TAILIEUCHUNG - Báo cáo khoa học: "Detecting the impact of climate and disturbances on tree-rings of Fagus sylvatica L. and Quercus robur L. in a lowland forest in Cantabria, Northern Spain"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Detecting the impact of climate and disturbances on tree-rings of Fagus sylvatica L. and Quercus robur L. in a lowland forest in Cantabria, Northern Spain | 237 Ann. For. Sci. 58 2001 237-251 INRA EDP Sciences 2001 Original article Detecting the impact of climate and disturbances on tree-rings of Fagus sylvatica L. and Quercus robur L. in a lowland forest in Cantabria Northern Spain Vicente Rozas Departamento de Biología de Organismos y Sistemas Universidad de Oviedo Catedrático Rodrigo Uría 33071 Oviedo Spain Received 18 April 2000 accepted 9 October 2000 Abstract - The influence of climate and disturbances on tree-ring widths of European beech and pedunculate oak were evaluated in a lowland forest of Northern Spain. From 1925 to 1980 36 of the variance of beech ring-width and 29 of the oak one was explained by climate. The climatic models showed that low precipitation in July of the previous year limited the radial growth of beech while oak one was instead restricted by water deficits in July of the current year. Ten main disturbance periods were identified from 1780 to 1997 among which the 1922-1935 one was the most important. Since beech trees showed suppressed growth from 1800 to 1920 probably the forest canopy became denser during this time. The disturbance periods identified in 1922-1935 and 1948-1953 contributed to both increase the growth of beech above the expected and intensify its climatic response. On the other hand deviations of oak growth from the expected without-disturbance indices agreed with the disturbance history up to 1850. From 1850 to 1997 oak growth became independent from disturbances sequence yielding a constant climatic response in 1925-1980. The opposite effects of disturbances on both the radial growth and the climatic response of European beech and pedunculate oak are related to their different tolerance to shade. These results have relevant methodological implications on the analysis of climate-growth relationships and on the reconstruction of past disturbance regimes by means of dendroecological techniques. dendroecology ring width response function forest disturbance Kalman filter .

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