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Effects of air pollution and forest regeneration methods on the community structure of ectomycorrhizal fungi

Kårén, Ola (1997). Effects of air pollution and forest regeneration methods on the community structure of ectomycorrhizal fungi. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae. Silvestria, 1401-6230 ; 33
ISBN 91-576-5317-8
[Doctoral thesis]

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This thesis describes the ectomycorrhizal community and how it is affected by nitrogen
fertilization and forest regeneration methods. Fertilizer treatments included ammonium
sulphate (NS), lime +P+K+Ca+Mg+S (N-free) and ammonium nitrate, applied in spruce
(Picea abies) stands in south Sweden and a pine (Pinus sylvestris) stand in north Sweden.
None of the fertilizers decreased the proportion of short-roots colonized by
ectomycorrhizal fungi. Estimations of fungal biomass of short-roots in NS and N-free
treatments confirmed this. These results contrast with the 60-100% decreases in sporocarp
production of ectomycorrhizal fungi reported by other investigators. Molecular methods
were used to identify ectomycorrhizal fungi on short-roots after testing their applicability
in a separate study. N fertilization had a pronounced effect on the species composition on
mycorrhizal roots. The decreased sporocarp production of ectomycorrhizal fungi was
suggested to depend on a decreased abundance of species sensitive to N, decreased total
allocation of carbohydrates to the fungi, and a changed carbohydrate allocation within the

A second study investigated the community structure of ectomycorrhizal fungi in 11
pine stands in central Sweden. Three stands ("O") consisted of 150-year-old, unmanaged
forests, and the remaining were 30-40 years old. Of the latter, four were the result of
regeneration by planting on clear-cuts ("P"), and four developed under shelterwood trees
that were successively removed ("S"). Mycorrhizal roots, sampled in 1995 and sporocarps
(in 1995-96) were identified. The number of species found as mycorrhizas or as
sporocarps was lowest in P, whereas species richness was similar in S and O. The species
compositions of mycorrhizas or sporocarps were least similar between P and O, but more
similar between S and O. Between 45-90% of the mycorrhizas were formed by species not
observed in the sporocarp inventory. Multivariate analyses indicated that species
composition of ectomycorrhizal fungi was correlated with the age of the forest, soil factors
which were partly correlated with age and to some extent also type of regeneration

It is suggested that nitrogen deposition and N-fertilization reduce the diversity of
ectomycorrhizal fungi. Effects of forest regeneration methods appear less pronounced, but
fungi restricted to old forests may need protection.

Authors/Creators:Kårén, Ola
Title:Effects of air pollution and forest regeneration methods on the community structure of ectomycorrhizal fungi
Series Name/Journal:Acta Universitatis Agriculturae Sueciae. Silvestria
Year of publishing :1997
Depositing date:2015
Number of Pages:53
IKårén O., Högberg N., Dahlberg A., Jonsson L. and Nylund J.-E. 1997. Inter- and intraspecific variation in the ITS region of rDNA of ectomycorrhizal fungi in Fennoscandia as detected by endonuclease analysis. The New Phytologist 136 (2): 000-000.
IIKårén, O., and Nylund, J.E. 1996. Effects of N-free fertilization on ectomycorrhiza community structure in Norway spruce stands in southern Sweden. Plant and Soil. 181: 295-305.
IIIKårén O. and Nylund J.-E. Effects of ammonium sulphate on the community structure and biomass of ectomycorrhizal fungi in a Norway spruce stand in SouthWest Sweden. Canadian Journal of Botany, in press.
IVKårén O., Jonsson M., and Nylund J.-E. Community structure of ectomycorrhizal fungi in young, managed and old, unmanaged Pinus sylvestris forests. Manuscript.
Place of Publication:Uppsala
Publisher:Department of Forest Mycology and Pathology, Swedish University of Agricultural Sciences
ISBN for printed version:91-576-5317-8
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:K Forestry > K10 Forestry production
P Natural resources > P34 Soil biology
T Pollution > T01 Pollution
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Agrovoc terms:pinus sylvestris, picea abies, forest trees, forest soils, mycorrhizae, biodiversity, ribosomal rna, pcr, rflp, identification, air pollution, nitrogen fertilizers, fertilizer application, artificial regeneration
Keywords:ectomycorrhiza, diversity, nitrogen, pollution, management, regeneration, ribosomal DNA, PCR, RFLP, identification
Permanent URL:
ID Code:12835
Faculty:S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Forest Mycology and Plant Pathology
(S) > Dept. of Forest Mycology and Plant Pathology
Deposited By: Gunilla Åkerlund
Deposited On:20 Nov 2015 07:13
Metadata Last Modified:10 Sep 2020 13:41

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