Skógræktarritið - 15.05.2001, Blaðsíða 89

from the Kenai Peninsula in
Alaska and were cultivated in a
small nursery in southern
Iceland. They had reached 14 m
in height by 1963, when their
stems were killed by the unusual
spring weather (see above). Their
root suckers are now 20 m in
height. Material was obtained
from more southerly and mar-
itime locations in Alaska and
that is now mostly used in S- and
W-lceland, while the Kenai mate-
rial is used in N- and E-Iceland.
Black cottonwood was mostly
planted as garden and park trees
from the 1950's to 80’s, which
now form a large part of the
urban forests in towns such as
Akureyri and Egilsstaðir. Mass
propagation and forestry planti-
ng did not start until 1987, with
planting of 100,000-150,000
saplings annually since then. In
1999, black cottonwood com-
prised 4% of trees planted.
Black cottonwood planted in
gardens and receiving good care
can reach 20 m in height in 30
years. A forest stand of the same
age yields a mean annual incre-
ment of 15 m3/ha/yr at 1600
stems/ha. Many clonal trials have
been planted during the past
decade and clonal selection will
lead to further improvements.
References
Blöndal, Sigurður. 1993-1998.
Skógfræði. 2. Helstu trjátegundir
í skógrækt á íslandi. 69 pp.
Halldórsson, G., Sverrisson, H.,
Oddsdóttir, E.S., and Eyjólfs-
dóttir, G.G. 2001. Tree diseases.
IFRS Report 4/2001. 50 pp.
Skógræktarritið. 1998-2000. Several
papers and statistics.
Personal communication: Lárus
Heiðarsson, Ólafur Ólafsson,
Þórarinn Benedikz and Þröstur
Eysteinsson.
ARK
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fjölbreytni í skipulagi og efnisvali.
Vegleg bók, 208 síður.
Garðyrkjufélag íslands
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