Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:" Dendrochronology of pedunculate oak (Quercus robur L.) in an old-growth pollarded woodland in northern Spain: tree-ring growth responses to climate" | Ann. For. Sci. 62 2005 209-218 INRA EDP Sciences 2005 DOI forest 2005012 209 Original article Dendrochronology of pedunculate oak Quercus robur L. in an old-growth pollarded woodland in northern Spain tree-ring growth responses to climate Vicente ROZASa b a Departamento de Biología de Organismos y Sistemas Universidad de Oviedo Catedrático Rodrigo Uría 33071 Oviedo Spain b Present address Departamento de Ecología Centro de Investigaciones Forestales y Ambientales de Lourizán Carretera a Marín km 4 Apartado 127 36080 Pontevedra Spain Received 13 November 2003 accepted 15 September 2004 Abstract - Both time-independent and time-dependent responses of radial growth in pedunculate oak Quercus robur L. to climate were investigated in an old-growth woodland in the Cantabrian lowlands northern Spain. This was done by using correlation analysis bootstrapped response functions and Kalman filter analysis. Responses to climatic factors were explored in three different oak age-classes young 120 years mature 170-225 years old and old-growth trees 250-470 years. Time-independent climatic models showed age-specific responses. Between to of ring-width discovered variance was explained by weather conditions in the period 1940-1998. Radial growth of young oaks was limited by the temperatures in June of the year the ring was formed while mature and old-growth oaks showed a negative response to winter and summer temperatures and a positive one to summer precipitation. Time-dependent models revealed that the effect of several climatic variables on tree growth was not constant through time. This variability could be explained by physiological changes related to tree ageing while it was unrelated to changes in other environmental factors. Overall these results suggest that any assumption of an ageindependent climate-growth relationship for oak in the studied locality is unreliable and anticipate the probable responses of oaks growing in old-growth woodlands to global .
