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Articles containing the keyword 'ortstein'

Category: Article

article id 7083, category Article
V. T. Aaltonen. (1923). Experiments on clarification of protective action of watery humus extracts. Acta Forestalia Fennica vol. 25 no. 8 article id 7083. https://doi.org/10.14214/aff.7083
Keywords: soil; humus; experiments; protective action; hard pan
Abstract | View details | Full text in PDF | Author Info

The article deals with laboratory experiments of humus containing soil samples that were tested for leaching of iron and lime. The humus and soil samples were collected in five different areas in Silesian state forests, Germany.

The chemical content of the extracts was measured in the beginning of the test. The flocculation experiments and experiments in glass tubes took place. The stronger or weaker the podsolization, the greater or smaller was the protective action of hums at the respective place. However, more research is needed. The results of the glass tube experiments seem to indicate that with humus there were smaller amounts of Ca and Fe leaching than with merely water. 

  • Aaltonen, E-mail: va@mm.unknown (email)
article id 7047, category Article
O. J. Lukkala. (1920). Lisä ortsteinikysymyksen valaisemiseksi. Acta Forestalia Fennica vol. 16 no. 5 article id 7047. https://doi.org/10.14214/aff.7047
English title: Studies on the effect of ortstein on paludification.
Original keywords: soistuminen; podsoli; ortstein
English keywords: paludification; podzol; ortstein
Abstract | View details | Full text in PDF | Author Info

No agreement has yet been reached about formation of podzols, and their distribution in Finland has not been studied. It is, however, known that most of the forest soils are leached. The compacted ortstein is relatively rare in Southern Finland, but common in the gravely soils in Lapland. This study focuses on whether ortstein formations facilitate paludification. The study is based on observations in drained peatlands in Toivakka and Multia. Ortstein can rarely be found under the actual peatlands. It is often formed in mineral soil threshold areas, where it can be up to one meter thick. The ortstein formation was stronger in poorer soil types. Also, it is compacted into a harder layer in gravely soils than in sandy soil. These formations seem to be caused by humus-rich water flowing from the peatlands.

The soil is not leached, and ortstein is not formed in wet, low-lying peatlands, and has, therefore, no role in their paludification. In drier peatlands, especially in slopes, an A horizon can be found. However, ortstein seems not to have a marked effect on paludification. When ortstein is formed in mineral soil threshold areas, their formation seems to be caused by water flow from the peatland. It may make the threshold area more compact, and thus further facilitate paludification.

The PDF includes a summary in German.

  • Lukkala, E-mail: ol@mm.unknown (email)

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