Search

Your search keyword '"NIEDZIELSKI, PRZEMYSŁAW"' showing total 559 results
Start Over Author "NIEDZIELSKI, PRZEMYSŁAW"
559 results on '"NIEDZIELSKI, PRZEMYSŁAW"'

40. The late Holocene decline of Trapa natans L. in Northern Poland in the light of new palaeobotanical and geochemical data

Author

Lewandowska Agnieszka, Niedzielski Przemysław, and Gałka Mariusz

Subjects
water chestnut, plant macrofossils, palaeoecology, geochemical sediment analysis, Physical geography, GB3-5030, Environmental engineering, TA170-171, Technology
Abstract

Trapa natans (water chestnut) is an aquatic, thermophilic plant whose decline has been observed in many localities in central Europe during the last decades. In this paper, we present a description of two new T. natans subfossil sites located outside its present northern distribution in Poland. High-resolution analysis of plant macrofossils supported by geochemical analysis were undertaken to reconstruct the palaeoecological habitat and examine the cause of the late Holocene decline of T. natans that took place ca. 4000 calibrated years before AD 1950 (cal. yr BP) in a paleolake, presently the Bagno Kusowo bog. Its disappearance was a consequence of terrestrialisation and the development of peatland. In paleolake sediments covered by the peat layer in the Mechacz Wielki bog, T. natans macrofossils were found from before ca. 3300 cal. yr BP. The decline of T. natans could have resulted from the changes and development of other plant communities where the dominant role was played by Stratiotes aloides and Nymphaea sp. In our study sites, T. natans occurred together with Potamogeton crispus, Potamogeton obtusifolius, Nymphaea alba, and Nuphar sp. in eutrophic water dominated by Ca2+, Fe3+, and Al3+ ions. Our palaeobotanical and geochemical results align with the contemporary conditions of T. natans habitat.

Published
2019
Full Text
View/download PDF

47. The influence of urban agglomeration on a small natural water reservoir

Author

Sobczyński Tadeusz and Niedzielski Przemysław

Subjects
small lake, urban agglomeration, anthropopression, Physical geography, GB3-5030, Environmental engineering, TA170-171, Technology
Abstract

The aim of the study was to determine the influence of urban agglomeration on a small, natural water reservoir which, as a result of the expansion of the city of Poznań, has become an urban lake. In the vegetation period 2015, the chemistry of its water was studied, and in September additional samples of bottom sediments, plants and fish were collected for analysis in order to determine the content of heavy metals. In terms of productivity, no significant influence of the catchment was recorded. In the 1980s the lake was defined as eutrophic, and in 1996 as α-mesotrophic and such a state continues until today. This is the result of protective activity undertaken by its new owner. The adverse influence of the urbanization of the surrounding areas was reflected by the increased content of lead in particular elements of this ecosystem, that is, in bottom sediments, plants and fish muscles.

Published
2018
Full Text
View/download PDF

48. Geochemistry and mineralogy of technogenic soils developed on old mine heaps of abandoned iron ore mines in the Ławęczna area (Holy Cross Mountains, south-central Poland)

Author

Swęd Maciej and Niedzielski Przemysław

Subjects
Geochemical background, technogenic soils, old mine heaps, geochemical anomaly, Agriculture
Abstract

The article presents the results of preliminary geochemical and mineralogical studies of technogenic soils (Technosols) of abandoned iron ore mines on the Ławęczna Hill near Miedziana Góra in the Holy Cross (Świętokrzyskie) Mountains, southcentral Poland. The results of chemical analyses (XRF) were used to calculate the soil enrichment factors of arsenic, copper, iron, lead and zinc, and compare the element concentrations to their levels in uncontaminated soils across Poland and in the city of Kielce. The highest values of soil enrichment factors of metals (As 27.699, Ni 26.455, Cu 9.353, Zn 3.344, Pb 0.62) were recorded for the sand fraction composed of iron oxyhydroxides and hematite, whereas the lowest (Ni 0.22, Cu 0.069, Zn 0.007, Pb 0.028) for the clay–silt and sand fractions, which were primarily composed of calcite and quartz as well as for gravel fraction. The clay-silt fraction shows the highest enrichment in arsenic (27.69). The examined metals and arsenic show positive geochemical anomalies.

Published
2018
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results