VEGETATION DYNAMICS OF PERMANENT PLOT IN DIPTEROCARP FOREST BUKIT BANGKIRAI, EAST KALIMANTAN

• Main Author: Dandi, Robi
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/74916
• Institution: Institut Teknologi Bandung

Vegetation dynamics in dipterocarp forest permanent plots after fire (1997-1998) is important to monitor successional process. Forest monitoring has been conducted since 2001 to 2013 to record tree individuals with diameter more than 4.8 cm, including recruitments and dead individuals to calculate diameter increments and mortality rate. The importance value index (IVI) is calculated from the tree data found in the permanent plots. Tree species name was documented and each individual tree was tagged using an aluminium plate. This research shows that the highest species diversity was found in 2013 (249 species), then decreased in 2022 (237 species). Dominant species during monitoring change from Macaranga gigantea (Euphorbiaceae) and Madhuca kingiana (Sapotaceae) (2001-2002) to Macaranga gigantea (Euphorbiaceae) and Vernonia arborea (2005-2013) and then Macaranga gigantea (Euphorbiaceae) and Madhuca kingiana (Sapotaceae) (2022). Shannon Wiener diversity index (H') in 2022 indicates that species diversity in this permanent plot is high (4.85). Class diameter of trees in the permanent plot is dominated by small individuals (DBH <10 cm) compared with large trees (DBH> 10 cm). The highest diameter increments (IDi) belong to M. gigantea (0.42 cm year-1) and Vernonia arborea (0.41 cm year-1) in the diameter class of 5-10 cm. The highest tree recruitment found in 2005 (41.62%). Mortality rate from 2013-2022 was 3.16%, with high contribution from M. gigantea (141 individuals). Carbon storage value from 2001 to 2022 increased from 38.91 tons ha-1 (2001) to 114.29 tons ha-1 (2022). Successional process in this permanent plot needs to be monitored to assess forest health.