Species Composition,Diversity and Structure of Secondary Tropical Forests Following Selective Logging in Huong Son,Ha Tinh Province,Vietnam

概要

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Species composition, diversity and structure of Houng Son secondary forests post-logged 2 years (PL2), 12 years (PL12) and 22 years (PL"") were studied in may 2004. Percent composition of families and number of commercial species found in the plot PL2 were lower in composition with those of two other ploots. The medium SOrensen similarity index, ranging from 29.55 to 40.25%, found for all tree size classes showed a slightly high dismilarity between plots. Simpson's index for all tree size classes was quite similar among plots through only small difference was found for seedlings in the plot PL2. Shannon-Wiener index (H') in all plots exhibited relatively high, ranging from 1.76 to 3.48, for all size classes combined but revealed slightly low doversity indices for commercial species. Species richness and evenness (H) turned out to be the best indices for demonstrating diversity among plots. The size classes distribution with Weibull model showed nearly a continuously inverse J-shaped curve. Except the plot PL2 and the plot PL12 followed a similarly exponential trend, the plot PL22 showed a left skewed shape. However, the result of basal area showed that the PL2 had lower basal area than others. All plots showed having some commercial species with relatively high importance value index along with a proportion contributed by other noncommercial ones, i.e. Syzygium cinereum and Diospyros apiculata.
九州大学の論文