tailieunhanh - Báo cáo lâm nghiệp: "Effects of silviculture treatments on vegetation after fire in Pinus halepensis Mill. woodlands (SE Spain)"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Effects of silviculture treatments on vegetation after fire in Pinus halepensis Mill. woodlands (SE Spain). | Ann. For. Sci. 61 2004 661-667 INRA EDP Sciences 2004 DOI forest 2004068 661 Original article Effects of silviculture treatments on vegetation after fire in Pinus halepensis Mill. woodlands SE Spain Jorge De Las Heras Ana González-Ochoa Francisco López-Serrano María Eugenia Simarro Escuela Técnica Superior de Ingenieros Agrónomos de Albacete Universidad de Castilla-La Mancha Campus Universitario s n 02071 Albacete Spain Received 12 January 2004 accepted 18 June 2004 Abstract - In August 1994 two great fires occurred in SE Spain burning 44000 ha of mature Pinus halepensis Mill. forests. Experimental silviculture treatments were carried out on five-year-old P. halepensis seedlings from natural regeneration thinning to a final density of 1 600 trees ha total scrubbing thinning plus scrubbing thinning plus pruning to half the total height scrubbing plus pruning and thinning scrubbing plus pruning. Treatments were carried out in 45 permanent plots located in two localities with different ombroclimates semiarid and dry. Two years after treatments were carried out floristic richness diversity life form rates and vegetation cover were measured or estimated for each plot. Results showed a high capability of post-fire colonizing vegetation to rapidly recover the ecological values recorded before carrying out silviculture treatments. Floristic richness and cover values did not vary significantly. Significant differences in the vegetation life form rate were detected after thinning and scrubbing. Therophyte cover showed a significant increase two years after these treatments. great fire forest management Mediterranean ecosystem pine seedlings Résumé - Effets des traitements sylvicoles sur la vegetation après un feu dans des forets de Pinus halepensis Mill. sud-est de l Espagne . En aoũt 1994 deux grands feux se sont produits dans le sud-est de l Espagne et ont brũlé 44 000 ha de forêt de Pinus halepensis Mill. adultes. Après le feu il y a eu une régénération intense de