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Sytuacja osób niepełnosprawnych na polskim rynku pracy i jej determinanty

Bąba W.

Bezpieczeństwo Pracy : nauka i praktyka

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2018

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nr 10

6-8

PL

Celem artykułu jest dokonanie analizy sytuacji osób z niepełnosprawnościami na polskim rynku pracy oraz identyfikacja kluczowych czynników determinujących tę sytuację. Analiza prowadzona jest w dwóch aspektach: prawnym (stan przepisów prawnych, regulujących status osób z niepełnosprawnościami na polskim rynku pracy w dniu 31 marca 2018 r.) oraz empirycznym (wartości wskaźników, mogących służyć opisowi sytuacji osób z niepełnosprawnościami na polskim rynku pracy w okresie 2007-2017). Analiza koncentruje się na populacji osób posiadających orzeczenie o niepełnosprawności do celów związanych z zatrudnieniem, gdyż tylko takie osoby są uprawnione do specjalnego traktowania na polskim rynku pracy.

EN

This article analyses the situation of persons with disabilities on Poland's labor market and identifies key factors which determine this situation. The analysis considers two aspects: legal (legislation regulating the status of persons with disabilities on Poland's labor market as of March 31,2018) and empirical (values of indicators, which could be used to describe the situation of persons with disabilities on Polish labor market in 2007-2017). The analysis focuses on the population of persons with an employment-related disability certificate, since only such persons are entitled to special treatment on Polish labor market.

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The influence of standing vegetation height on the reproductive allocation In populations of Serratula tinctoria L. (Asteraceae)

Kostrakiewicz-Gierałt K., Bąba W.

Polish Journal of Ecology

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2014

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Vol. 62, nr 1

89--99

EN

The advantage of the clonal plants over the nonclonal species in colonization of all biomes and biogeographical regions primarily is due to occurrence of two modes of reproduction. The creating of vegetative propagules with high vitality and survivability, enables the spread in the newly colonized site, while seed production increases the chances for successful recruitment of seedlings, ensuring the genetic diversity of the population. The differences in allocation into vegetative reproduction and generative propagation in relation to rising height of adjacent plants was investigated in populations of Serratula tinctoria L., occurring in Molinietum caeruleae meadows localized in Southern Poland. Each locality was represented by randomly established three permanent study plots: dominated by small meadow species (LOW), prevailed by large-tussock grasses (INTER) and overgrown by shrubs and trees (HIGH). In the years 2009–2011 the number of leaf rosettes and length of the longest leaf in rosette (as a measure of allocation in vegetative propagation), as well as height of generative stems, number of capitula per stem and number of seeds per capitulum (as indicators of investment in generative reproduction) were observed. The allocation in vegetative reproduction decreased along the gradient of vegetation height. The gradually decline of number of rosettes might be caused by lack of free space suitable for establishment of new ramets, whereas the small leaf size could be due to drastically augmentation of shading. The allocation in generative reproduction increased along the gradient of vegetation height. The placement of structures necessary for generative propagation in higher layers of herbaceous canopy, as well as considerable number of capitula and seed production might increase the chances for successful recruitment of seedlings. On the basis of obtained results combining with published data it should be assumed, that the substantial allocation in vegetative reproduction and the slight investment in generative propagation seems to be sufficient for persistence of Serratula tinctoria populations in patches dominated by small meadow species, while the considerable allocation in generative reproduction could be crucial for maintenance of population viability under competitive conditions.

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The spontaneous succession in a sand-pit: the role of life history traits and species habitat preferences

Kompała-Bąba A., Bąba W.

Polish Journal of Ecology

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2013

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Vol. 61, nr 1

13--22

EN

The prediction of species response to human activity is of great interest in contemporary restoration ecology. The purpose of the article was to analyse which species life history traits and species habitat preferences are important during succession after the abandonment of mining activity in a sand-pit. During a 15-year period (1996–2010), 176 phytosociological relevés were placed within vegetation patches of different ages and divided according to soil moisture, thus forming two series of chronosequences that ranged from 0 to ca. 50 years. The datasets were analysed using both DCA/CCA ordinations and regression trees. The successional gradient, apart from the theoretically predicted replacement R by C strategists, revealed the occurrence of stresstolerant ruderals and competitive ruderals in the early successional stages. However, differences were observed between the wet and dry series. On dry soils the ruderals, anemochorous and windpollinated species dominated in the early phases. In the middle successional phases, a preponderance of anemochorous species (nanophanerophytes, light or semi-shade demanding species), nitrogen-poor and competitive ruderals or species typical for nitrogen-rich soils was recorded. In the late successional stages, species with both the ability of vegetative and generative reproduction appeared. On the other hand, on wet sites in the early successional phases, species with vegetative growth, hydrophytes, chamaephytes and stresscompetitors prevailed. Later in the succession, they were replaced by insect-pollinated species in nitrogen rich habitats and stress-tolerant ruderals on less fertile habitats. Finally, competitors started to prevail. Knowledge of the environmental conditions of a given site, the ecological processes and species biology can assist in achieving the desired goals or in initiating or enhancing succession on some disturbed sites.

