Determination of suitability level of enrichment planting of teak (Tectona grandis L.F.) in the degraded dry deciduous dipterocarp forest by direct observed factors and indicator plants
Keywords:
Dipterocarp forest,, enrichment planting, indicator plant, teak suitability levelAbstract
After years of unsustainable logging, the dry deciduous dipterocarp forest (DDDF) has become poor in timber stocks and it has been converted to industrial crops such as rubber. The objectives of this study were to assess teak (Tectona grandis L.f.) tree establishment under degraded DDDF conditions and to determine direct observed factors that influence the suitability of teak as a forest enrichment tree species. A set of 42 experimental plots of 4,900 m2 each (including 64 ecological plots) was set up and observed for 4 - 5 years for testing enrichment planting with teak under various combinations of factors. Weighted, nonlinear, multivariate regression models were used to detect key factors that influenced the suitability of teak. As a result, under extreme ecological and environmental conditions of the DDDF, enrichment planting with teak gave promising results with four suitability levels; and the results also showed that four direct observed factors that affected the suitability of teak were waterlogging during the rainy season; the presence of Eupatorium odoratum L., which indicated good growth potential for teak; percentage of small stone coverage and dominant tree species.
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