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Biology and Fertility of Soils

, Volume 9, Issue 3, pp 205–210 | Cite as

Effects of acidification and liming on feeding groups of nematodes in coniferous forest soils

  • R. Hyvönen
  • T. Persson
Article

Summary

Nematodes were sampled in untreated, acidified, and limed plots in a Norway spruce (Fexboda) and a Scots pine (Norrliden) stand. At Fexboda, the total number of nematodes was significantly reduced after the acidification. This reduction was probably due to a shock effect, because the samples were taken only 5 months after an application of 200 kg H2SO4 ha-1 to the forest floor. However, the root/fungal-feeding Aphelenchoides was not reduced, probably because it is more tolerant of high acid concentrations than most other nematodes. At Norrliden, where the samples were taken 7 years after the last application of H2SO4, no significant differences were found between the acidified and untreated plots. If the treatment with H2SO4 caused similar effects as at Fexboda, the results indicate a recovery of the nematode populations. Decreased predation from lumbricids rather than a recovery of microfloral populations probably allowed this recovery. No marked effect of lime, spread 2 (Fexboda) and 12 years (Norrliden) before the sampling on the numbers of any of the nematode feeding groups was found. This correlated with almost no change in bacterial biomass after liming, while the active fraction of fungal hyphae was unaffected by liming at Fexboda and reduced by liming at Norrliden. A tendency for decreasing numbers of all nematode feeding groups in the limed plots at Norrliden coincided with increasing numbers of lumbricids.

Key words

Acidification Aphelenchoides Bacterial biomass Liming Nematoda Picea abies Pinus sylvestris Soil fungi 

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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • R. Hyvönen
    • 1
  • T. Persson
    • 1
  1. 1.Department of Ecology and Environmental ResearchSwedish University of Agricultural SciencesUppsalaSweden

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