Unit:
Department of Geology and GeoenvirommentLibrary of the School of Science
Supervisors info:
Μαρία Χατζάκη, Επίκουρη Καθηγήτρια, Τμήμα Γεωλογίας και Γεωπεριβάλλοντος, ΕΚΠΑ
Original Title:
Μελέτη της επίδρασης του κλίματος στην ανάπτυξη των ειδών Abies cephalonica και Pinus halepensis στην Πάρνηθα
Translated title:
Study of the impact of climate on the growth of Abies cephalonica and Pinus halepensis species in Parnitha
Summary:
Climate constitutes the keystone of the whole ecosystem’s survival and growth, through the centuries. The appropriate study of the climate is largely based on the study of the paleoclimate. The analysis of the paleoclimate data provides information about biological species, geological formations and other phenomena that had prevailed during the geological time. The study of the above applies also to the modern world even to the future. Therefore, it becomes apparent how important is to investigate the relation between climate and forest ecosystem through the science of the Dendrochronology.
In the present study, we analysed the tree rings data that were collected during two prior campaigns in the mountain of Parnitha. The studied species are Abies cephalonica and Pinus halepensis, which are known to be sensitive to the environmental and climatic changes. The time series of the rings were processed and detrended, with the aid of an appropriate statistical package in R language. Then, the resulted timeseries of all sampling sited were correlated with climate data of temperature and precipitation derived from the historical climate station of the National Observatory of Athens, which is the oldest research institute in Greece.
It was found that two sampling sites (PHP4, PHP6) exhibit statistically significant correlations with both climate parameters, and they both belong to the species of Pinus halepensis. Particularly, there was statistically significant negative correlation with the average annual temperature for both sites. For the first sampling site, negative correlations were found on quarterly periods, from the beginning of autumn until the beginning of spring, and for the second site, for the respective period of autumn and the period of spring-summer. On the contrary, positive statistically significant correlation was found between the tree rings of the two sites and the annual (hydrological) precipitation.
The results showed that the sampling sites for which tree rings growth was found to be influenced by the climate conditions, were oriented towards the Attica basin, and therefore are closer to the climate station of NOA. This fact indicates that the geographical location of the selected station is particularly important for such studies.
Main subject category:
Science
Keywords:
Climate, tree rings, Dendrochronology, Parnitha mountain, Abies cephalonica, Pinus halepensis, R language
File:
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Marmataki_thesis.pdf
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File access is restricted only to the intranet of UoA.
