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GLIWICE RADIOCARBON LABORATORYCarbon isotopes in tree-ringsTREE RINGS MEASUREMENT IN GLIWICE TREE RINGS LABORATORYTrees are the perfect material for isotopic measurements of the environmental changes. In temperate climate the trees growth in one year cycle (Robertson and Waterhouse 1998), produce two kind of wood in single year. The first kind produced in spring and early summer is called earlywood. The second one is latewood which is produced in summer and autumn. The differences between these two kinds of wood are recognized for each species of tree individually but generally the earlywood has a lower density and higher width than latewood. The most popular tree species used for isotopic investigations are: pine (Pinus Sylvestris), oak (Quercus Robur L.) and fir (Abies). In the case of pine all single year growth (earlywood and latewood) represents the isotopic record in given calendar year... read more
Download MS Power Point presentation Carbon isotopes are widely used as indicators in the study of variability in space and time. Preliminary results are part of a project investigating 13C and 14C concentration changes during last 150 years in Poland, both in industrial and ecologically clean regions, using annual tree rings (Pinus sylvestris, Populus nigra). The results describe the local Suess effect recorded in the industrial Kraków and Upper Silesia regions compared to changes of background radiocarbon concentration caused by global human activity in a "clean region", Augustów Wilderness. The 13C record also shows the influence of the local Suess effect.
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