Development of dendrochronological series for Norway spruce, silver fir and sessile oak with applicability in dendroclimatology and dendroecology

摘要

In present work was elaborated 16 index series for Norway spruce, silver fir, stone pine and oak, covered more then 300 years and in variable ecological conditions. Applying the principal component method was possible to study the spatial variability of these dendrochronological series. The first principal component that explain between 35% (all species level) to 60% (same species level), respectively 90% in the case of same geographic zone, represent the common climatic signal. The ecological significance of the second component is changing from species factor to regional environmental factor, together with the human intervention in the case of series from Rodna Mountains. Graphical analysis of primary growth index permits the identification of frequency and intensity of great disturbances. Interesting is the disturbance of 1815 - 1820 from Rodna mountain which is very evident in the Pinus cembra chronology, that coincide with the installation of the stands from BILC and BILB. The dendroclimatological application was developed in the base of spruce and fir chronology and with help of the meteorological parameter from Campulung Moldovenesc weather station. The growth of spruce is negative, high correlated, with temperature from the end of last vegetation period and positive correlated with the precipitation of the same period. In the case of silver fir, the reaction is similar but less significant. The precipitation regime from the beginning of vegetation season has a positive influence for both species growth. The reaction to temperature of July - August is antagonist, spruce having a reduction of growth and silver fir an acceleration of cambial activity. By the transfer function, for Campulung Moldovenesc region was reconstructed the historical dynamics of March temperature and September precipitation for last 300 years. The years with rainfall over 10 mm 1946, 1927, 1890, and 1862 are confirmed by historic notes like droughts autumn. Keywords: dendrochonological series, dendrochronology, dendroclimatology, spatial variability.