Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.

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Feliksik E. , Wilczyński S. 2003. TREE RINGS AS INDICATORS OF ENVIRONMENTAL CHANGE, EJPAU 6(2), #03.
Available Online: http://www.ejpau.media.pl/volume6/issue2/forestry/abs-03.html

ABSTRACT

The aim of the research was to establish the reasons for the deep, long-term depression in tree ring formation, which took place in the period from 1950-1980 in Douglas firs (Pseudotsuga menziesii Franco) growing in southern Poland. 340 tree rings from 17 trees from the Sudety Mts., the Western Beskidy Mts., Eastern Beskidy Mts. and Roztocze underwent dendrochronological analyses. Results indicate Douglas fir’s high sensitivity to air pollution. Long-term drop in tree-ring widths in the years 1950-1980 was probably caused by industrial emissions. Climatic conditions influenced mainly short-term changes in tree-ring sizes and could not have been the cause of long-term depression. The long-term drop in tree-ring widths varied in terms of intensity depending on particular region. It occurred first and with greatest intensity in western Poland, in the Sudety. In the Bieszczady and Roztocze, it took place later and was less intense. Apart from being smaller, the tree-rings were also chara

Key words: Pseudotsuga menziesii, dendrochronology, tree ring, radial increment..

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