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Dr. ing. Cătălin-Constantin Roibu ing. Daniel Wenţel
Drd.ing. Bogdan-Mihai Negrea
International Symposium "Forest and Sustainable
Development" 2012
Symposium dedicated to the commemoration of the 100th birth
anniversary of Prof. Dr. Mihail PRODAN
Purpose:
This article aims a quantification and comparative analysis of
climate–tree relationship for spruce based on an altitudinal
transect in Lala Valley of the Rodna Mountains National Park.
Objectives:
O1 To develop dendrochronological series on spruce in the
Lala Valley for three altitudinal levels;
O2 To determine the pointer years for the three altitudinal
levels;
O3 quantification of the pluviometrical and thermic regime
over the growth processes for all altitudinal levels
sampled.
For each altitudinal level were extracted 2 growth samples per tree in an amount of 30 trees;
The annual tree rings were measured using the system LINTAB 6 in the biometrics laboratory of the Forestry Faculty;
TSAPwin program, with an accuracy of 0.001 mm was used; Also the crossdating of the growth series was realized with TSAPwin software and
COFECHA software; Standardization of the series was performed by applying a cubic spline function of
67%n criteria. Average series of standardized growth index was obtained through the biponderate mean (Cook and Kairiukstis, 1990);
The developed dendrochronological series, RES type indices, was obtained by removing the correlation;
The correlation between meteorological parameters and the dendrochronological series elaborated was made for individual values, from June the year before the tree ring formed to August current year when the ring was formed.
Quantifying of the climate model required use of the response functions method calculated with BootRes Pack software (The CRAN project).
There were made a number of three
dendrochronological series on the three
altitudinal levels:
- PALA-HA hight altitude spruce (1700 m),
- PALA-MA average altitude spruce (1400 m),
- PALA-LA low altitude spruce (1000 m).
The connection between growth indexes and the average
temperature
1901-2009 reaction
Low altitude spruce reaction
7.1 Temporal stability of series PALA-HA, PALA-MA, PALA-LA
Moving correlation between growth indexes and June temperature.
Spatial correlation map between dendrochronological series and June temperature.
1901-2009 1901-1940 1950-2009
Spatial correlation map between dendrochronological series and June temperature.
1901-2009 1901-1940 1950-2009
Spatial correlation map between dendrochronological series and June temperature
1901-2009 1901-1940 1950-2009
There were identified years of great drought for all
three dendrocronological series in Lala valley.
-PALA-HA years 1913, 1948 ,2003,
-PALA-MA years 1913, 1929, 1948,
-PALA-LA years 1947, 2003,
Was shown the strong influence of the temperatures in
summer months (June, July) on the growth pattern of
Norway Spruce.
Was observed that the series of low altitude developed a total
different pattern of growth in dictate by June and July
temperature.
Through the correlation functions was determined that the growth
pattern of the spruce on low altitude was similar with the other
series but only until the forth decade of the last century.
Was analyzed the total different response of the low altitude
spruce reaching the conclusion that this fact is climatic
determinate, because of the extreme drought of the years 1946-
1947.
Also was shown the temporal stability of climate –growth
relationship (highlighted by the high correlation between growth
index and June, July temperature) at medium and high altitude.
A semnificative spatial correlation between the growth indexes and
the average temperature of June until year 1940 was made for the
dendrochronological series of medium and high altitude.
As a general conclusion has been highlighted that one climatic
major event (as “great drought” of 1946 year) not only
determinates the ring width in that year, but may change the
growth pattern (behavior) of a species at different altitudinal range.
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