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We aimed to study the ecological service in Plant Genetic Protection Area Ubon Ratchathani Zoo, Ubon Ratchathani Province, Thailand, by focusing upon the carbon storage in aboveground biomass and influences of canopy of the Yang na (Dipterocarpus alatus Roxb. ex G.Don.) Moreover, the current study aimed to investigate influences of canopy of Yang na on other factors. The plant survey was undertaken using quadrat sampling method with an area of 2,400 m for 6 sampling plots of 20x20 m., trees (DBH > 4.5 cm and height > 1.30 m). Our results showed that the Plant Genetic Protection Area Ubon Ratchathani Zoo which is classified as dipterocarp forest and dry evergreen forest had 30 of tree species and 21 families. The most abundant tree species included Dipterocarpus alatus Roxb.ex G.Don, Canarium subulatum Guillaumin, Ellipanthus tomentosus Kurz var. tomentosus and Parinari anamensis Hance. Besides, 17 species and 13 families of undergrowth plants were found in the area. Polyalthia evecta (Pierre) Finet & Gagnep., and Polyalthia debilis Finet & Gagnep were the predominance plants. According to the analysis on plant community, our results show that the canopy of Yang na had the highest importance value index (129.23) suggesting that canopy of Yang na is plentiful and very important for ecology in the study area. The total CMU J. Nat. Sci. (2020) Vol. 19 (3) 394 aboveground biomass of Yang na was 39.40 tons/1,600 m (rai), and carbon storage in aboveground biomass was 19.53 tons/rai. Moreover, carbon storage in aboveground biomass’s was found highest in trunk (14.65 tons/rai), followed by branch (2.96 tons/rai), and leaf (1.92 tons/rai). When analyzing the relationship between aboveground biomass and circumference and height, and the relationship between Yang na’s carbon storage and circumference and height using Pearson Correlation Coefficient, we found that there was a high level relationship with a statistical significance at a level of 0.01. In addition, our findings revealed that a total of wood volume was 26.0946 m or 0.5219 m of each tree. Furthermore, the average of canopy coverage in Yang na was 87.2%. When investigating the relationship of a percent of canopy coverage, circumference, height, and wood volume, we found that there was less and averagely opposite relationship. In contrast, there was high relationship in the same direction when the relationship of a percent of canopy coverage in Yang na was analyzed. There was, moreover, averagely opposite relationship when examining the relationship of a percent of canopy coverage in Yang na and the amount of other trees. Collectively, when there was a higher percentage of canopy coverage of Yang na, the circumference, height, and wood volume of Yang na slightly decreased. Moreover, a large number of Yang na was accompanied with a smaller number of other trees in the plots, and there was also a small quantity of plant species diversity. Therefore, it could be suggested that the Ubon Ratchathani Zoo should promptly implement the plan for the promotion and conservation of Yang na as well as knowledge transfer activities to communities.

Evaluation on Carbon Storage in Aboveground Biomass of Yang na at Plant Genetic Protection Area, Ubon Ratchathani Province