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Szczecin harbours Poland’s largest London plane tree population. The London plane trees growing in Szczecin’s Żeromski Park were subjected to dendroclimatological research (analyses of signature years and response function). The study was based on a composite site chronology, signed ZER, spanning 105 years (1900–2004); the mean annual tree ring growth was 2.59 mm. Precipitation, particularly that in late winter- early spring and in the summer months was found to be a factor decisive for the tree’s cambial activity. A high sum of precipitation during the periods mentioned induced positive growth responses in the trees. Thermal conditions during the growth period proved to be another factor controlling the annual tree ring growth, as shown by linear relationships. The tree ring growth-climate relationships in the population under study as well as the between-parks differences in the London plane tree response can be explained by differences in habitat conditions. The trees under study grow in the vicinity of a busy, frequently repaired street and are surrounded by pavement and/or hardened road surface, which greatly limits the infiltration of moisture supplied by precipitation.
The paper presents results of measurements for annual ring widths in reaction, opposite and lateral wood formed in the same vegetation periods in pine (Pinus sylvestris L.). In the compared wood tissues tracheid lengths was also measured. The widest annual rings were found in the reaction wood zone. In that area of the stem cross-section tracheids were by approx. 20% shorter than those located on the opposite side of the pith.
The aim of undertaken research was recognition the reasons of dying out the common juniper Juniperus communis L. ssp. communis population in the forest nature reserve “Jałowce” (Pomerania). Applied methods of dendrochronological analysis let to determine the age of juniper-stand in the reserve and describe the influence of climatic conditions on its growth. Obtained results testify to Juniperus communis chronology with signature WIE collected from 17 individual sequences which numbered 102 tree ring width and represented a time span 1903 to 2004. Such results described the juniper-stand in the reserve as ageing population with the oldest specimen at age 98 years. However, the last several years were characterised by the lack of strong growth depressions typical for earlier time periods with tree ring width ranged 0.7–1.0 mm (themean annual tree ring width amounted to 0.85 mm), but the visible symptoms of degeneration and dying out of protected common juniper population intensified probably because of its age.
Über die Jahrringbreite der Bäume nach: Harsdörffer 1651, Hill 1770, Erxleben 1787, v. Wernecke 1791, Hill 1770,Jester 1815, Schübler und Neuffer 1830, Nördlinger 1860. In der Arbeit wurde ausführlich die deutsche Fachliteratur aus dem 17. bis ins 19.Jh zitiert, in der das Thema Jahrringbreite besprochen wird.
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