Realized genetic gain in growth and stem quality of breed seedsources of Acacia crassicarpacompared to natural provenances and commercial seedsources in Quang Tri
Keywords:
Acasia crassicarpa, natural provenances, realized gainAbstract
To identify the growth and realized genetic gain of Acacia crassicarpa
seedlots which was collected from the second-generation seed orchard in
Cam Lo - Quang Tri compared to natural provenances and commercial
seedlot; 09 seedsources was allowed to set up two genetic gain trials in the
sandy and hilly areas of Quang Tri. Each trial had an area of 1ha, designed
incomplete random block experiments, 09 seedlots, 5 replicates,36 trees/plot, planting distance of 3 2 m for both sites. The trees in the sandy trial in Le
Xuyen had slow growth: the avrage diameter was 1.9 cm, the average
height was 2.7 m and the average of volume was 0.6 dm
3
. The stem quality
of different seedsources did not differ significantly in this trial. In the trial
of genetic gain of Acacia crassicarpain hilly areas in Cam Lo at 30 months
of age, the growth in diameter varied from 5.4 cm to 6.5 cm, height varied
from 5.4 m to 6.9 m and volume varies from 6.6 to 12 dm
3
. Seedlots of
families 44, 13 and 46 had superior stem quality, 4.2, 3.6 and 3.7 points
respectively compared to the commercial seedlot of 3.4 points. Regarding
the realized genetic gain, the seedlots from the second generation seed
orchards in Quang Tri and Binh Thuan grew better than natural
provenances and commercial seedlot. The seedlots which were collected
from SSO2, had realized gains in growth of diameter and height by 9 - 26%
compared to the commercial seedlot and 1 - 17% compared to natural
provenances. Seedlots of families 44, 13 and 46 showed very high genetic
gains in volume compared to the commercial seedlot (80%, 73% and 60%)
and natural provenances (55%, 50% and 37%). Families with high genetic
gains in diameter, height and volume all experienced higher increases in
stem quality parameters. The quality of stems of families 44, 13 and 46 also
achieved an increase of 4 - 24% compared to natural provenancesand from
16 - 39% compared to commercial seedlot.
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