48 Contemporary Trends in Geoscience vol . 2 DOI: 10.2478/ctg-2014-0007 Magdalena Opała, Tadeusz Niedźwiedź, Oimahmad Rahmonov Dendrochronological potential of Ephedra equisetina from Zaravshan Mountains Faculty of Earth Science, University of Silesia, Bedzinska Str. 60, 41-200 Sosnowiec. E-mail: (Tajikistan) in climate change studies
[email protected] Key words: Abstract. dendrochronology, climate Samples from Mongolian Ephedra (Ephedra change, shrubs, Ephedra, Zaravshan equisetina Bunge) was collected in the Mountains, Tajikistan. Zaravshan Mountains (the Fann Mountains), Tajikistan. The wood of Ephedra is ring-po- rous with well-defined growth rings. Annual ring widths were measured, individual se- ries were first cross-dated and then averaged as a standard chronology. Correlations were calculated between the standard ring-width chronology and monthly climate data re- corded in the weather station Iskanderkul. Dendroclimatological analysis showed that July temperature is the growth limiting fac- tor of this species. Our study has shown high dendrochronological potential of Ephedra. Contemporary trends in Geoscience vol . 2 49 Introduction Traditionally dendrochronological research are related to arctic or subarctic shrub spe- has been limited to the forests areas. In re- cies. Although Ephedra does produce growth cent years, interest has increased in dendro- rings, which in most cases are of roughly an- chronological studies of shrubs and dwarf nual frequency, the genus has never been used shrubs species. Despite some difficulties (e.g. for dendrochronological research (Earle 2013). sample preparation, cross-dating, limited The aims of this study are: (1) to investigate age) this method has successfully been ap- dendrochronological potential of Ephedra plied to shrubs in various parts of the world from the western Pamir-Alay and deter- (e.g.