TAILIEUCHUNG - Báo cáo lâm nghiệp: "Direct sowing of holm oak acorns: effects of acorn size and soil treatment"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Direct sowing of holm oak acorns: effects of acorn size and soil treatment. | Ann. For. Sci. 63 2006 961-967 INRA EDP Sciences 2006 DOI forest 2006079 961 Original article Direct sowing of holm oak acorns effects of acorn size and soil treatment Francisco Bruno NAVARROa María Noelia JlMÉNEZa María Ángeles RlPOLLa Emilia FernAndez-OndoNOb Eduardo GALLEGOa Estanislao De SlMONa a Grupo de Sistemas Forestales Área de Recursos Naturales Centro de Investigación y Formacion Agraria Institute Andaluz de Investigación y Formacion Agraria Pesquera Alimentaria y de la Production Ecológica . Junta de Andalucía Camino de Purchil s no Aptdo. 2027 18080 Granada Spain b Departamento de Edafologia y Química Agrícola Facultad de Ciencias Universidad de Granada C Severo Ochoa s no. 18071 Granada Spain Received 14 February 2006 accepted 27 June 2006 Abstract - A nursery experiment under optimal controlled conditions and a parallel field trial under conditions of severe water stress were conducted to test the influence that acorn size and soil preparation only in field exert on the survival and development of this species. The soil preparation consisted of preparing seed beds with a backhoe. The size and weight of the acorn were the factors that most controlled the development of this species in the nursery while in the field under conditions of water stress only acorn weight was related negatively to the root shoot ratio. Water availability was also found to be a strongly limiting factor for plant development when the results of the two experiments were compared. In the field the prior soil preparation negatively affected survival 65 with respect to control 95 RCD and R S ratio. In conclusion given the low precipitation during the study period and the low survival results reported by other researchers with the introduction of seedlings even in higher-rainfall localities sowing acorns directly in the field should be reconsidered as a viable technique for restoring holm oak forests for forestation on agricultural lands or the diversification of .

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