Skógræktarritið - 15.12.1993, Blaðsíða 36

Tafla 1.
Lerkitré valin á Hallormsstað haustiö 1992
TRÉ NR. TEGUND KVÆMI ALDUR STAÐUR
1 Rússa* Guttormsl. 15? í kletti v/Lagarfljót (724-7)
2 Rússa Arkhangelsk N 32 Norðan við Guðrúnarlund (710-9)
3 Rússa Ark. Pinega 26 Ljósárkinn ofarlega (804-3)
4 Rússa Raivola 36 Atlavíkurstekkur (714-3)
5 Síberíu Altai 14 Sólheimar
6 Rússa Karpinsk 31 Partur (304-8)
7 Síberíu Sjebalinskí 36 Atlavíkurstekkur (714-3)
8 Sifja Blairwood 33 Stórhóll (718-4)
9 Rússa Mustila 27 Framhólar (505)
10 Evrópu Graubunden 30 Framhólar (509-15)
11 Fjalla Larch Valley 23 Mörkin
12 Rússa Hausjárvi 10 Sunnan við Freyshóla (505-1)
13 Rússa Arkhangelsk 27 Freyshólar sunnar, ofar
14 Rússa Arkhangelsk 27 Freyshólar norðar, neðar
15 Rússa Plesetsk 8 Melur, Mjóanesi
16 Rússa Arkhangelsk 55 Guttormslundur neðarlega (724-5)
17 Síberíu Ulan Udensk 10 Sunnan við Freyshóla (207-2)
18 Rússa MoDo 17 Neðan við veg v/klett (201)
19 Rússa Guðrúnarl. 11 Við Hafursá (218-3)
20 (a-j) Rússa Imatra 3 Vaglir
* Rússa = Larix sibiríca (sukaczewii) / Síberíu = Laríx sibiríca (sibiríca) / Sifja = Laríx x eurolepis / Evrópu = Larix decidua / Fjalla = Larix lyallii
SUMMARY
Siberian larch (Larixsibirica
Ledeb.) is of interest as a poten-
tial commercial tree species in
Iceland. Provenances from the
Archangelsk district of Russia,
which we call Russian larch, are
better adapted to lcelandic con-
ditions and superior in form to
provenances tested from the
Altai region. However, seed of
the preferred provenances has
been difficult to obtain from
Russia and seed from Finnish
and Swedish seed orchards is
very expensive and also not
always available. Larch seldom
produces seed in Iceland, and
when it does, germination is very
poor.
An accelerated breeding pro-
gram for larch is under way, with
the aim of developing a well
adapted land race for Iceland
with good growth and form
traits. Twenty plus trees have
been selected and scions from
them grafted onto rootstock in
a greenhouse. Between 100 and
200 more trees will be selected
within the next 2-3 years. The
potted grafts will be grown at an
accelerated rate in a greenhouse.
Flower stimulation treatments
will commence 3-4 years from
grafting, including application of
the plant growth regulator gib-
berellin (GA4/7), root pruning
and drought. As many full-sib
families as possible will be
generated through controlled
pollination in the greenhouse.
Progeny tests will be planted in
2 or 3 Iocations and their results
used to select a seed production
population from among the
parents. Second generation se-
lections can be made from the
progeny tests when they are 10-
20 years old.
In order to solve the seed pro-
curement problem, an attempt
will be made to produce seed in
an indoor orchard. Fecund clones
of European larch can produce
more than I000 viable seeds per
m2 in a greenhouse. If similar
results can be achieved with
Siberian larch, then Iceland’s
current larch seed demand could
be met in 2,000 m2 of greenhouse
floor-space.
An indoor breeding orchard
provides opportunities for ex-
perimenting with hybridization.
Hybrids between Larix sibirica and
Larix decidua, Larix leptolepis and
Larix x eurolepis will be made and
tested along with Siberian larch
families in the progeny tests.
A few clones of Larix lyallii will
also be included in the breeding
program. This species is practi-
cally untried in Iceland, but
might be of value in land re-
clamation.
34
SKÓGRÆKTARRITIÐ 1993