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SUMMARY
Frost heaving is a major problem
in afforestation in Iceland. This
problems has grown in recent
years as planting on eroded
areas and harrowed/ploughed
land has increased. Field experi-
ments were established to study
the effect of various methods to
prevent frost heaving of Siberian
larch and birch seedlings in
southern Iceland in 1995. The
experimental fields were harrow-
ed by a TTS-rotator 1-2 years
before planting, leaving 20-30
cm deep furrows. The seedlings
were planted in the middle of the
furrow.
Four treatments were tried,
a) control, b) mulching with
gravel, c) application of fertilizer
(22 g/plant) and d) application of
oat seed (12 g) and fertilizer
(22 g/plant).
Over 60% of control plants
were more or less affected by
frost heaving in the first two
winters. Frost heaving of plants
treated with fertilizer application
or by mulching with gravel was
considerable (35-40% of plants),
but frost heaving of plants treat-
ed with oat seed and fertilizer
was negligible (below 3%).
Mortality of plants treated with
oat seed and fertilizer was how-
ever significant (62% survival
after two years), especially in the
first year. This was due to compe-
tition from the oats and drying
out of plants caused by fertilizer
application.
Survival was better in other treat-
ments (72-78%), but a significant
proportion of plants in these
treatments had seriously reduced
vitality caused by frost heaving. it
is therefore concluded that appli-
cation of seed and fertilizer is a
promising method to reduce
frost heaving in afforestation in
lceland.
ARINHLEÐSLA
MÚRVIÐGERÐIR
GLERVEGGJAHLEÐSLA
FLÍSALAGNIR
SlGURBJÖRN E.
LOGASON
MÚRARAMEISTARI
FANNAFOLD66A
SÍMI 567-6245
V J
GÆÐAMOLD
MOLDARBLANDAN - GÆÐAMOLD HF.
Pöntunarsími 67 49 88
GÆÐAMOLD
í GARÐINN
Grjóthreinsuð mold,
blönduð áburði,
skeljakalki og sandi.
Þú sækir eða
við sendum.
Afgreiðsla á gömlu
sorphaugunum
í Gufunesi.
SKÓGRÆKTARRITIÐ 1998
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