BIODIVERSITY DYNAMICS OF TREES IN 4 PERMANENT SAMPLE PLOTS, EVERGREEN, DRY EVERGREEN, MIXED DECIDUOUS AND PINE-DRY DIPTEROCARP FORESTS IN THE CENTRAL, WESTERN AND EASTERN REGIONS OF THAILAND
Thammanoon Temchai/ Email: dhamma57@gmail.com
National Parks Research Center (Petchburi)
National Parks Office, Department of National Parks, Wildlife and Plant Conservation, THAILAND
ABSTRACT
This study was to monitor the dynamics in various fields of forest resources including the dynamic
of tree biodiversity. The permanent plot of 120 x 120 meters was used in Pine-dry dipterocarp
forests (central region), moist evergreen forests (eastern region), Mixed deciduous and Dry evergreen forest (western region), which were created in 2010, 2011, 2012 and 2015, respectively, these sample plots had annual tree growth measurements, were used to study the trend of change by the Shannon-Wiener Diversity Index. And compared these changes by using the Hutcheson t-test
method at a significance level of 0.05. The study found that biodiversity in the pine-dry dipterocarp forest in the central region and the dry evergreen forest in the western region tended to increase slightly, but there was no statistically significant difference. Mixed deciduous forest in the western
region tended to decrease slightly and then increase, but there were no statistically significant
differences either. But biodiversity in the moist evergreen forest of the eastern region is a continuous decreasing trend, and there are statistically different when the time difference was 6-7 years.