Jurnal Ilmu Kehutanan

Front Matters

Diana Mahayani — Tue, 26 Mar 2024 21:55:04 +0700

Sixty Years of UGM Forestry Faculty’s Work in Preserving Indonesia’s Forests and Environment

Mon, 25 Mar 2024 11:13:20 +0700

Given a mandate to preserve the Indonesia tropical forest through its education, research, and community service activities, the Faculty of Forestry Universitas Gadjah Mada (FoF UGM) has reached broad stakeholders to support sustainable forest management and climate mitigation (SDG 13 and 17). FoF UGM supports basic and applied research contributing to forestry industrialization (SDG 9), such as improved planting materials for Tectona grandis and Eucalyptus sp. In collaboration with the community (SDG 1 and 2), FoF UGM also diversifies kajuput essential oil produced in Wanagama and UGM teaching forests. Technology innovations such as glue and cross-laminated timber, biodiesel, information systems, and drone technologies for land rehabilitation and carbon accounting represent the institution's commitment to improving Indonesia's forest, forestry, community, and national economy (SDG 13 and 15).

Blue Carbon Potential of Mangrove Ecosystem on the Coast of Negeri Waai, Central Maluku Regency

Rahman Rahman, Juliana W. Tuahatu, Christin Tuhehay — Mon, 25 Mar 2024 11:15:26 +0700

The mangrove ecosystem contributes to climate change mitigation by absorbing carbon dioxide gas. The shoreline of Negeri Waai, Central Maluku Regency (CMR), becomes one of Indonesia's promising mangrove ecosystem habitats for carbon absorption. Therefore, this research aimed to assess the blue carbon potential of mangroves on the coast of Negeri Waai, CMR. This research collected data using the quadrant transect method (10 x 10 m) and placed randomly in 65 quadrants. The analysis of blue carbon potential used an allometric approach to above and below-ground biomass (AGB and BGB). The results showed that the total blue carbon mangrove stock on the coast of Negeri Waai was 73.22 ton C/ha, consisting of 49.44 tons C/ha above-ground carbon (AGC) and 23.78 tons C/ha below-ground carbon (BGC). Sonneratia alba contributed the most extensive carbon stock, namely 70.69 ton C/ha, consisting of 47.53 tons C/ha AGC and 23.16 tons C/ha BGC. This result was relatively low compared to the global average of blue carbon in mangroves, 134 ton C/ha. Based on this result, efforts were needed to restore the mangrove ecosystem, increase the potential for carbon absorption, and mitigate climate change.

The Impacts of Commercial Logging on Social-Economy of Communities in Mentawai Islands

Juniator Tulius, Myrna Eindhoven — Mon, 25 Mar 2024 11:17:59 +0700

This research aimed to analyze the effects of commercial logging on the indigenous communities of the Mentawai Islands. Over the past five decades, inhabitants, particularly those residing on Siberut Island, were entangled in a conflict of interest concerning small and large-scale commercial logging activities. The results showed that despite the implementation of regional autonomy in the early 2000s, delegating decision-making authority over natural resource use, local communities and government actively promoted sustainable practices. In the context of the Mentawai Islands, the anticipated outcomes still needed to materialize.

Enhancing Tenure Security: A Case Study of the Social Forestry Scheme in the State Forestry Corporation, Malang District, East Java

Ramli Ramadhan, Alvin Naharul Riski, Mochamad Chanan — Mon, 25 Mar 2024 00:00:00 +0700

The Social Forestry Program was a government initiative that yielded significant outcomes and provided unprecedented access and opportunities to the community. One notable change has occurred in the Perhutani area through a scheme known as IPHPS. This scheme provides long-term tenure security to forest farmers with higher returns than before. In addition, extensive experience in addressing tenure conflicts in the Perhutani area, a State Forestry Corporation (SFC), has prompted communities to apply for the IPHPS scheme. Therefore, this research aimed to investigate the dynamics of changes in access and assess their implementation using the concept of property rights as a framework. The results showed that the IPHPS scheme provided community groups the right to manage forests but needed more flexibility to decide on the use of resources. In addition, the management patterns regulation had a significant responsibility to restore forest conditions. Furthermore, this research proposed new rights, particularly management rights, for community groups to manage their forest resources up to the operational level and improve forest conditions. In addition, the absence of a management authority caused difficulties in achieving social forestry's objective of increasing local communities' role in managing their forest resources.

