Click "Back" on your browser to return to abstracts listings for ICOMs.
The ectomycorrhizal flora of primary and secondary stands of
Pinus sylvestris in relation to soil conditions and
ectomycorrhizal succession
talk or poster
Biodiversity and Ecology
BAAR, JACQUELINE
Biological Station of the Wageningen Agricultural University,
Kampsweg 27, 9418 PD Wijster, The Netherlands
Present address: Department of Zoology and Physiology,
University of Wyoming, Laramie, Wyoming 82071-3166, U.S.A.
ICOM1 Abstract
Ectomycorrhizal species composition and sporocarp abundance
in two 15-20-year-old primary stands of Pinus sylvestris in
the central part of The Netherlands were compared with those
in two 16- and 27-year-old seconda-ry stands of P. sylvestris
in the northeastern part of The Nether-lands. The trees of the
primary stands were spontaneously seeded in a drift sand
area. Only thin (< 4 cm) litter and humus layers were
present. The trees of the 16-year-old secondary stand were
planted on podsolic sandy soil and those of the 27-year-old
stand on non-podsolic sandy soil. In both secondary stands,
thick (4-10 cm) litter and humus layers had been developed.
The litter and humus partly originated from former stands at
the same sites, partly from the present stands. In the
secondary stands, the thick litter and humus layers and
understory vegetation were remo-ved ("sod-cutting") in order
to simulate the thin litter and humus layers in the primary
stands. Untreated plots served as controls. Surveys conducted
in 1991, 1992 and 1993 indicated that sod-cut-ting enhanced
abundance and diversity of ectomy-corrhizal fungi; however,
the species richness and diversity in the sod-cut plots did
not reach those in the prima-ry stand plots. High species
richness and diversity were associated with low
concentrations of nitrogen and relatively high pH values in
the litter and humus layers and mineral soil. These results
suggest that sod-cutting may be beneficial in restoring
ectomycorrhizal flora in Scots pine stands.