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[Text] = Studier over kvavemobiliseringen i skogsjord : научное издание / C.O. Tamm, A. Pettersson. - Stockholm : Skogshogskolan, 1969. - 39 p. : рис., табл. - (Studia Forestalia Suecica, ISSN 0039-3150 ; № 75). - eng. - Библиогр.: с. 25-26. - 0.50 р.

УДК

06

Аннотация: Incubation experiments were perfomed on samples from horizons of middle Swedish podzol profiles, stored under aerobic conditions at room temperature for up to two and a half years. More than one-third of the organic matter in the mor sample from a good site disapeared during two years' incubation at room temperture. Twenty-four to twenty-six per cent of its nitrogen content was simultaneously mineralised, the largest part as ammonia. The loss of organic matter was somewhat lower in samples from three poor sites (between 20 and 30 per cent) and the release of nitrogen was also lower (12 to 17 per cent). Both the breakdown and the release of nitrogen were generally decreased nitrogen lelease in mor samples (often to nil) but increased release in B horizon samples. Liming also increased nitrate formation


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Pettersson, A.
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[Text] / M. Olsson. - Uppsala : The Swedish University of Agricultural Sciences, College of Forestry, 1983. - 14 p. : рис., табл. - (Studia Forestalia Suecica, ISSN 0039-3150 ; № 164). - eng. - Библиогр.: с. 13-14. - ISBN 91-576-1398-2 : 0.50 р.

УДК

06

Аннотация: Morphological studies of mor of different ages were carried out with the purposes of describing and elucidating biological activity on the basis of morphological properties, and deducing the rate of genesis. This site was characterized by a quartz-rich sand deposit, low ground-water table, poor vegetation and orthic podzol. In the morphological analyses the mor was separated into different horizons. Micromorphological studies showed that fungi were very important in the decomposition process. Soil animals were of less significance. The formation of the fermentation horizon was a fast process. After a period of 20 years a ferminatation horizon had developed although it was characterized by a low content of altered organic matter. The formation of a humus-substance horizon was a much slower process.

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