Jurnal Manajemen Hutan Tropika
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Home Range and Habitat Use of the Endangered Flores Hawk-eagle (Nisaetus floris) in Ende, Flores, East Nusa Tenggara
Full text linkThe Flores hawk-eagle (Nisaetus floris) is an endangered raptor endemic to the Lesser Sunda region and remains understudied, hindering effective conservation planning. This study investigates the species’ home range, habitat use, and threats at two active nesting sites in Ende District, Flores Island. Home range estimates varied between 8.439 km² (using minimum convex polygon/MCP) and 23.38 km² (using hypothetical-circular home range/HCHR) in Wolojita and from 6.385 km² (MCP) to 23.38 km² (HCHR) in Mbuli. Intensive use areas were relatively small, measuring 0.449 km² in Wolojita and 0.494 km² in Mbuli. Habitat use analysis revealed that in Wolojita, the eagles favored secondary forests, settlements, and shrublands, while in Mbuli, they primarily utilized grasslands and secondary forests, actively avoiding agricultural lands, rice fields, and areas near sulfuric rivers. Secondary forests appear to provide essential resources such as nesting trees and prey availability. However, competition with other raptor species, coupled with anthropogenic threats such as habitat degradation, land-use change, and persecution driven by livestock predation, poses significant risks to the species’ survival. Conservation should focus on preserving secondary forests, promoting sustainable land-use practices, and mitigating human-wildlife conflict to ensure the long-term viability of the population
Allometric Model for Estimating Above-ground Biomass and Carbon Stock of Bambusa vulgaris var. striata
Full text linkBamboo, one of the non-timber forest products, is promising in climate change mitigation strategy due to its ability to remove CO2 from the atmosphere through photosynthesis. However, the allometric model to estimate the biomass and carbon of bamboo is still limited. The research aimed to develop the allometric model using the diameter as the predictor. The materials for destructive sampling were 30 culms of yellow ampel bamboo (Bambusa vulgaris var. striata). A power model was used to analyze data in order to develop an allometric model. Furthermore, data validation was used to leave one out cross-validation (LOOCV), and assessing the difference between predicted and observed values used t-test. The results showed that bamboo biomass was allocated in culms, branches, and leaves at 48.14, 27.66, and 24.20%, respectively. Moreover, the percentage carbon content of culms, branches, and leaves was 55.64%, 50.67%, and 48.48%, respectively. The best allometric model to estimate total biomass was lnWD = -1.846 + 2.218 lnD and to estimate carbon stock was lnC = -2.504 + 2.225 lnD. In conclusion, the diameter at 60 cm from the base (D60) was the best predictor, and adding the predictor length of culm did not improve the allometric model significantly. Moreover, the predictor D0 – Dbh (1.3 m) did not differ significantly in estimating above-ground biomass and carbon stock. Furthermore, for practical purpose, the Dbh is recommended for use in measuring bamboo diameter in the field
Conservation Comprehensive Approach: Study on Exploration, Habitat Analysis, Propagation, and Reintroduction of the Indonesian Endemic Endangered Titan Arum (Amorphophallus titanum Becc.)
