Skógræktarritið - 15.05.2001, Side 83

discussed. This part also in-
cludes illustrations of various
cones, catkins and husks of tree
species, as well as routines for
collecting, storing, extracting and
processing. It is intended for the
public who may have an interest
in growing their own trees and
forestry students and technicians
who may not have much experi-
ence in collecting and processing
seeds.
PART 5: TREE NURSERY
It is the author's opinion that
anyone entrusted with an expen-
sive tree-planting program ought
to have at least a couple of years
of experience in nursery practice.
The basic knowledge and experi-
ence of what it takes to make
seedlings grow well, is a valuable
asset for creating successful
plantations in harsh environ-
ments. Except for matters related
to production costs, the merits of
container seedlings vs bare root
seedlings for general purpose
planting are still unresolved. The
author's experience clearly indi-
cates the superiority of bare-root
stock for planting on barrens and
on atrocious urban sites. The
main reasons are that bare-root
stock has a larger stem and root
mass. Bare-root stock also con-
tains considerably more in situ
nutrient reserves in the soil
attached to root-ball and within
the seedling. This enables bare-
root stock to survive, adapt and
grow more quickly on harsh sites
than seedlings grown in small
containerised plugs. The techni-
cal reasons for the difference in
performance are explained.
PART 6: TREE PLANTING
The standard tree planting speci-
fications are well-crafted and
should be adhered to when
planting relatively benign sites.
However, in the first stages, or at
least on the leading edge of
plantations on exposed sites
some minor modifications to the
standard specifications need to
be adopted. The principal goal is
to break up strong laminar flow
of surface winds into beneficial
turbulence. This can be achieved
by creating rough leading edges
and avoiding planting in straight
rows which can channel wind and
create strong jets that perma-
nently diminish growth potential.
Fig.2. An example of shelterwood.
Compare the growth of spruce on the
right (in sheiter) with a traditional
plantation without shelter on the left.
Dæmi um skjólskógrcekl. Berið saman vöxt
grenisins hœgramegin (íshjóii) og hefbundna
skjóilausa gróðursetningu vinstramegin.
This gives a brief overview of
planting practices in accordance
with standard specifications
developed by the Department of
Forest Resources and Agrifoods.
However, there are minor points
in the standard specification
used by DFRA that need adjust-
ment for planting on exposed
sites on windy barrens.
PART 7: SHELTERWOOD
SILVICULTURE
Forest management on the
Avalon Peninsula is geared much
more to multiple-use than else-
where in the Province. The multi-
ple use strategy is made all the
more complex by the fact that the
best plantable denuded scrub-
land lies within the jurisdiction of
municipalities. The uncertainty of
urban development over the long
term tends to dampen enthusi-
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81