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Tree Species Richness and Diversity of Community Forestry in Uttaradit Province, Thailand
The purpose of this study was to explore the characteristics of the structure, species composition and species diversity in the community forest at Uttaradit province, Lower North of Thailand. The vertical stratification of the tree canopy can affect the growth of young trees on the ground surface, especially that of saplings and seedlings. Ground species can establish themselves very quickly when the light intensity is high enough and especially when the light can penetrate directly to the ground during gap formation. The data of tree individuals have served to give insight into the stand density, basal area, and frequency number of DBH class ranges. There were a large number of DBH class ranges, but there were low DBH values. The species composition of community forest is low, rich and diverse, but in high density. The comparison between community forest in this study and other forest is that tree density is higher than other forests but number of species is similar or lower. Importance value index (IVI) is used to determine the dominant trees in each plot. The result showed that dominant trees of Ban-Khum (BK) are Tectona grandis, Dalbergia cultrate, Strychnosnux-blanda, Terminalia corticosa and Microcos paniculata. While the dominant trees of Ban-Lao (BL) plot are Aporosa villosa, Dipterocarpus obtusifolius, Terminalia corticosa, Cananga odorata and Heliciopsis terminalis. The dominant trees of Khao-Sak (KS) plot are Azadirachta indica, Parinaria namense, Ziziphus jujube, Feronia limonia and Senna siamea, and the dominant trees of Huai-Kan-Leang (HKL) are Parashorea stellate, Xyliaxylo carpa, Cananga odorata, Lagerstroemia tomentosa and Cananga latifolia, respectively. The Fisher’s, Shannon-Wiener’s index and Simpson’s index in these studies are found to be lower than other forests. The size class distribution of trees in secondary mixed deciduous forest is shown to be on L-shape curve, which is high abundance of small trees.
Keywords
Community Forest, Species Richness, Species Diversity, Forest Community.
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