Full text linkTitan arum (Amorphophallus titanum Becc.) is an endemic species of Indonesia that is found naturally only in Sumatra and is classified as endangered, with an estimated 303 mature individuals remaining in their natural habitat. The population is decreasing due to deforestation, tuber exploitation, long flowering times, and protandry. Therefore, both in-situ and ex-situ conservation programs are necessary to preserve this species. The research aims to explore natural populations, analyze habitat conditions, develop propagation methods, and conduct reintroduction efforts to support the conservation of A. titanum. This study was conducted from 2023 to 2024 in Palupuah, Agam Regency, the Agriculture Faculty of Universitas Andalas, and several locations for the reintroduction of A. titanum. The research found that A. titanum habitat consists of forests rich in humus and litter, as well as banana cultivation areas. During the exploration, 7 individuals were identified: one in dormancy, one fruiting, and 5 in the vegetative phase. Seed germination experiments categorized seeds into seven classes based on their weight. The most dominant seed class weighed between 2.9 g and 3.2 g, comprising 38 seeds or 26.9% of the total. The germination rate and seedling growth were high, as all seeds exhibited 100% and produced seedlings of relatively uniform size. Propagation was carried out using in vitro culture techniques with petiole explants. The results showed that 2 mg L-1 benzyl aminopurine (BAP) successfully induced callus formation with a 100% induction rate, while a concentration of 1.5 mg L-1 achieved the highest shoot induction rate at 58.3%, with an average of 1.3 shoots and 7.9 roots per explant. The propagated seedlings were subsequently replanted in several locations for reintroduction activities
Forest Conservation by Conserving Socio-cultural Aspects: A Lesson from the Sougb Tribe in Teluk Bintuni, West Papua Province
Full text linkForest has been part of local people such as Sougb Tribe for generations where at the same time they have applied the traditional knowledge. However, the local government has been conducting development for decades with less involvement of the local knowledge. Hence, this research aimed to figure out the traditional knowledge during the forest utilization by Sougb Tribe in Teluk Bintuni, West Papua Province. The data were collected using interviews with the snowball method in subdistricts of Bintuni, Bintuni Timur, Manimeri, Tuhiba, and Tembun. Then, the study revealed that the Sougb Tribe, originally part of the Arfak Tribe, has inhabited the Teluk Bintuni area for generations, migrating from the highlands to the lowlands due to various factors like marriage and conflict. They still maintain customary rights while managing the land through traditional organizations. This tribe relies profoundly on forest resources for sustenance, practicing sustainable agriculture and traditional hunting. Despite facing challenges in forest utilization, they emphasize the importance of biodiversity and traditional knowledge in local conservation. Thus, it is vital to integrate this local wisdom into regional development that can enhance sustainability and cultural preservation, fostering community engagement and ecological balance
Greenhouse Gases Produced During Forest Fires in the La Niña and El Niño Periods in South Sumatra Province
No full textSouth Sumatra Province has characteristics that significantly increase hotspots and produce greenhouse gas (GHG) emissions in strong El Niño phenomena. This study investigates the impact of forest fires on GHG emissions during extreme climate in the South Sumatra Province from 2010 to 2020. This research analyzes the effects of La Niña and El Niño on the region by analyzing factors such as precipitation patterns, temperature fluctuations, hotspots, and greenhouse gas emissions. This study indicates that forest fires mostly happen during the dry season (May to October). El Niño occurred for the second time in 2015-2016 and 2018-2019, which affected the highest fire (hotspots, HSs) during the strong El Niño. Meanwhile, La Niña occurred three times in 2010-2011, 2011-2012, and 2017-2018, which is related to the low HSs found and represents the highest annual rainfall in the last ten years. The highest forest fire (HSs = 17.559) occurs in the characteristics of A1-B4 (precipitation 0-100, SSTA > 0.5°C). The highest GHG emission (>400 Mton) occurred in 2015 when the strong El Niño occurred in South Sumatra Province. The strong and weak El Niño produces the highest GHG emissions of more than 30 megatons per day, while the maximum mean daily GHG emission is under 10 megatons per day. Hotspot numbers rise exponentially with increasing SSTA, showing strong statistical relationships (R² > 0.80, r > 0.79) with burned area (R² = 0.90, r = 0.92) and burned area with CO₂ emissions (R² = 0.77, r = 0.79)
Big Data-Driven Risk Analysis of Environmental Grievances in the Palm Oil Industry for Sustainable Decision-Making
No full textThe expansion of the palm oil industry affects environmental sustainability. This study aims to assess palm oil\u27s environmental grievances reported pre- and post-Covid-19. A hybrid of data-driven and multicriteria decision-making analyses was used to analyze unstructured data from nine companies\u27 grievance logs. A total of 884 cases with the trend peaking in 2019. Predominantly deforestation, a total of 564 cases affecting ~66,716.23 ha in Indonesia, 312 cases affecting ~49,704.97 ha in Malaysia, 6 cases affecting ~43,500 ha in Papua New Guinea, and 2 cases in the Philippines. Network analysis reveals that the environmental grievances affected multiple companies, with WILMAR suppliers at the center. On average, companies take ~100 days to resolve. Clustering analysis shows Sime Darby Oil, WILMAR, KLK, and Mewah Group have influences on addressing grievances in high-risk provinces. Quantile-quadrant analysis reveals that provinces in Kalimantan, Pahang, and Sarawak are in the high-risk quadrant and therefore require immediate mitigation plans. This finding points toward the need for the formation of a private consortium among identified key players and local government in the high-risk region as a new strategy to improve management of environmental sustainability issues that predominantly involve deforestation.
