Jurnal Manajemen Hutan Tropika
Not a member yet
600 research outputs found
Sort by
Variation of Phenology of Flacourtia rukam in Two Different Habitats and Their Relation to Rainfall, Dry Days, and the Plant Water Status
Full text linkPhenological shifts in the emergence of vegetative and generative parts, occur due to the response of plants to water received due to climate change. The rukam tree (Flacourtia rukam (Zoll & Moritzi)) is a local Indonesian plant with potential as an edible fruit and antioxidant agent, but its existence is increasingly rare. F. rukam can be found in Pasuruan, East Java, including Purwodadi Botanical Garden (PBG) as collected plants and Sekarmojo Village as cultivated plants. These populations show a shift in phenology, but this has never been studied. This study aimed to analyze the spatial variation of the phenology of two rukam populations and its relation to plant water status, rainfall quantity (RQ), and drought days (DD). This research was conducted on two individual trees at each location, was conducted from August 2020 to October 2022 using secondary data from BMKG, such as daily rainfall and the number of days without rain. Phenology was directly observed every week with an estimated abundance of numbers 1-4; plant water status was observed by calculating relative water content (RWC); soil physical analysis was carried out in mid-season. Data were analyzed by Mann-Whitney test and SEM WarpPLS. The results showed differences in phenology in the phases of leaf fall, flower buds, young fruit, and ripe fruit on the trees in the different locations. The decreased RQ in the past month significantly reduced the RWC value of F. rukam in both places, while the number of DD contributed to a decrease in the RWC value in PBG only, not in Sekarmojo. In both sites, decreasing the RWC of the rukam increased the abundance of fallen leaves and the chances of flowering. Rainfall and drought days affected plant phenology directly or indirectly through RWC mediation. In both places, RQ had a direct positive and significant effect on blooming flowers and new leaves but had negative effect on fallen leaves. While DD had a positive effect on leaf fall, flower formation, and fruit ripening, but had a negative effect on the appearance of young fruit (in PBG). Indirectly, RQ mainly affected several phenological parameters, while DD did not affect all phenological parameters
Development of Land Cover and Carbon Storage in Plawangan Hill of Gunung Merapi National Park, Yogyakarta, Using Landsat Data Series 2009, 2013, 2017, and 2023
Full text linkGlobally, habitat loss, deforestation, and climate change are mostly caused by land cover changes (LCC). The amount of land covered by trees has had a major impact on global warming and climate change. Increasing the amount of land cover helps to mitigate climate change and global warming. This study aims to investigate the changes in land cover and carbon storage in Plawangan Hill, Indonesia, over four years (2009, 2013, 2017, and 2023). The study site was defined as a conservation area that has been periodically impacted both directly and indirectly by volcanic eruptions. Images from Landsat 7 and 8 were used to collect data. Additionally, land cover changes were assessed using the forest canopy density (FCD Mapper) model, which was then utilized to quantify the carbon storage of the research site. The findings demonstrated fluctuations in land cover changes between 2009 and 2023. Additionally, changes in land cover have a direct impact on changes in carbon storage. The age of the trees, type of vegetation, succession stage, and history of eruptions were the variables that were apparent to be the main causes of these changes
Growth of Betung Bamboo (Dendrocalamus asper) and Food Crop Production Under Agroforestry Bamboo Systems
Full text linkOne of the main species in community forests is betung bamboo (Dendrocalamus asper). Optimizing land use under bamboo can be achieved by cultivating food crops. This research aimed to determine the growth of betung bamboo and the production of food crops. The experimental design used a split plot design with four cultivation patterns as the main plots: agroforestry bamboo pattern i.e. agroforestry bamboo + rice (P1), agroforestry bamboo + rice + cassava (P2), agroforestry bamboo + rice + taro (P3), and mixed food crops (rice + cassava + taro) (P4), while the subplots were rice varieties: rindang 2 (V1), protani (V2), and unsoed (V3). The observed parameters were bamboo growth, soil fertility, and food crop production. The results showed that seven-year-old betung bamboo had an average of 6.01 mature stems per clump, an average plant height of 7.23 m, and a stem diameter of 7.12 cm. The numbers of young stems and shoots per clump was 1.45 and 3.71. The highest betung bamboo growth was in the agroforestry pattern (length: 8,49 m, diameter: 7.17 cm, thickness: 1.95, total weight: 21.31 kg). The highest rice yield was observed in the P2V1 treatment (4.17 kg). The highest cassava tuber yield per plant was observed in P4 (2.12 kg). The taro tuber yield was relatively higher in the agroforestry pattern with a distance of >1 m from the bamboo clump (0.52 kg plant-1). The land equivalent ratio (LER) and area time equivalent ratio (ATER) of bamboo and food crop agroforestry have a value above 1, so it is more efficient in land
The Performance of Legume and Non-legume Trees under Dry Karst Areas
