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1

The solubility of iron in forest soils

100%
Gruba P.
Electronic Journal of Polish Agricultural Universities. Series: Forestry
|
2010
|
tom 13
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nr 4
2

Influence of the pedogenic process of humus accumulation on the physical and chemical transformation of quartz grain surfaces

100%
Chojnicki J., Zagajewski A.
Polish Journal of Soil Science
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2010
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tom 43
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nr 2
The pedogenic process of humus accumulation causes stronger and more diverse chemical rather than physical transformations of quartz grain surfaces. Chemical weathering of quartz grain surfaces in the humus horizon results in etching and corrosion over oncrusting and encrusting; an opposite situation is observed in the parent rock and the underlying rocks. Etchings and corrosion pits in the humus horizon were formed in the pedogenic process of humus accumulation, whereas oncrustings and encrustings in the parent rock and the underlying rocks are of geological origin. Microchemical analysis (EDS) indicated the highest total content of Si, Ca, Al and Fe in the oncrustings and encrustings on quartz grains.
3
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Content available

Heavy metals in the forest soils of the South Podlasie Lowland

100%
Raczuk J.
Acta Agrophysica
|
2001
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tom 51
Concentration and profile distribution of heavy metals was investigated as contamination indicators of the forest soils formed from glacial deposits of the South Podlasie Lowland. The study was carried out on thirteen soil profiles situated a hundred meters from the road. The highest content of heavy metals was found in the organic horizons of the investigated soils. The mean content of Mn, Zn, Cu, Pb, Ni, Cr in the investigated soils were: 556.7, 72.9,15.5, 63.5,13.8, 16.5 mg/kg d.m. of the soil, respectively. In the mineral-organic and mineral horizons of the investigated soils heavy metals were present in quantities which were close to natural. The podzol soils, podzols and rusty soils developed from sands contain less heavy metals than the soils lessivés, black earth and deluvial soil. The Mn, Zn, Cu, Pb distribution in the soil profiles is influenced by the soil forming processes. The distribution index of the examined metals distribution in the genetic horizons testify to it.
4

Rozmieszczenie form zelaza w glebach plowych jako wskaznik procesu glebotworczego

80%
Jaworska H., Kobierski M.
Roczniki Państwowego Zakładu Higieny
|
2004
|
tom 55
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nr Supl.
113-117
Na podstawie profilowego rozmieszczenia form żelaza określono wskaźniki pedo- i litogenezy dla niecałkowitych gleb płowych z Pojezierza Dobrzyńskiego.
5
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Strange tadpoles from the lower Miocene of Turkey: Is paedogenesis possible in anurans?

80%
Dubois A., Grosjean S., Paicheler J.-C.
Acta Palaeontologica Polonica
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2010
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tom 55
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nr 1
Fossil material from the lower Miocene collected in the basin lake of Beşkonak (Turkey) included 19 slabs showing 19 amphibian anuran tadpoles of rather large size, at Gosner stages 36–38. These well preserved specimens show many morphological and skeletal characters. They are here tentatively referred to the genus Pelobates. Two of these tadpoles show an unusual group of black roundish spots in the abdominal region, and a third similar group of spots is present in another slab but we were unable to state if it was associated with a tadpole or not. Several hypotheses can be proposed to account for these structures: artefacts; intestinal content (seeds; inert, bacterial or fungal aggregations; eggs); internal or external parasites; diseases; eggs produced by the tadpole. The latter hypothesis is discussed in detail and is shown to be unlikely for several reasons. However, in the improbable case where these spots would correspond to eggs, this would be the first reported case of natural paedogenesis in anurans, a phenomenon which has been so far considered impossible mostly for anatomical reasons (e.g., absence of space in the abdominal cavity).
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