Evaluasi Pertumbuhan Hasil Hutan Bukan Kayu Di Hutan Kemasyarakatan Aik Bual Kabupaten Lombok Tengah

Growth Evaluation of Non-Timber Forest Products in The Aik Bual Community Forest, Central Lombok Regency

Abstract

The sustainable management of forest resources has become increasingly important, particularly in community-managed forests where non-timber forest products (NTFPs) play a crucial role in local livelihoods and biodiversity conservation. This study aims to identify the types of NTFPs, the density and diversity of vegetation, and the average growth of NTFPs in the Community Forest (HKm) of Aik Bual. The research utilized a descriptive method and was conducted from August to September 2022 on HKm land in Aik Bual Village, Central Lombok, which received enrichment assistance for NTFP plants. The study population consisted of 164 HKm farmers, with an average land ownership of 50-60 ares. The sample used in this study comprised 20 plots managed by farmers. On these plots, a main plot of 25 m x 40 m and subplots of 20 m x 20 m and 10 m x 10 m were established. In the 25 m x 40 m plots, all NTFPs were surveyed, while other vegetation at tree and pole levels was measured in the 20 m x 20 m and 10 m x 10 m subplots. Parameters measured included diameter, height, and vegetation type. The analysis included vegetation diversity, density, dominance index, and NTFP growth. The results showed that there are nine types of NTFPs in the Community Forest of Aik Bual, namely avocado, durian, guava, mango, jackfruit, cocoa, silk cotton tree, melinjo tree, and sapodilla. Additionally, five types of non-wood forest products were identified. The vegetation density at the tree level in HKm Aik Bual was 515 individuals/ha, while at the pole level it was 545 individuals/ha. The highest importance value index (IVI) at the tree level was recorded for rajumas and mahogany, with values of 82% and 78,70%, respectively. At the pole level, durian and avocado had the highest IVI, with values of 123,69% and 70,08%, respectively. The dominance index at the tree level was dominated by rajumas and mahogany with a value of 0,07, while at the pole level, durian dominated with a value of 0,17. The average diameter growth for avocado at ages 1, 4, 5, 10, and 20 years was 1,49 cm/year, 2,42 cm/year, 2,55 cm/year, 1,98 cm/year, and 1,64 cm/year, respectively. For durian, the average diameter growth at these ages was 1,43 cm/year, 2,76 cm/year, 2,35 cm/year, 1,68 cm/year, and 1,71 cm/year. The average height growth for avocado at ages 1, 4, 5, 10, and 20 years was 1,33 m/year, 1,42 m/year, 1,62 m/year, 1 m/year, and 0,60 m/year, respectively. For durian, the average height growth at these ages was 1,24 m/year, 1,39 m/year, 1,50 m/year, 1,07 m/year, and 0,71 m/year.

Keywords: NTFS, Growth, Dominance Index, Vegetation Density