TAILIEUCHUNG - Báo cáo lâm nghiệp: "Fertilization at planting impairs root system development and drought avoidance of Douglas-fir (Pseudotsuga menziesii) seedlings"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Fertilization at planting impairs root system development and drought avoidance of Douglas-fir (Pseudotsuga menziesii) seedlings. | Ann. For. Sci. 61 2004 643-651 INRA EDP Sciences 2004 DOI forest 2004065 643 Original article Fertilization at planting impairs root system development and drought avoidance of Douglas-fir Pseudotsuga menziesii seedlings Douglass F. jACOBSa b Robin ROSEa Diane L. HAASEa Patricio O. ALZUGARAYa c a Department of Forest Science Oregon State University Corvallis OR 97331-5752 USA b Current address Hardwood Tree Improvement and Regeneration Center HTIRC Department of Forestry and Natural Resources Purdue University West Lafayette IN 47907-2061 USA c Current address Chilean Forestry Institute INFOR camino a Coronel Km Concepción Chile Received 18 July 2003 accepted 12 January 2004 Abstract - Douglas-fir Pseudotsuga menziesii Mirb. Franco seedlings 1 1 bareroot were divided into 8-13 cm1 3 and 23-35 cm3 initial root-volume categories and either not fertilized or fertilized with 60 g Apex in the planting hole at a drought-prone clearcut site in the Oregon Coast Range USA. Regardless of initial root volume fertilized seedlings consistently reached lower predawn xylem water potential Txykmi values than non-fertilized seedlings during summer. Roots did not proliferate relative to fertilizer placement and mean values for lateral-root length root tips and root biomass were less for fertilized seedlings in each of four vertical root zones. Poor root system development of fertilized seedlings may have been associated with the rapid release of high fertilizer salt concentrations into the rhizosphere. Root-volume growth was positively correlated with Xylem emphasizing the importance of new root growth following planting for drought avoidance. Criteria for successful field fertilization must consider the anticipated drought level of the site. seedling controlled-release fertilizer root architecture drought avoidance Pseudotsuga menziesii Résumé - La fertilisation à la plantation perturbe le développement du système radiculaire et réduit la resistance à la sécheresse des

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