CONVERSION OF THE Pinus caribeae PLANTATIONS IN UPCOUNTRY
INTERMEDIATE ZONE WITH OTHER POSSIBLE TREE SPECIES
Pine plantations in the upcountry are now in their rotation end. These
plantations has been planted in comparatively degraded patana lands. At
present, as a policy it was decided not to reforest the second rotation
lands again with pines. Therefore the conversion of pine plantations with
other suitable tree species has become priority area for study in the
A research project was initiated in 1994 to investigate the possibility
of converting the available pine plantations to other broad leaved species.
As the first phase, nine timber species, nitrogen fixing soft wood species,
woody herbal species and non-woody herbal species were tested under different
thinning levels (Basal area 10 m2 ha-1 , 15 m2 ha-1, 20 m2 ha-1 and control).
As the second phase the selected timber species from phase one (Michelia
champaca, Swietenia macrophylla) and some other possible tree species
(Artocarpus fraxinifollus, Ecucalyptus grandis, Eucalyptus microcorys,
Acacia melanoxylon and Kyaya senagalensis) were established under different
levels of gap openings (4 m, 6 m and 20 m).
The initial tree growth assessment of the second phase experiment was
done after 15 months of planting. The fast growing exotic species E. grandis,
E. microcorys and A. melanoxyion showed the highest height growth 3.0
m, 2.8 m and 1.2 m respectively under the heavy thinning level (20 m gap).
Other than S. macrophylla and K. senagalensis all other tree showed a
significantly higher tree height growth under the heavy canopy opening
Department of Forestry and Environmental Science,
of Sri Jayewardenepura,Sri Lanka. 1995-2000. All rights reserved.