Keywords :
Deciduous dipterocarp forest; Sakaerat; Species composition; Structural analysis.
บทคัดย่อ :
Stand structure and species composition were analyzed in 4 stands, each 1 ha square plot established for the long-term forest dynamic studies in Sakaerat deciduous dipterocarp forest (SDDF) in 1894. All 4 stands exhibit their stand structural organization as being open and less crown overlapping among the canopy tree species. The stands are identified as having considerable large canopy gap. The forest canopy is stratified into 2 layers in stand 1 and 3; and 3 layers in stand 2 and 4 in this forest type. The stands are dominated by tree species belonging to Dipterocarpaceae family and being co-occurrence with several tree species in other families. Stand density of trees (DBH >= 4.5 cm) in the 4 stands varies from 555 to 823 trees.ha-1. Species composition ranges from 32 to 37 species, average tree height from 7.48 to 12.08 m, total basal area from 14.52 to19.11 m2.ha-1. Species diversity as determined by Shannon-Weiner s index varies from 1.980 to 2.732. These stand parameters are recorded and used as the baseline information for future long-term study on their dynamics. The different 4 stands are classified basing on the highest and the next following importance value index (IVI) of the leading two co-occurring tree species as 4 association types:
(1) Shorea roxburghii-Quercus kerrii, (2) Shorea obtusa-Shorea siamensis, (3) Shorea obtusa- Pterocarpus macrocarpus and (4) Shorea siamensis-Shorea roxburghii association types in stands1, 2, 3, and 4 respectively.
เอกสารอ้างอิง :
Sahunalu, P. (2009). Stand structure and species composition in the long-term dynamic plots of Sakaerat deciduous dipterocarp forest, Northeastern Thailand. Journal of Forest Management, 3(6), 1-20.
