Överlevnad och tillväxt för nyplantersade barrots- och täckrotsplantor
en studie av 42 bestånd i södra Sverige
The choice between bare-rooted and containerized seedlings in southern Sweden affects
the investment costs as well as growth and survival. It is important to take these differences
into account when choosing seedling type for reforestation. The most important
differences between the two seedling-types is that bare-rooted seedlings has open root
systems whereas the roots of containerized seedlings are grown in a container which may
contain water and nutrients that are available for the seedling during the first period after
planting. Moreover, bare-rooted seedlings are often older which results in thicker stembase
and better resistance to attacks of pine-weevil (Hylobius abietis).
In order to study differences in survival and growth between bare-rooted and containerized
seedlings a survey study of newly planted clearcuts in south-western Sweden was
made. In the study tree seedling types was included, one bare-rooted and two containerized
with different ages.
The population of pine weevils was probably low during the studied period which
resulted in lower pine-weevil damage than normally found in this area. Because of low
pine weevil damage, other damaging agents became more important.
The most significant difference between the two seedling types was the amount of
damage without any known damaging agent. Bare-rooted seedlings had more than four
times as many damages of unknown origin as containerised. It is hypothesized that
handling of the seedlings before and during planting may have been an important reason
for this difference because bare-rooted seedlings are more sensitive than containerised
ones.
Containerised seedlings had larger height-growth and greener needles than bare-rooted
seedlings after the first growing season, which indicates that containerised seedlings was
able to establish faster in its new environment after planting than bare-rooted seedlings.
The older containerized seedling (1.5 years) hade larger height-growth than the younger
(1 years) but the difference was small. There where no measurable difference in survival
between the two containerised seedling types