Vulnerability Assessment of Fallen Trees Along Arterial Road of Bukit Soeharto Grand Forest Park Using Google Street View

Ali Suhardiman, Frans Milan, Yosep Ruslim, Ariyanto Ariyanto, Hari Siswanto — Mon, 25 Mar 2024 11:19:42 +0700

The incidence of fallen trees along the roadside was widespread across various locations in Indonesia, particularly in areas where trees naturally thrive. Therefore, this research aimed to explore Google Street View (GSV) to obtain information regarding the potential of fallen trees. A novel approach was proposed using panoramic photos available in GSV data from May 2021 and then subjected to testing along Balikpapan–Samarinda Arterial Road, covering a distance of 33 kilometers (Km), which traversed Bukit Soeharto Grand Forest Park (BSGFP). Leaning trees, trees with imbalanced canopy proportion, dying trees, and trees in rough topography became the criteria specified from GSV photos to determine potentially fallen trees. The results showed that 224 trees along Arterial Road met those criteria, translating to approximately 6.79 trees per kilometer of Arterial Road. The analysis revealed that an imbalance canopy proportion was the primary cause of fallen trees, supported by investigations and comparisons with the corresponding GSV photos before the collapse. The Arterial Road Balikpapan-Samarinda poses moderate fallen tree vulnerability, scoring between 25% and 50%.

Small and Medium Scales Business Development Model and Value Chain of Apis mellifera L. Bee Cultivation in Riau Province

Mon, 25 Mar 2024 11:20:45 +0700

Beekeeping practice was an alternative livelihood for communities around forest areas, offering a potential solution to reduce conflicts arising from the use and management of this ecosystem. Starting in the COVID-19 pandemic, the government introduced Apis mellifera from Java island into honey production in Sumatra due to its high productivity and adaptability to new environments. Therefore, this research aimed to explore the challenges and develop business models and value chains associated with commercializing Apis mellifera honey. The analysis used a qualitative descriptive method through observation and in-depth interviews with beekeeping entrepreneurs. There were two sales systems. The first was direct from beekeepers, and the second was indirect sales systems facilitated by collectors/industries. The collectors/industries gained a significant profit, approximately IDR. 80,000.00/kg, while beekeepers only received a minimum selling price. Marketing became a significant issue as beekeepers tended to focus more on cultivation efforts, resulting in a simplistic method of honey sales. Consequently, providing maximum economic value to the communities around the forest areas required synergy and assistance from related sectors.

Assessing Carbon dioxide (CO2) Absorption Potential of Forests Around Landslides Along the Trans Palopo-Toraja Highways

Witno Witno, Maria Maria, Liana Liana, Wardi Wardi — Mon, 25 Mar 2024 11:21:55 +0700

Forests are crucial in absorbing carbon dioxide (CO₂) from the atmosphere through photosynthesis and storing the carbon in its biomass. This research aimed to assess the potential for CO₂ absorption of forests around landslides along the Trans Palopo-Toraja highways. This research employed a destructive sampling to measure understorey and litter biomass. Furthermore, it measured the biomass of understorey plants and litter with a destructive method. The 12 measurement plots were purposively placed on the landslide points to represent various vegetation conditions. The results revealed the presence of 77 plant species, totaling 554 individuals on the measurement plots. Plot 4 and Plot 1 showed the highest and lowest carbon absorption potential at 790.39 tons/ha and 199.63 tons/ha, respectively. The estimated average absorption of 12 plots was 461.75 tons/ha. Tree-level vegetation had the highest carbon absorption value due to its bigger diameter and CO₂ absorption capacity than saplings and poles.

