The effect of ecological factors to natural regeneration of Shorea roxburghii G. Don in tropical moist evergreen closed forest at Tan Phu zone of Dong Nai province
Keywords:
Tropical moist evergreen closed forest, Forest plant community, Dominance of mother tree, Natural regeneration, Index of stand structural complexity, Crown competition indexAbstract
The article presents result of the natural regeneration characteristics of the population of Shorea roxburghii under the canopy of the moist tropical evergreen closed forest in Tan Phu area, Dong Nai province. The objective of this study is to determine the effect of dominance of mother tree, structure and competition between trees in the stands, moisture content and pHH2O of topsoil to the natural regeneration of the population of Shorea roxburghii. Data were collected from 9 typical plots of rich forest type. The plot size is 0.25 ha. The natural regeneration of Shorea roxburghii is collected from 90 sub-plots of 16m2 (4 4 m). Moisture content (%), pHH2O in the topsoil in relation to the appearance of (1, 0) Shorea roxburghii saplings collected from 125 different points. Research results have shown that changes in the dominance of mother trees, the structure and competition between trees in the stands and the characteristics of topsoil affect the natural regeneration of the Shorea roxburghii population. The population of Shorea roxburghii regenerates continuously under the forest canopy. The IVI index of the mother tree is from 25% to 35%, the structural complexity index is less than 0.5 and the crown competition index between trees is less than 1.5, the moisture in the topsoil ranges from 60 - 80% and pHH2O ranges from 3.8 to 4.6 are suitable conditions
for natural regeneration of the Shorea roxburghii popula
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