Forest Management Unit Research Articles

Mitigating Heat Exposure: Exploring the Role of Knowledge, Risk Perception, and Precautionary Behavior

Increasing ambient temperatures due to climate change have significantly impacted workers’ physical and mental workloads, affecting their health and safety. Promoting precautionary behaviors, especially among outdoor workers, is an effective strategy widely recommended for addressing these challenges. Precautionary behavior represents an essential protective mechanism that can be adopted at the individual level. This study explores the connections among Occupational Safety and Health (OSH), risk perception, and precautionary behavior. Descriptive statistics and Structural Equation Modeling with the Partial Least Squares approach were used to analyze the data. This study was conducted at two forest management units in Central Java and East Java, Indonesia, where daily air temperatures are relatively high. The research involved 100 respondents, comprising 50 indoor and 50 outdoor workers. The findings of this investigation reveal that OSH-related knowledge among indoor workers predicts their precautionary behavior. Nevertheless, according to the model, attempts to improve precautionary behavior through knowledge enhancement are estimated to be unsuccessful among outdoor workers. Nonetheless, OSH-related knowledge can facilitate workers in developing a more realistic perception, especially regarding the “dread risk factor” among forestry workers, which can positively impact their precautionary behavior. Keywords: forestry worker, heat exposure, mediation analysis, occupational health, psychometrics paradigm

Analysis of the Dynamics of Vegetation Cover and Land Use in Forest Management Unit 00-004 and its Surroundings on the Coast of Cameroon

In Cameroon, the government gives serious attention to protect Forest Management Units (FMU). Unfortunately, vegetation cover of FMU 00-004 decreases in the area as years ago due to anthropogenic pressures. The present study aimed to analyse the dynamics of the vegetation cover and land use of the FMU 00-004 and its surroundings in Cameroon, in the period between 1988-2020. Landsat images (1988, 2001 and 2020) and field investigations were used and processed by ENVI 5.3 software. 175 people around the forest were interviewed to obtain their perceptions on the causes of forest landscape degradation. In 1988, the FMU 00-004 and its surroundings consisted of seven types of land cover, the most important being dense forest, open forest and woody savannah. Cropland, building area, water area and eroded soil were less than 2%. In 2020, building area and croplands surface areas increased while dense and open forests cover decreased. Change in vegetation was more pronounced between 1988 and 2020 and the deforestation rate was 2.55%. The degradation main causes were settlements of the forest exploitation companies and agricultural practices. For sustainable production systems, landscape planning should be put in place by logging company to reduce Land use / Land cover challenges.

Rattan Species Inventory in Rawa Singkil Region of Conservation Forest Management Unit Area

Rawa Singkil region of Conservation Forest Management Area (KPHK) is a sanctuary for fauna teeming with an abundance of plant species. The species diversity is predominantly constituted of rattan and other non-timber forest products. This investigation seeks to compile a list of the various species of rattan found in the Rawa Singkil KPHK region. Therefore, this study was carried out in the Rawa Singkil region of KPHK were located in the Aceh Singkil Regency of Aceh Province, Indonesia. Spanning an area of 82,374 ha, this territory comprises nearly fifty percent peat ecosystem. A survey is utilized as the research strategy, with data acquisition conducted via sampling techniques. Moreover, the acquired data were subjected to descriptive analysis on the basis of morphological attributes, encompassing the following morphological characteristics: 1) the stem (including characteristics such as height, diameter, color, internode length, and thorn shape); 2) the leaf, including its length, ocrea, leaf count, leaf color, and leaf surface; 3) knee (color and outline of the knee); 4) thorn; (spine color, length of longest spines, position of spines, and length of shortest spines). Eight species of rattan were discovered in this region, i.e Plectocomia elongata Mart., Daemonorops mattanensis Becc, Daemonorops melanochaetes, Korthalsia echinometra Becc, and Calamus ornatus Blume

Stakeholders and network analyses in Tambora National Park, Sumbawa Island, Indonesia

Abstract. Anshor M, Basuni S, Arief H, Sunarminto T. 2023. Stakeholders and network analyses in Tambora National Park, Sumbawa Island, Indonesia. Biodiversitas 24: 5446-5463. The complexity of managing Tambora National Park (Tambora NP), West Nusa Tenggara Province, Indonesia poses a challenge to be overcome effectively by Tambora NP Office alone, thus the involvement of broader stakeholders is needed. These stakeholders have their respective levels of influence and interests which affect the relationship between them and Tambora NP Office. Therefore, this study aimed to identify the stakeholders related to the management of Tambora NP, and investigate their interests and influence using social network analysis. A stakeholder analysis was conducted by the following steps: (i) identifying the stakeholders, (ii) mapping the stakeholders, and (iii) assessing the relationship among stakeholders. The analysis identified 38 stakeholders related to Tambora NP management. Tambora NP Office is the primary stakeholder with the highest level of influence and interest. The relationship established in the management network of Tambora NP is still weak and centralized among several stakeholders in which Tambora NP Office is the most central stakeholder. The relationship among stakeholders is dominated by five stakeholders, namely Tambora NP Office, Natural Resources Conservation Agency of West Nusa Tenggara (BKSDA NTB), Executive Board (DP) of Geopark Tambora, Forest Management Unit (KPH) Tambora and the Environment and Forestry Provincial Service of West Nusa Tenggara Province (Dinas LHK NTB). These five institutions also dominate the proximity between stakeholders, so the information flow is not evenly distributed to all stakeholders. The weak relationships among stakeholders could be overcome by enhancing the flow of information and communication which could be facilitated by Tambora NP Office, BKSDA NTB, and DP Geopark Tambora.

