DINAMIKA KOMUNITAS POHON PADA SATU HEKTAR PLOT PERMANEN DI HUTAN TROPIKA MONTANA, GUNUNG PAPANDAYAN, JAWA BARAT

• Main Author: Yudha Putra, Gerald
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/66393
• Institution: Institut Teknologi Bandung

The establishment and periodic inventory of permanent plots is very important in long-term forest dynamics change studies such as to assess the sustainability of forest existence in the future. We investigated the dynamics of tree communities and populations of 33 species in a tropical montane forest area within the Mount Papandayan Nature Reserve, Garut Regency, West Java, Indonesia, based on censuses conducted in 2011 and 2021 in a permanent plot of 1 ha. The aims of this study were to identify patterns of growth, recruitment and mortality in tree communities; identification of species specific the growth patterns and their relation to the character of wood density; and using the projected mean growth diameter at breast height (DBH) to estimate the time it takes for a tree species to grow to reach a certain DBH size. Remeasurement of tree diameters recovered from the 2011 census was carried out, measuring new individual trees with a size of 5 cm, and recording dead trees. It was found in the permanent plot that the average growth rate peaked at DBH >30-50 cm and decreased at DBH >50cm, the rate of tree recruitment and addition of basal area exceeded the mortality rate and basal area reduction. Mortality frequency was found to be greater than expected in the smallest DBH class ????????2 = 31.202, p < 0.01) even though the distribution of the proportion of the number of ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????2 = 1.405, p > 0.5). Individuals with light wood density experienced the highest average DBH growth rate in each DBH class. Symplocos lucida (Thunb.) Siebold & Zucc. and Turpinia montana (Bl.) Kurz experienced the highest recruitment and mortality rates, respectively. Engelhardtia spicata (Lesch.) ex Bl. and Helicia serrata Bl. experienced the highest (4.6 mm yr-1) and the lowest (-0.35 mm yr-1) average DBH growth rates, respectively. Acer Laurinum Hassk. was the fastest growing species to reach DBH 10cm (16.5 years) and Engelhardtia spicata (Lesch.) ex Bl. the fastest to reach DBH 30cm (89.2 years) and DBH 60cm (122 years) based on the projected results of DBH growth for age. In the span of 10 years, the tree community showed a positive net change due to a higher recruitment rate than mortality, this result ensures the continuity of the forest in its current condition.