Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı

Clımatıc Varıabılıty And Tree Rıng Growth In Western Anatolıa

Dendroclimatology, which is one of the sub-disciplines of Dendrochronology, was used to find past climate history, and especially past dry and wet years. Many important dendroclimatological studies were performed, and climate history for the last centuries in many parts of the world was determined. In this study the purpose was (1) to constitute sensitive black pine chronologies to climate for West Anatolia, (2) to determine the relationships between tree-rings and climate, (3) to perform climatic reconstructions for the region and to find past dry and wet years, (4) to make field reconstructions, and (5) to determine dendroecological relationships between tree-rings of black pine and climate in different regions.

The study area is West Anatolia, composed of West Black Sea Region, Marmara Region, West Mediterranean Region and west part of Inner Anatolia. Its latitude and longitude are 36º-42º N and 26º-34º E, respectively. In this area, because black pine has a very wide distribution and can grow around steppe area and produce sensitive tree rings to climate, this tree species was selected for the study.

The increment cores were taken from the breast height of trees by using Pressler Increment Borer with 50 cm in length. 10 or 15 trees were sampled for each site, and 2 cores were extracted from each tree.

After preparing the cores, measurements were performed using LINTAB-TSAP Measuring System. To check the quality control of the measurements COFECHA program was used, and false and missing ring problems were eliminated. GL values and correlation coefficients between individual trees were calculated. Signal-to-noise value was found for each site to find the significancy of the signal to climate.

In dendroclimatological analysis, response functions were calculated for each site by using principle component analysis. Because a high and significant relationship was found between tree-ring width and may-june precipitation, local and field reconstructions for total precipitation in these two months were performed. In local reconstructions and field reconstructions, principle component and spatial-temporal analysis were performed, respectively. Response functions and cluster analysis were used in dendroecological works.

With this study total 17 black pine site chronologies from Karabük, Bolu, Kastamonu, Afyon, Denizli, Burdur, Ankara and Eskişehir were constructed The longest chronologies was from Denizli and Burdur-Gölhisar. The longest one is from Denizli-Sandras Mountain (ESK) with 842 years. The other longest ones are TEF with 731 years, and BON with 721 years.

Local reconstructions for total may-june precipitation were performed for four stations, which have the longest records, 1931-2005, in the region. The reconstructions covered 320 years (1685-2004) for Afyon, 332 years (1673-2003) for Eskişehir, 373 years (1632-2004) for Kütahya and 546 years (1459-2004) for Isparta Meteorology Stations.

Dry years in West Anatolia had generally one-year duration (1650, 1660, 1693, 1725, 1746, 1764, 1779, 1790, 1794, 1819, 1830, 1832, 1840, 1870, 1879, 1887, 1909, 1916), rarely two-year duration ((1715-16, 1851-52, 1867-68, 1893-94, 1927-28). Three or more-year duration of dry years were not observed in the region.

Wet years in West Anatolia had generally one-year duration (1643, 1665, 1681, 1689, 1700, 1712, 1717, 1727, 1737, 1739, 1744, 1755, 1762, 1780, 1788, 1795, 1818, 1827, 1846, 1848, 1855, 1876, 1881, 1885, 1891, 1897, 1901), rarely two-year duration (1770-71, 1835-36, 1919-20). Three or more-year duration of wet years were not observed in the region.

After local reconstructions, field reconstructions were performed, and the years 1794, 1887 and 1893 were found as extremely dry years, and the years 1835, 1876, 1881 and 1901 were found extremely wet for the entire region. The years 1788, 1795, 1827 and 1919 were wet for the south and inner parts of West Anatolia.

In dendroecological analysis, total 28 site chronologies were used. Responses to temperature and precipitation were divided to four clusters. Most of the chronologies were included in the first cluster. This first cluster was divided to two sub-cluster based on west Black Sea chronologies (first sub-cluster), and west Mediterranean and inner Anatolian chronologies (second sub-cluster). Two chronologies from Antalya (KOP and ALC) were in the second cluster. The third cluster included FIR (Eskişehir) and KEL (Ankara) chronologies. The fourth cluster was HON (Denizli), 2PN (Karabük) and the chronologies from Kazdağları

ŞAHİN Mehmet Serkan ,

Danışman :Prof.Dr.Aytuğ AKASEN

Anabilim Dalı :Orman Mühendisliği

Programı (Varsa) :Ormancılık Politikası ve Yönetimi

Mezuniyet Yılı :2006

Tez Savunma Jürisi :Prof.Dr.Aytuğ AKASEN (Danışman)

:Prof.Dr.AbdiEKİZOĞLU

:Prof.Dr.HakanALTINÇEKİÇ

:Doç.Dr.YalçınKUVAN

:Yard.Doç.Dr.Cihan ERDÖNMEZ