TAILIEUCHUNG - Báo cáo lâm nghiệp: "Effect of shelter tubes on establishment and growth of Juniperus thurifera L. (Cupressaceae) seedlings in Mediterranean semi-arid environment"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Effect of shelter tubes on establishment and growth of Juniperus thurifera L. (Cupressaceae) seedlings in Mediterranean semi-arid environment" | Ann. For. Sci. 62 2005 717-725 717 INRA EDP Sciences 2005 DOI forest 2005062 Original article Effect of shelter tubes on establishment and growth of Juniperus thurifera L. Cupressaceae seedlings in Mediterranean semi-arid environment María Noelia Jiménez Francisco Bruno Navarro María Ángeles Ripoll Inmaculada Bocio Estanislao De Simón Departamento Forestal Área de Recursos Naturales Centro de Investigación y Formación Agraria Instituto de Investigación y Formación Agraria Pesquera Alimentaria y de la Producción Ecológica de Andalucía Camino de Purchil s no. Aptdo. 2027 18080 Granada Spain Received 15 July 2004 accepted 13 April 2005 Abstract - This paper evaluates the growth and survival of Juniperus thurifera L. seedlings planted using or not the shelter tube Tubex in Mediterranean semi-arid agricultural lands . Spain . Biometrical data were recorded on the plants in the field during two years and several seedlings were extracted by random at the end in order to measure additional morphological parameters related to root system. Micrometeorological measurements were collected on the experimental site to characterize the microclimate induced by the treeshelters. A survival level of 100 was registered inside and outside the shelter. However an increment of absolute maximum temperature and an important reduction of radiation detected inside the shelter could make the plants grow higher and to increase their foliage surface with a significant negative effect upon the root biomass quantity of fine and thick roots length of the main root and root collar diameter which constitute the key for its survival in climates in which hydric resources are scarce and the plants are subjected to long periods of xericity. Therefore the use of the shelter tubes seems inadvisable at least in these environments and for species with these characteristics. semi-arid treeshelter radiation root biomass Juniperus thurifera Résumé - Effets des tubes protecteurs dans l installation

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