Pologne | EPFL Graph Search

La Pologne, en forme longue république de Pologne (Polska ; [forme longue] Rzeczpospolita Polska), est un État d'Europe centrale, frontalier avec l'Allemagne à l'ouest, la Tchéquie au sud-ouest, la Slovaquie au sud, l'Ukraine à l'est-sud-est et la Biélorussie à l'est-nord-est, et enfin l'enclave russe de Kaliningrad et la Lituanie au nord-est. Par sa population de d'habitants au début des années 2020, la Pologne est le trente-huitième pays le plus peuplé au monde. Elle est divisée en voïvodies, elles-mêmes subdivisées en districts (powiat) puis en communes (gmina). C'est une république parlementaire qui a pour monnaie nationale le złoty. Elle est membre de l'Union européenne depuis le , du Conseil de l'Europe, du groupe de Visegrád, de l'Organisation mondiale du commerce et de l'Organisation des Nations unies. De nombreux historiens situent la formation de la Pologne en 966, par . Le royaume de Pologne est fondé en 1025. Il est régi par un roi et une diète. En 1569, une association

Multiproxy evidence of Little Ice Age palaeoenvironmental changes in a peat bog from northern Poland

Mariusz Lamentowicz

‘Little Ice Age’ (LIA) climatic deteriorations have been abundantly documented in various archives such as ice, lake sediments and peat bog deposits. Palaeoecological analyses of peat samples have identified these climatic deteriorations using a range of techniques, for example palynology, plant macrofossils, testate amoebae or carbon isotopic analyses. The use of inorganic geochemistry and the reconstruction of dust fluxes has remained a challenge in tracing the nature of LIA climatic changes. Although the idea of enhanced erosion conditions and storminess is commonly discussed, the conditions for dust deposition in peatlands over Europe during the LIA are rarely favourable, because the natural forest cover over Europe was much more important than nowadays, preventing dust deposition. This intense forest canopy masks the deposition of dust in peatlands. In northern Poland, near the Baltic shore, the Słowin´skie Błota area was deforested around AD 1100, ie, just before the LIA, and therefore constitutes a key area for the reconstruction of LIA climatic change. With the support of a well-constrained chronology, climatic fluctuations are recorded in an ombrotrophic bog using inorganic geochemistry, plant macrofossils and carbon isotopic analyses. The reconstruction of LIA climatic changes is in good agreement with other records from Poland and NE Europe. However, a c. 50-year discrepancy can be observed between various records. This discrepancy is possibly due to progressive time-dependent cooling gradient from north to south Europe.

2009

Multiproxy study of anthropogenic and climatic changes in the last two millennia from a small mire in central Poland

Mariusz Lamentowicz

The Żabieniec kettle-hole is the first peatland in central Poland analysed quantitatively with four biotic proxies (plant macrofossils, pollen, testate amoebae and chironomids) in order to reconstruct past environmental change. Palaeoecological data were supported by historical and archaeological records. We focused on autogenic vegetation change and human impact in relation to climatic effects. The aims of our study were: (a) to describe the development history of the mire during the last 2000 years, (b) to date and reconstruct the anthropogenic land-use changes, and (c) to discuss a possible climatic signal in the peat archive. The combination of proxies revealed dramatic shifts that took place in the peatland since the Roman Period. Żabieniec was a very wet telmatic habitat until ca AD 600. Then the water table declined and the site transformed into a Sphagnum-dominated mire. This dry shift took place mainly during the Early Medieval Period. Human impact was gradually increasing and it was particularly emphasized by deforestation since AD 1250 (beginning of the Late Medieval Period). Consequently, surface run-off and aeolian transport from the exposed soils caused the eutrophication of the mire. Furthermore, chironomids and testate amoebae reveal the beginning of a wet shift ca AD 1350. Openness considerably increased in the Late Medieval and the Modern Periods. The highest water table during the last 1000 years was recorded between AD 1500 and 1800. This wet event is connected with deforestation but it could be also associated with the Little Ice Age. Our study shows plant succession in the Żabieniec peatland, which can be explained with the recent landscape transformation. However, such changes are also possibly linked with the major climatic episodes during the last two millennia, such as the Medieval Warm Period and the Little Ice Age.

Springer Netherlands2009

Autogenic succession, land-use change, and climatic influences on the Holocene development of a kettle hole mire in Northern Poland

Mariusz Lamentowicz, Edward Mitchell

We reconstructed the Holocene developmental history of a kettle-hole peatland in the Tuchola forest of Northern Poland, using pollen, testate amoebae and plant macrofossils indicators. Our aims were to determine the timing and pattern of autogenic succession and natural and anthropogenic influences on the peatland. Northern Poland is under mixed oceanic and continental climatic influences but has so far been less studied in a palaeoecological context than more oceanic regions of Europe. In the first terrestrial developmental phase of the mire, the testate amoebae-inferred depth to water table revealed two major dry shifts at ca 9400 (end of lake phase) and ca. 7100 cal. BP (a period of global cooling and dry shift in western Europe). Conditions became wetter again in two steps at ca. 6700 and ca. 5800 BP after a dry event at ca. 6100 BP. The timing of the wet shift at 5800 BP corresponds to wet periods in Western Europe. Peat accumulation rates were low (0.1 mm yr-1) between ca. 5600 and ca. 3000 BP when sedges dominated the peatland. In the last 2500 years surface moisture fluctuated with wet events at ca 2750-2400, and 2000 BP, and dry events at ca. 2250-2100 and 1450 BP. After 1450 BP a trend towards wetter conditions culminated at ca. 500 cal. BP, possibly caused by local deforestation. Over the mire history, pH (inferred from testate amoebae) was mostly low (around 5) with two short-lived shifts to alkaline conditions (7.5) at ca. 6100 and 1450 BP indicating a minerotrophic influence from surface runoff into the mire. Up to about 1000 BP the ecological shifts inferred from the three proxies agree with paleoclimatic records from Poland and Western Europe. After this date, however correlation is less clear suggesting an increasing local anthropogenic impact on the mire. This study confirms that kettle-hole peatlands can yield useful palaeo-environmental data as well as recording land-use change and calls for more comparable studies in regions are the interface between major climate influences.

2008

Multiproxy study of anthropogenic and climatic changes in the last two millennia from a small mire in central Poland

Mariusz Lamentowicz

Springer Netherlands2009

Autogenic succession, land-use change, and climatic influences on the Holocene development of a kettle hole mire in Northern Poland

Mariusz Lamentowicz, Edward Mitchell

2008