The present status and silvicultural characteristics of Dalbergia cochinchinensis Pierre ex Laness in Gia Lai provinces
Keywords:
Dalbergia cochinchinensis Pierre ex Laness,, silvicultural characteristics, Gia LaiAbstract
Dalbergia cochinchinensis Pierre ex Laness., belonging to the Dalbergia
genus, Fabaceae family, is an endemic timber species of Southeast Asia.
Due to over exploitation, D. cochinchinensis species is at threat level and is
classified as Vulnerable (VU) according to the assessment of the
International Union for Conservation of Nature (2018), the level of
Endangered (EN) in the Vietnam Red Book (2007) and in Appendix IIA of
Decree 06/2019/ND-CP. The standard plot survey method combined with
the line survey was used to assess the current status and silvicultural
characteristics of D. cochinchinensis in Gia Lai province. The survey results determined that D. cochinchinensis was only encountered in the state
of bare land, shifting cultivation, planted forest and restored secondary forest
in the study area. The density of trees of the canopy layer ranged from
808 - 2,156 trees/ha, and timber volume ranged from 14.49 - 114.06 m
3
/ha.
The average diameter at breast heigh and total height of Trac trees are
higher than those of the stand. The species richness ranged from 36 - 78
species. The distribution of tree number and diameter (N/D1.3) conformed
to reverse j-shaped (Meyer’s function form). The density of understory
layer ranged from 1,804 - 7,440 trees/ha. The density and quality of the
understory layers among forest stands are significantly different with the
recovery time. The density of regeneration seedlings of the stands was
27,000 - 43,250 seedlings/ha and number of species ranges from 20 - 25.
The percentage of plants regenerated from seeds is generally greater than
the number of plants regenerated from shoots. The average proportion of
tall saplings of the stand was 17.59 - 19.38%. Two verry common species
with D. cochinchinensis are Aporosa dioica, Styrax agrestis and three
common species are Engelhardtia roxburghiana, Castanopsis pyriformis,
D. cochinchinensis and Machilus grandifolia.
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