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- Backéus, Ingvar
(författare)
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Bog vegetation re-Mapped after sixty years : Studies on Skagershultamossen, central Sweden
- 1972
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Ingår i: Oikos. - : JSTOR. - 0030-1299 .- 1600-0706. ; 23:3, s. 384-393
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Tidskriftsartikel (refereegranskat)abstract
- The author has re-mapped two areas on Skagershultamossen. The new maps have been compared with maps of the same areas from 1910, made by L. von Post. The vegetation changes are small. The open water surfaces have diminished in number and extent. The theory of cyclic succession on peat bogs finds no support from the maps. Plant communities have been delimited as to correspond to those on the old maps and defined through analysis of a number of sample plots
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- Bååth, Erland, et al.
(författare)
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Effect of nitrogen and carbon supply on the development of soil organism populations and pine seedlings - microcosm experiment
- 1978
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Ingår i: Oikos. - 1600-0706. ; 31:2, s. 153-163
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Tidskriftsartikel (refereegranskat)abstract
- Series of pots containing Scots pine seedlings and a humus-sand mixture were watered twice weekly for 398 d with different nutrient solutions (control treatment with complete plant nutrient solution less nitrogen; glucose addition; nitrogen addition; glucose and nitrogen addition). Analyses were made of organic and nitrogen contents in the substrate, plant weights and nitrogen contents, nitrogen fixation and respiration rates, abundance, biomass and in some cases species composition of different soil organism populations. The growth rate of pine seedlings was lowest in series supplied with glucose, which is most easily explained by a deficiency of nitrogen due to microbial immobilization. The fungi and yeast were stimulated by addition of an easily available carbon source whereas the bacteria needed both nitrogen and carbon to maintain high biomass. A positive correlation between fungal feeding soil organisms and amount of fungal mycelium was found while a more complex situation prevailed with regard to bacterial numbers and bacterial feeding nematodes. The systems are evaluated in relation to the different treatments and compared with the field situation.
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- Bååth, Erland, et al.
(författare)
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Significance of hyphal diameter in calculation of fungal bio-volume
- 1979
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Ingår i: Oikos. - 1600-0706. ; 33:1, s. 11-14
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Tidskriftsartikel (refereegranskat)abstract
- Three ways to calculate average hyphal cross section in agarfilm slides were compared in a field study including 5 soil horizons sampled 4 times. The method of calculation strongly affected the estimated value for soil fungal biovolume. Biovolume estimated with the different methods varied by more than 30%. Great differences in average cross section were found between the soil horizons, stressing the importance of using proper field measurements for biovolume estimations. The average cross section did not vary significantly between the sampling occasions in identical soil layers.
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- Henriksson,, Lars Eric, et al.
(författare)
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Determination of the Nitrogen-Fixing Capacity of Algae in Soil
- 1972
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Ingår i: Oikos. - : JSTOR. - 0030-1299 .- 1600-0706. ; 23:3, s. 420-423
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Tidskriftsartikel (refereegranskat)abstract
- A method to determine the potential of microbial nitrogen fixation in soils under aerobic conditions is described. Four different soil types were studied; loess, lime, mull and calcareous soil. The soil samples were collected in three different areas in Europe.
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- Pejler, Birgit
(författare)
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Rotifer Plankton in Brackish and Freshwater Localities in Central Sweden
- 1972
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Ingår i: Oikos. - : JSTOR. - 0030-1299 .- 1600-0706. ; 23:3, s. 416-419
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Tidskriftsartikel (refereegranskat)abstract
- The rotifer plankton was studied in some freshwater and brackish water localities in easternmost Central Sweden. Concerning the general character and rotifer plankton, some of the lakes agreed with the type previously studied e.g. on the island of Gotland and designated as "oligotrophic - highly calcareous". Some of the lakes were recently separated from the sea, and in some others brackish water still intrudes at times. In such localities Synchaeta gyrina Hood was abundant. This rotifer evidently constitutes an edge species between brackish and fresh water. In the purely brackish localities, on the other hand, the species composition was similar to that found elsewhere in Baltic zooplankton.
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