The application of the tree-ring chronologies in assessing ecological requirements of Metasequoia glyptostroboides growing in southern Poland

Metasequoia glyptostroboides is considered to be a species highly resistant to harmful environmental factors. For this reason it has been introduced to the cities. The climate of Krakow differs from that in its natural range in China. The research was focused on 40-year-old trees, planted in Kraków on fertile alluvial soils with a low level of ground water, in the vicinity of the steelworks. During the period of the highest level of air pollution in the 1970s and 1980s, the radial increment of investigated trees showed an increasing trend. At the end of the 1980s, when the emissions were reduced, a decreasing trend in radial growth was recorded. Throughout the entire period of their life the investi-gated trees have shown high homogeneity of short-term growth reactions. The sensitivity chronology of the trees was characterized by a high representativeness and a strong high-frequency signal. This may indicate that the investigated trees have shown a large sensitivity to climatic factors. The positive effect on the radial growth of Metasequoia had a cold September in the previous year, and also a cold January, April and May in the year of ring formation. Positive impact on the growth of trees had also the high precipitation occurring in April and August, as well as high air humidity in the spring of the year of ring formation. In the period 1974–2011 fifteen signature years were found. The analysis of the climatic conditions in these years confirms the results of the statistical analyses.     

Attempts at thermoluminescence dating of fired materials from the Przeworsk Culture settlements

The thermoluminescence (TL) dating method has a significant measurement error margin reaching almost 10%. Due to this fact it could be considered as little effective in case of such sites from the Roman period as burial grounds with many artefacts useful for archaeological dating. However, for many settlements from this period, where pottery is the only kind of artefacts, the TL method can give notable results. The main purpose of the study was to make an attempt at TL dating of pottery and clay daub samples from the Nieszawa Kolonia and Kręcieszki sites and to compare the obtained dates with the results of archaeological dating of selected features from the Przeworsk Culture settlements. In the Kręcieszki site the fragments of burnt clay daub were dated by the TL method for the first time in the Lublin laboratory. It turned out that clay daub is an equally good dating material as pottery. It can be found that the TL dating of pottery from Nieszawa Kolonia confirms two stages of settlement. The first settlement stage is related to the phases B2-B2/C1-C1a of the Roman period, i.e. from the beginning of the 2^nd to the beginning of the 3^rd century. The second group of TL dates corresponds to the phases C2D that is to the second stage of settlement, from the second half of the 3^rd century to the half of the 5^th century AD. The results of TL dating of pottery and clay daub in the Kręcieszki site are rather similar and correspond to the phase B1/B2 of the period of Roman influence, determined from pottery style, but can also indicate the phase B2/C1.     

Child migrants and deportees from Poland and Ukraine after the Second World War: experience and memory

This article aims to compare the biographical experiences and individual memories of child deportees and migrants from Eastern Europe. The analysis is based on a field study of over 100 biographical interviews in two local communities situated in the borderland regions which were particularly exposed to post-war displacement, resettlement and population exchange: Ukrainian Galicia and Western Poland. The author claims that although the history of these two distant communities was totally different, contemporary memory of being a refugee/deportee/forced migrant, losing one's home/homeland and watching the deportation of the previous inhabitants of one's new place of residence bear many similarities. While analysing autobiographical narratives, I attempt to find common threads and topics generated by their experiences as children, as well as explain the differences by exploring the social context of individual memory, with a special accent on post-war socialisation and the Polish and Ukrainian memory culture. The author also strives to show how and why the children's memories differ from those of their parents.     

DOUBLE TRANSITIONS? REGIONAL PATTERNS OF POPULATION AGEING IN POLAND

The number and geographical distribution of the aged, and how the distribution changes over time, have captured the attention of geographical gerontologists; the complexity and spatially differentiated nature of ageing is of considerable practical and theoretical import. This article seeks to link the traditional concerns of population geography to the social and spatial relations between old people, their health and places of residence and care. It does presuppose, however, that patterns and processes at the sub‐national level are also taken into account. Therefore, the aim of the article is to identify the aged and the localities or regions where they reside, within the particular context of a Polish post‐socialist society that has recently become integrated into the European mainstream. As such it is potentially subject to a double transition, where the political and economic changes cross path with the second demographic transition. To identify interrelationships between ageing and post‐socialist transition, areas vulnerable to ageing are defined using ageing indices. Projections of the share of elderly up to 2030, based on a component cohort method, are made with a view to identifying future change in the spatial patterns of ageing. Regional patterns of ageing are presented in social, political or economic context, to show their relation to the structural changes that societies such as Poland have been passing through during the period of transition to democracy and a market economy or are likely to go through in the near future.     

Early development of late Vistulian (Weichselian) lacustrine sediments in the Żabieniec swamp (central Poland)

The early sedimentological and ecological developmental stages of a late Vistulian lake in the ?abieniec swamp near ?ód? (central Poland) were analysed by radiometric dating, changes in the frequency of specimens and species composition of Cladocera and multivariate statistical analysis (DCA). The longevity of the lake resulted in a fairly complete sedimentary record from approximately 22 ka to 11 ka cal BP. Species composition and the variability in the frequency of Cladocera specimens has made it possible to distinguish eleven zones of their development, which are well correlated with radiocarbon data. The results were compared to those from other sites of north and central Europe. The initial Cladocera development comprises the richest and oldest late Vistulian Cladocera record in Europe. These cladoceran assemblages show that a deep, oligotrophic, moderately cold-water lake was present at the beginning. It appears that the cladoceran development was mainly due to climate change, but also to changes in locally prevailing conditions in the water body. The high frequency of cladocerans, as well as the presence of cladoceran taxa preferring warmer water, was noted before approximately 16 ka BP. The biota suggests that the Oldest Dryas cooling was not severe and fairly variable in terms of humidity and temperature. The changes in Cladocera composition give evidence of what is described as the Intra-Bølling Cold Oscillation. It is also concluded that the Bølling is represented by two phases in the ?abieniec lake sediments.