tailieunhanh - Báo cáo lâm nghiệp: "Morphological and functional variability in the root system of Quercus ilex L. subject to confinement: consequences for afforestation"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:"Morphological and functional variability in the root system of Quercus ilex L. subject to confinement: consequences for afforestation" | Ann. For. Sci. 63 2006 425-430 INRA EDP Sciences 2006 DOI forest 2006022 425 Original article Morphological and functional variability in the root system of Quercus ilex L. subject to confinement consequences for afforestation Jesus PEMANa Jordi VOLTASa Eustaquio GlL-PELEGRINb a Departament de Producció Vegetal i Ciència Forestal Universitat de Lleida Av. Alcalde Rovira Roure 191 25198 Lleida Spain b Unit of Forests Resources CITA de Aragón Avda. Montanana 930 50059 Zaragoza Spain Received 21 June 2005 accepted 3 October 2005 Abstract - We examined root morphological and functional differences caused by restrictions imposed to vertical growth in the root system of holm oak Quercus ilex L. seedlings to assess the consequences of using nursery containers in the development of a confined root system for this species. Thus root morphological topological and functional parameters including hydraulic conductance per leaf unit surface area KRL were investigated in one-year seedlings cultivated in three PVC tubes differing in length 20 60 and 100 cm . Longer tubes showed greater projected root area root volume total and fine root lengths specific root length SRL and KRL values than did shorter tubes. On the other hand the length of coarse roots diameter mm and the average root diameter were greater in shorter tubes. The strong positive correlation found between KRL and SRL r P indicated that root thickness was inversely related to water flow through the root system. We concluded that root systems developed in longer tubes are more efficient for plant water uptake and therefore changes in root pattern produced in standard forest containers . about 20 cm length may in fact prevent a proper establishment of the holm oak in the field particularly in xeric environments. Quercus ilex L. root hydraulic conductance root morphology afforestation Résumé - Variabilité morphologique et fontionnelle du système racinaire de Quercus ilex L. soumis au confinement