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Genetic diversity of populations of Brachypodium pinnatum (L.) P. Beauv. : expansive grass in a fragmented landscape

Bąba W., Kurowska M., Kompała-Bąba A., Wilczek A., Długosz J., Szarejko I.

Polish Journal of Ecology

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2012

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Vol. 60, nr 1

31-40

EN

Brachypodium pinnatum belongs to native grasses which could dramatically decrease the biodiversity of calcareous grasslands, therefore, an examination of the mechanisms of its expansion is of prime importance for their conservation. We studied the genetic structure of 12 subpopulations of the expansive grass B. pinnatum in a heterogeneous landscape with AFLP markers, aiming at determination whether spatial isolation influences the genetic diversity and the population genetic structure of this species. A high level of overall (79%) and within population polymorphic loci (38.44%) were found and 220 different genotypes were distinguished among the 252 samples analysed. No significant population structure nor isolation-bydistance were found, despite their long-time fragmentation history. This confirms that isolation of calcareous grasslands in a landscape cannot prevent the expansion of B. pinnatum grasses because of the high generative dispersal ability. Subsequent quick and extensive clonal growth of this species enables the successful establishment. In most cases mowing or grazing is sufficient to keep this species at a low density within ancient grasslands and to prevent seed and pollen dispersal, but not for restoration of species-rich calcareous grasslands.

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Forest communities in the Kuźnica Warężyńska sand-pit

Kompała-Bąba A., Błońska A., Bąba W.

Zeszyty Naukowe. Inżynieria Środowiska / Uniwersytet Zielonogórski

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2004

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nr 131(12)

197-204

EN

The forest communities, which developed on the reclaimed areas of the Kuźnica Warężyńska sand-pit (Silesian Upland), approximate in reference to floristic composition Querco roboris-Pinetum. It occurs from 14 to 45 species in patches. The participation of character species of the Vaccinio-Piceetea class is relatively low and species from other phytosociological units such as Molinio-Arrhenatheretea class appear more frequently and abundantly. The phytocoenoses show significant differentiation which reflects moisture and trophic conditions, so two subassociations were distinguished: wet Querco roboris-Pinetum molinietosum, which is distinguished by wet meadow species, peat-bog plants and rush species and drier Querco roboris-Pinetum typicum with the participation of psammophilous species of the Koelerio-Corynephoretea class. The method [Krzaklewski, 1999], including in reclamation works plant communities, which develop during natural succession, increases success for re-establishment of self-regulating ecosystems and let create mosaic of plant communities, sometimes very interesting from the scientific point of view and valuable for biodiversity conservation.

PL

Fitocenozy leśne, które wykształciły się na objętych rekultywacją obszarach piaskowni Kuźnica Warężyńska (Wyżyna Śląska) są zbliżone pod względem fitosocjologicznym do boru mieszanego Querco roboris-Pinetum. Poszczególne płaty buduje od 14 do 45 gatunków. Udział gatunków charakterystycznych klasy Vaccinio-Piceetea jest stosunkowo niewielki, natomiast większe znaczenie mają gatunki przechodzące z innych klas zbiorowisk roślinnych. Płaty wykazują zróżnicowanie odzwierciedlające panujące warunki wilgotnościowe i troficzne, dzięki czemu możliwe było wydzielenie na tym terenie dwóch podzespołów: wilgotnego Querco roboris-Pinetum molinietosum, którego fitocenozy wyróżniają gatunki wilgotnych łąk, torfowisk czy też zbiorowisk szuwarowych oraz suchszego z udziałem gatunków psammofilnych z klasy Koelerio-Corynephoretea. Zastosowana na tym terenie obok całkowitego zalesiania, metoda sukcesji kierowanej [Krzaklewski i in. 1999], włączająca do procesu rekultywacji, zbiorowiska pochodzące z naturalnej sukcesji zwiększa szanse na odtworzenie się w pełni funkcjonalnych ekosystemów oraz pozwala na wytworzenie mozaiki zbiorowisk roślinnych często interesujących i wartościowych z punktu widzenia ochrony bioróżnorodności.