Full text linkKarst areas in Indonesia are arid landscapes with water-use limitations because of dissolved carbonates. Long-term water scarcity stunts plant growth and often kills them. For tropical karst forestry-greening, the three best legume and three best non-legume species from a previous trial comprising 20 species were compared. Since October 2011, seedlings of the top three non-legume, species Aleurites mollucana, Sterculia foetida, and Alstonia scholaris, and three legume species, Acacia auriculiformis, Cassea seamea, and Acacia mangium, have been grown for four months. In January 2012, field trials were established at two dry karst locations, i.e., Pracimantoro, Central Java, and Bunder, Gunung Kidul Yogyakarta. A randomized block design was used to raise 1.764 seedlings at the two sites with 7×7 plots, 3×3 spacing between trees, and three blocks. After 10 months, legumes and non-legumes differed greatly in all growth parameters. These disparities lasted up to 30 months, when trees should have adapted to their new surroundings. After seven years of planting, legume trees raised the soil\u27s organic matter concentration from low to medium, making it more fertile, similar to soil from intensive agricultural regions. Thus, early or mixed legume plantings on tropical karst sites may aid in better re-greening than the establishment of non-legumes.
 
Expedition and Characterization of the Corpse Flower (Amorphophallus titanum (Becc.)) in West Sumatra
Full text linkThe corpse flower (Amorphophallus titanum Becc.) is an endemic flora of Indonesia that is naturally found only in Sumatra. The status of A. titanum is endangered because of several factors: deforestation, tuber exploitation, long flowering time, and protogyne. Until now, there has been no research about the population and distribution of A. titanum in West Sumatra. This study aimed to obtain information about the population and distribution of A. titanum in West Sumatra, so this research is essential to learn. The research used roaming and snowball sampling methods in Solok Selatan and Sijunjung Regencies in September-October 2022. The research was conducted by recording the coordinates where A. titanum was discovered, marked using GPS, and collecting morphological characteristics. The results showed that exploration in the Solok Selatan District found 19 corpse flower individuals (18 species of A. titanum and one species of A. gigas). In contrast, exploration in Sijunjung Regency managed to found 25 species of A. titanum. The corpse flowers found were in vegetative, dormant, flowering, and fruiting phases. The results help record the number and distribution of A.titanum in West Sumatra. The ex-situ conservation program will use germplasm as propagation material in the future
Are the Physical and Social Capitals Still Productive Resources for Coffee Agroforestry Development?: The Evidence of Endogenous Growth Role in Leveraging the Sluggish Production Factors at Batutegi Forest Management Unit
No full textIncreasing income (INC) is a key variable for the encroacher\u27s self-empowerment in order to able to leave protected forest areas voluntarily when their concessionary period will be due. This urgency is facing by almost Social Forestry Programs across the country such as for Batutegi Lampung Province, whose empowerment period only has 20 years left so that they don\u27t become encroachers again. While physical capital (PC), especially forest land, has seemed leveling off for increasing INC, so the stimulating social capital (SC) is a must. In this context, the role of extension activities (ROLE) in amplifying PC and SC productivity in leveraging INC needs to be elucidated. The objectives of this research are to: (1) reveal the strengths of the direct effect of ROLE on INC, (2)compare the effectiveness of ROLE in leveraging SC to PC in order to increase INC, and (3) evaluate the effectiveness of ROLE in stimulating FC and SC in order to leverage INC. The SEM (structural equation modeling) postulates employed at a confidence level of 95%, where PC and SC are treated as exogenous variables, ROLE as intervening variables, and INC as endogenous variables. The land tenure both inside and outside the forest area is used as an indicator for the PC. Elements of norms, trust, and network as indicators for SC. The three indicators for ROLE employed are the benefit of extension activities about forest protection, agroforestry technique, and post-harvest skill. Two indicators for INC are from coffee beans and other non-timber forest products (NTFP). Data collection was carried out in between April to June 2020 through semi-structured interviews with 98 forest encroachers who were drawn using stratified random sampling. Conclusion: (1) FC and SC not directly productive, did not significantly increase INC (P=0.740 and 0.123 respectively), and in contrast to ROLE were highly productive (P=0.000), (2) PC was also not significantly stimulated to ROLE (P=0.112) but SC was significant (P=0.000) and [3] for PC the ROLE activities were blunt or not significant in amplifying INC (P=0.188) but very powerful or significant for SC (P=0.000). The implication: to ensure that encroachers or HKm land concession holders are able to leave protected forest areas voluntarily when their concession rights expire, the FMU authority must increase the knowledge and skills of HKm concession holders through strengthening extension performance (ROLE) as a necessary condition for increasing income, not continuing to increase the land allotment
