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All Journal Aquasains : Jurnal Ilmu Perikanan dan Sumberdaya Perairan Jurnal Penelitian Kehutanan Wallacea
Indriyanto
Jurusan Kehutanan, Fakultas Pertanian, Universitas Lampung
Agriculture, Biological Sciences & Forestry Other

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Composition, domination, and similarity level of stand among farmers' cultivated blocks at Wan Abdul Rachman Grand Forest Park Indriyanto
Jurnal Penelitian Kehutanan Wallacea Vol. 11 No. 2 (2022)
Publisher : Foresty Faculty of Hasanuddin University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1144.848 KB) | DOI: 10.18330/jwallacea.2022.vol11iss2pp139-151

Abstract

The tree species preferred by forest farmers are not always the same, so that in each farmers cultivated block it is possible to form forest stands with a certain composition. The research aimed to analyze the composition of tree species, dominant tree species, and similarity level of species composition among the farmer’s cultivated block. The research was conducted from August until December 2020. Data collection was carried out with a vegetation survey using nested rectangular plots with a sampling intensity of 1%. The data collected includes tree species, tree height, basal area, and individual number of each species. Data were analyzed by calculating density, frequency, important value index (IVI), similarity index (IS), and dissimilarity index (ID). The results showed that the composition of forest garden stands in the farmer’s cultivated block was categorized as heterogeneous (mixed stand) with the number of trees species varying from 12 to 18 species. The total number of tree species were 43, consisting of 17 jungle wood species, 18 jungle MPTS species, and 8 agricultural MPTS species. The forest garden stands were dominated by 4 tree species, namely Gnetum gnemon, Durio zibethinus, Aleurites moluccana, and Myristica fragrans, each of which had an IVI>19.91%. The similarity level of forest garden stands composition was very low with an average IS of 0.27 and an average ID of 0.73. Thus, it can be stated that the forest garden stands among the farmer’s cultivated blocks had different compositions with a difference of 73%. The heterogeneity of forest garden stands needs to be maintained and even developed so that the ecological function of the forest is maintained and the non-timber produced is sufficiently diverse to meet the needs of communities living around the forest.
CHARACTERISTICS OF MANGROVE VEGETATION DAMAGE BASED ON THE EXTENT AND SEVERITY OF INFESTATION ON PAHAWANG ISLAND, PESAWARAN REGENCY Bela Apriandini; Machya Kartika Tsani; Inggar Damayanti; Indriyanto
Aquasains: Jurnal Ilmu Perikanan dan Sumberdaya Perairan Vol. 14 No. 2 (2026): March 2026
Publisher : Jurusan Perikanan dan Kelautan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/aqs.v14i2.12965

Abstract

Mangrove ecosystems on Pahawang Island are subjected to biotic, abiotic, and anthropogenic pressures that may compromise vegetation health. However, studies investigating organ damage based on the extent and severity of infestation in this area remain limited. This study aimed to analyze the characteristics of mangrove organ damage, the extent and severity of infestation, and the factors contributing to vegetation damage. Data were collected using a quantitative descriptive approach through field surveys. Observations were conducted in 23 plots across three sampling stations representing sparse (R. mucronata), moderate (R. mucronata), and dense (R. apiculata) mangrove stands. The assessed parameters included types of damage, the percentage of damaged organs, the extent of infestation, and the severity of infestation. The results identified ten types of damage affecting leaves, stems, and branches. The mean infestation extent across all stations was classified as very severe, reaching 92.69%. Despite the extensive occurrence of damage, the severity at the individual-tree level remained in the light-to-moderate category, with the highest severity recorded in the stems of mature trees (46.45%). These findings indicate that the mangrove vegetation retains a considerable capacity for recovery. Vegetation damage was associated with a combination of biotic factors, including defoliating insects, Littoraria sp., termites, and pathogenic fungi; abiotic factors, such as salinity, temperature fluctuations, and wave action; as well as anthropogenic pressures, including solid waste accumulation, tourism, and settlement activities. These findings highlight the need for integrated management of biotic disturbances and anthropogenic pressures to support the recovery and long-term health of the mangrove ecosystem on Pahawang Island.
Co-Authors Bela Apriandini Inggar Damayanti Machya Kartika Tsani