The Effect of Wood Species and Laminae Composition on the Properties of Cross-Laminated Beam Made from Community Forest Wood

Greitta Kusuma Dewi, Tibertius Agus Prayitno, Ragil Widyorini — Mon, 25 Mar 2024 11:23:00 +0700

Community forests offer diverse wood species and quantities, potentially meeting the increasing demand for wood-building materials driven by the green building concept. The diverse species have varied specific gravity. Combining wood species and cross-lamination engineering could improve the strength and dimensional stability of low-density and medium-density wood from community forests. Therefore, this research aimed to determine the effect of wood species and laminae composition on the properties of 5-ply cross-laminated beams (CLB). The 5-ply CLB was made in 5 cm x 5 cm x 112 cm with 1 cm laminae thickness. The species used were sengon, jabon, and mahogany, with acacia as enforcement. This research also compared homogeneous and heterogeneous laminae composition. The results showed that wood species and laminae composition significantly affect the mechanical properties. Heterogeneous compositions had higher mechanical properties than homogeneous compositions. The delamination test revealed that the CLB had high water resistance on cold and hot immersion even though the beams used up to three wood species.

Using the Diversity of Lichens in Maribu Forest Area, West Sentani District, Jayapura Regency as a Baseline Data on Environmental Changes

Suharno Suharno, Hasifa Hasifa, Supeni Sufaati — Mon, 25 Mar 2024 11:23:53 +0700

Lichens are thallophytes, capable of absorbing water, nutrients, and chemical compounds in the air, which led to their application as bio-indicators of air quality. Therefore, this research aimed to determine the abundance and diversity of lichens in the Maribu Village, West Sentani District, Jayapura Regency. This research used the exploration method by tracing the observation paths for vegetation and the presence of lichens. This research established three observation stations with three observation plots of 5 m × 5 m in each station. The obtained samples were identified in the Biology Laboratory of FMIPA Cenderawasih University. This research identified 14 tree species belonging to 12 families and 22 species of lichens belonging to 10 families in the observation plots. Phlyctis argena (39 colonies) and Cryptothecia striata (32 colonies) had the highest colony and fell in the 'very
common' category, with the diversity index value (H') of 2.79, which was in the medium category status. The results became the first recorded data in the lowland areas of Papua and could become a baseline for further research.

Forest as A Living Space: Rulership and Management in the Tenganan Pegringsingan Customary Forest, Karangasem Regency, Bali

Aloysius Gonzaga Dimas Bintarta Raharja, Muhammad Baiquni, Setiadi Setiadi — Mon, 25 Mar 2024 11:25:22 +0700

Humans control their cultural environment, which is associated with biotic and abiotic environments, resulting in environmental sustainability. The indigenous community's existence in managing environmental resources must be examined more deeply from the perspective of human ecology. Therefore, this research aimed to examine and analyze the management of resources and environment, mainly the customary forest in the Tenganan Pegringsingan indigenous community. This research employed a participatory observation and spatial ethnography paradigm to understand the pattern of the Tenganan Pegringsingan customary forest management based on customary law (awig-awig), legal delegation (The Customary Forest Decree), and the access of stakeholders to the customary forest. The customary forest governance involved krama desa, the land inheritance rights owners of the Tenganan Pegringsingan indigenous community, and Penyakap, immigrants/krama sesambahan tillers in the customary forest. These three stakeholders had different spatial access to the customary forest as a place and a space.

Description and Preferences of Tarsier (Tarsius supriatnai) Nest Trees in Nantu Wildlife Reserve, Gorontalo

Terri Repi — Mon, 25 Mar 2024 11:26:12 +0700

Tarsiers (Tarsius supriatnai) were part of the endemic primates in Sulawesi categorized as vulnerable in the IUCN red list. Therefore, this research aimed to describe and analyze the characteristics, preferences, and determinant factors influencing the use of nest trees by tarsiers in Nantu Wildlife Reserve, Gorontalo. This research used a direct observation method to collect data for three months, from September to November 2013, focusing on temperature, humidity, light intensity, tree height, tree diameter, nest height from the ground, and frequency of nest use. Moreovr, the Neu index was applied to determine nest preferences and multiple linear regression analysis was used to analyze the factors influencing nest tree selection. The results showed that the primates preferred eight nest trees, including Ficus altissima (w=1.58) and Ficus benjamina (w=1.50). Multiple linear regression analysis showed that the humidity (4.103±3.674%, P>0.05) and light intensity (126.362±41.149 lx, P<0.05) became dominant factors influencing the frequency of nest use. The results generally showed that vegetation species and microclimate conditions were crucial for tarsiers, indicating the importance of preserving forest areas to ensure the conservation of these primates.

Back Matter

Dwi Fitri — Tue, 26 Mar 2024 21:53:21 +0700