research and Forestry Applications Universidad Autonoma de Barcelona 08193 Bellaterra Spain Received 29 November 2006 accepted 24 January 2007 Abstract - In Spain many Pinus halepensis Mill. forests have been seriously affected by significant forest fires in the past decade in 1994 alone more than 100 000 ha were burned in Eastern Spain. In order to study the reproductive characteristics of P halepensis after forest fires six locations were selected in four areas affected by serious fires in the summer of 1994 and the following different precipitation zones were studied dry-subhumid dry and semi-arid. Ten years after the fires data relevant to the production of pine cones serotinous grey mature brown immature green and opened cones was collected from areas with natural post-fire regeneration. Various cone and seed characteristics such as pine cone seed number and weight and germination percentage were measured. The results showed greater production of cones and strobili in high-density sites. The biggest cone sizes volume and seed number per cone were related to site quality dry-subhumid precipitation zone . Also viability and germination percentages were higher with better site quality with significant differences in values for serotinous and non-serotinous cones. Despite these differences the canopy seed bank was large enough to ensure regeneration in this area for this age stand. Pinus halepensis serotiny canopy seed bank natural regeneration Résumé - .