Navigating Conservation Access: Unraveling Ignorant Tourist Behavior and Typologies in Komodo National Park
Full text linkThe impact of access policies on the influx of ignorant behavior in conservation areas is still understudied. This research aims to detect this ignorant tourist behavior in the conservation areas by analyzing perceived accessibility and examining the tourist typologies. The study was conducted in Komodo National Park, one of the most popular destinations in Indonesia, which has experienced high accessibility development. The research method employed tourism policy and factor-cluster analysis to examine the tourist typology. Accessibility constructs and hedonic tourist motivation were used as the variables in the analysis. The total respondents were 534, and the data were analyzed using a non-hierarchical K-means cluster analysis. The result showed that three aspects were considered in managing the accessibility in the conservation areas. The aspects included destination, individual, and conservation accessibilities in the national park. Further, four tourist typologies were found in this research. Two new typologies, hedonistic adventure tourists and high-risk hedonistic tourists, indicated ignorant behavior. Two others, such as real ecotourists and nature-relaxing tourists, presented general nature-based tourist characteristics in the existing literature. The managerial implications of this research are providing practical insights for planners and destination managers to improve conservation awareness for remarkably ignorant tourists.
 
Growth, Yield, and Stem Quality of Tectona grandis Grown with Different Spacings at Longuza Forest Plantation, Tanzania
Full text linkSpacing is a silvicultural practice that affects the growth of trees in forest plantations. However, the yield depends on growth, which is determined by spacing. In addition, spacing influences the quantity of the final crop available for harvesting, specifically in forest plantations for sawlog production. Spacing is also used as a management practice to control the quality of trees, as dense stands are expected to have trees with good stem quality. However, little has been done to address the effects of spacing on the growth, yield, and stem quality of Tectona grandis until final harvesting age. Teak plantations in Tanzania are grown at a rotation age of 20 years. Thus, this study aimed to assess the effect of spacing on the growth, yield, and stem quality of 24-year-old T. grandis in a Longuza Forest plantation in Muheza, Tanzania. Data were collected from a spacing trial using a randomized complete block design with three treatments: 2 m × 2 m, 3 × 3 m, and 4 m × 4 m, with three replications. The growth and yield parameters assessed were diameter at breast height (dbh) total tree height, and stem quality. Data were analyzed to obtain the basal area, volume, and mean annual increment. Statistical analysis was performed using analysis of variance (ANOVA), and multiple comparisons among treatment means were performed using Tukey\u27s honest significant difference test (p-value = 0.05). The results showed that spacing did not significantly affect growth and yield parameters. The stem quality was significantly different in some treatments. The highest dbh and height growth were observed at 4 m× 4 m spacing. The highest values of basal area, volume, and mean annual increment were observed at a 3 m× 3 m spacing. Stem quality differed significantly between the 2 m× 2 m and 4 m× 4 m spacings. Because teak plantations in Tanzania are aimed at sawlog production, it is recommended to continue practising a spacing of 3 m× 3 m, which will ensure a higher mean annual increment with a higher volume at the stand level. In addition, a spacing of 3 m × 3 m ensured a higher percentage of trees with good stem quality
Land Use, Built-Up, and Vegetation Index in North Halmahera Regency through Spatio-Temporal Analysis
Full text linkMonitoring land use, buildings, and vegetation index of ecotourism areas in North Halmahera can support planning space utilization in urban areas for tourist areas as the concept of land use management and urban planning. This study offers ideas for analyzing the distribution of buildings, vegetation index, and land use in the mangrove ecotourism area of North Halmahera Regency using the spatio-temporal analysis method. The spatio-temporal analysis method comprises several stages: data selection, preprocessing, data integration, spatial analysis, temporal analysis, spatio-temporal analysis, data visualization, interpretation and understanding, and data visualization. The results of this study show that changes in the livelihood strategy of local people, from farmers and fishermen to traders, also affect land use patterns, from agricultural activities to economic activities, which triggers an increase in the number of buildings for production activities to product distribution. The implications of these findings on ecotourism development programs and policies and infrastructure development in the North Halmahera Regency are to consider community livelihoods and space or land use behavior in ecotourism areas based on vegetation, soil, and building index values. Thus, the intensification of building distribution and changes in vegetation index values from 2013-2023 reflect changes in people\u27s livelihood strategies from agrarian activities to trade and from fishermen\u27s activities to tourism transportation service providers.