Skógræktarritið - 15.05.2001, Qupperneq 168

by a large-scale approach (Bryn
2000). A one-scale study of the
a-diversity would not revealed
what was really happening and
the serious consequences for
biodiversity of the re-growth.
Prospects of re-growth in sum-
mer farm areas and tree-planta-
tion in iceland
As most summer farms are
abandoned and the grazing pres-
sure is reduced, the subalpine
birch forest is claiming ground by
succession processes. The habi-
tats for antropochores, small
alpine plants and lowland plants
are reduced by re-growth, and
the biological diversity in the
summer farm landscape is low-
ered all over Norway.
Whether forest re-growth and
tree-plantation will have the
same effect on vascular plant
diversity in iceland as in Norway
is unknown as far as we know. In
Iceland the species pool is lower
(Kristinsson 1987), the climate
more oceanic, the grazing wide-
spread and more dominated by
sheep and horses. We should,
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SKÓGRÆKTARRITIÐ 2001 l.tbl.