Structure, floristic diversity and dynamics of a seasonal rain forest, Sakaerat, northeast Thailand 1. Structure and floristic composition
2002
Pongsak Sahunalu
Woody plant composition in 1 ha area consists of 72 species belonging to 43 families and 62 genera of trees and lianas with D = 4.5 cm of which 57 species belonging to 30 families and 49 genera are trees and 15 species belonging to 13 families and 13 genera are lianas. Woody plant density is 1,612 stems/ha (1,488 stems/ha for trees and 124 stems/ha for lianas). Those below this size limit are also described. Stratification of the canopy trees shows three strata with the third stratum possibly divided further into 2 substrata. Size-structure determined by D distribution follows the negative power function model and height distribution is approximately a bell-shaped curve with slightly negative skewness. Species composition investigated separately among 3 size-class categories reveals that 2 highest IVI values of woody plants (D = 4.5 cm) are for Hopea ferrea and Memecylon ovatum with the abundance of lianas, Ancistrocladus tectorius and Ventilago harmandiana having highest IVI values in the first size-class. The abundance of Hopea ferrea is found in all 3 size-class categories suggesting a monodominant stand of this species with low species abundance but rather high density of other woody plants in lower 2 size-classes and herbs as undergrowth. Species-area relationships of woody plants having D = 4.5 cm is well fitted to a positive power function model suggesting a rapid increase of species number in a few small plot sizes and shows plateauing at around 6,400 square m of plot area.
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This bibliographic record has been provided by Thai National AGRIS Centre, Kasetsart University
