Regeneration dynamics of broadleaf evergreen forests in Xuan Son National Park, Phu Tho provice
Keywords:
Regeneration dynamics, broadleaf evergreen forests, Xuan Son National ParkAbstract
The observation of dynamics of broadleaf evergreen forests in the three
permenant plots (each 1ha) suggested that there existed a species accumulation
in time; the number new regenerated species in a certain period was lower than
that of species accumulated in the older tree layers, specifically, there was
an increasing in the number of species from tree regeneration layer
(CTS:D1.3<1.0cm) < low tree layer (TCN: 1.0cm<D
1.3<10.0cm) < high tree layer
(TCC: D1.3≥10.0cm). The tree regeneration density considerably fluctuated
from 24,444 to 31,076 trees/ha. The number of regenerating trees was
13,418 trees/ha/year supplemented and 15,977 trees/ha/year died on
average. The dead rate of regenerating trees was 73.30% for trees below
0.5m and 38.3% for trees above 1.5m in high. In a 5 - year observation
period (2007 - 2012), from 64,000 to 69,000 regenerating trees/ha was
supplemented and from 73,000 to 85,000 trees/ha died. The number of
regenerating trees reached to the low tree layer ranged from 116 to 382
trees/ha. The tree number of the low tree layer was from 3 to 43 trees/ha for
trees reached to the high tree layer, and from 99 to 184 trees/ha for trees
died. The dead tree number of the high tree layer changed from 6 to 90
trees/ha.
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