 
Wildlife Trade in East Nusa Tenggara Province Based on Facebook Social Media Groups
Full text linkWildlife conservation is fundamental to mitigating the extinction due to wildlife trade. Thus, various conservation policies have been used as a reference: IUCN, CITES, and Government Policy P.106 of 2018. This research aims to record Facebook-based wildlife trade, identify the traded wildlife conservation status, and estimate the selling price. Data was taken since the group was formed until 1 July 2023. The results reveal that 107 species belonging to 53 families were recorded in 31 trading groups, comprising 82 species of aves, 17 species of herpetofauna, and eight species of mammals. Among those traded wildlife, based on P.106, 80 species are unprotected, while 27 are protected. Based on the IUCN, most traded wildlife is categorized as LC with 77 species. Some species are categorized as CR with four species, EN with 9, VU with 8, NT with 8, and NE with one species. Referring to CITES, 73 species classified as non-appendices dominate the trading groups, followed by 24 species of Appendix II, 9 of Appendix I, and 1 of Appendix III. The estimated selling price of all traded wildlife is approximately IDR 317,125,000. Governments and other conservation bodies must pay more attention to the growing Facebook-based wildlife trade, especially for protected and endangered species
Factors Influencing Non-Timber Forest Products on Household Welfare in Maraba Sector, Huye District, Rwanda
Full text linkNon-timber forest products (NTFPs) enhance rural household income. In Rwanda, natural forests cover 11.9% of the land and are key for biodiversity conservation, providing water catchment protection, tourism, medicinal plants, honey, and handicraft materials. Despite the forest sector\u27s economic potential, rural residents dependent on NTFPs face challenges, leading to high unemployment and poverty. This research examines how socio-economic factors affect Huye district NTFP collectors\u27 welfare. Using multi-stage sampling, 152 participants were selected, and data was collected through structured questionnaires in 2022. Data analysis used SPSS version 29 and STATA version 16 for multiple linear regression. The research identified NTFPs including fruits, vegetables, honey, traditional medicine, mushrooms, building materials, bush meats, art crafts, fuel, forage, and fodder. The main reasons for NTFP participation included food provision, income generation, education and health expenses, obtaining forage and fodder, building materials, and traditional medicine. Factors like distance to forest, training, extension services, credits, and market information significantly influenced household income. The study recommends increasing forestland allocation for NTFPs and implementing agroforestry systems to boost household income. Reforestation and afforestation initiatives should enhance forest conservation and biodiversity. The Ministry of Lands and Forestry and stakeholders should establish payment systems for ecological services benefiting community resident
Wildlife Value Orientations towards Hunting among Communities in Bintulu, Sarawak: A Comparison of the Demographic Factors
Full text linkCommunities living near forest areas have long hunted wildlife for food and other products. Among the communities in Bintulu, Sarawak, traditional hunting and the consumption of wildlife meat are deeply ingrained in their culture. This study identifies the wildlife value orientation among communities in Bintulu, Sarawak, and compares their values with demographic factors, including gender, residency, age, and education level. A survey was developed to identify the communities\u27 value orientation towards hunting, specifically the utilitarian, cultural/traditional, and conservation values. A total of 413 residents were surveyed, including individuals with knowledge of hunting practices and those who consume wildlife products, even if not active hunters themselves. Findings revealed that communities in Bintulu hold multiple values towards wildlife hunting, with a stronger tendency towards conservation values. When the demographic factors were compared, males exhibited stronger utilitarian and cultural/traditional values. Rural residents displayed higher utilitarian and cultural/traditional values, yet they also had stronger conservation values. Communities aged 40 and above displayed higher utilitarian, cultural/traditional, and conservation values. Those with lower levels of education, including primary and no formal education, show stronger conservation values than those with tertiary education. These findings emphasize the diversity of perspectives toward wildlife use and highlight the need for conservation strategies that align with local cultural contexts. Balancing traditional practices with ecological sustainability offers a more inclusive and region-specific approach to wildlife management and conservation policy.