A Primer on Clustering of Forest Management Units for Reliable Design-Based Direct Estimates and Model-Based Small Area Estimation

This study employs clustering analysis to group forest management units using auxiliary, satellite imagery-derived height metrics and past wall-to-wall tree census data from a natural, uneven-aged forest. Initially, we conducted an exhaustive exploration to determine the optimal number of clusters k, considering a wide range of clustering schemes, indices, and two specific k ranges. The optimal k is influenced by various factors, including the minimum k considered, the selected clustering algorithm, the clustering indices used, and the auxiliary variables. Specifically, the minimum k, the Euclidean distance metric, and the clustering index were instrumental in determining the optimal cluster numbers, with algorithms exerting minimal influence. Unlike traditional validation indices, we assessed the performance of these optimally defined clusters based on direct estimates and additional criteria. Subsequently, our research introduces a twofold methodology for Small Area Estimation (SAE). The first approach focuses on aggregating forest management units at the cluster level to increase the sample size, thereby yielding reliable design-based direct estimates for key forest attributes, including growing stock volume, basal area, tree density, and mean tree height. The second approach prepares area-level data for the future application of model-based estimators, contingent on establishing a strong correlation between target and auxiliary variables. Our methodology has the potential to enhance forest inventory practices across a wide range of forests where area-level auxiliary covariates are available.

Exploring the Ecological Benefits of Dead Wood and the Opportunities of Interpreting Dead Wood to the Public

According to the Practice Guide of Managing deadwood in forests and woodlands, all types of dead and dying trees of 10 cm or more in diameter are recognised as deadwood. Dead wood is very important to the health of the forest, and this is increasingly recognized by environmentalists and ecologists. Dead wood is thought to be vital to the health of a wood or forest because it can help to reduce soil erosion and create stability (Gamekeeperstrust, 2019). Not only is it an aspect of the nutrient cycling process, it provides a stable, slow-release nitrogen source and is thought to play an important role in carbon storage. Falling logs can also increase the soil stability of the woodland (Pupplet, n.d.). Although every forest and woodland are different, and owners and managers have different management objectives, deadwood should be considered in most situations. Current evidence suggests that, over the long term, deadwood should amount to roughly 20 m3 per hectare averaged across the forest management unit. Some management actions are general to all woodlands, but there are others which are specific to woods or areas of higher ecological value. This approach requires that areas of high ecological value be identified during management planning. The public as the target users of our future design, their attitude is also essential to integrate the characteristics of dead wood into the design of urban environment landscape.

Implications of Forest Policy Changes on Investment Program Strengthening Forest Management Unit in Central Sulawesi

The forest investment program, supported by foreign funding, aims to promote the strengthening of Forest Management Units (FMUs) in implementing decentralized forest management in Indonesia. Ten FMUs have received funding from the forest investment program since 2017, one of which is FMU Dampelas Tinombo of Central Sulawesi. This program exited in 2022. During its implementation project, Indonesia’s forestry policy is changing, as are the primary tasks and functions of FMUs. This study examined the implication of forest policy changes on the sustainability of the FMU strengthening investment program in FMU Dampelas Tinombo of Central Sulawesi Province. This study was conducted from July to September 2022. Data was collected through interviews and focused group discussions with FMU managers and stakeholders. This study showed that the forest investment program to strengthen the FMU in Central Sulawesi had been effectively implemented but had not significantly affected decentralized forest management practices. Changes in forestry policy brought about by the amendment of the Job Creation Law and its subsidiary regulations have significantly affected the program’s performance and sustainability. The business development program promoting FMU independence must be discontinued because it contradicted the FMUS’ constitutionally mandated primary responsibilities and duties. FMU should optimize the governance function in achieving community-based forest management, which includes forest planning, facilitation, and technical guidance. Keywords: Forest management unit, forest policy change, governance, performance, sustainability

Analysis of Stakeholders’ Interest and Influence in Non-Timber Forest Products Marketing: A Case Study in the Forest Management Unit Batutegi, Lampung

Stakeholders are involved in the management of the Forest Management Unit (FMU) Batutegi, including the marketing of non-timber forest products (NTFP). The performance of NTFP marketing in the FMU Batutegi currently has not provided optimal benefits, especially for forest farmers. Stakeholders have divergent interests and influence in NTFP marketing. The research aimed to analyze the interests and influence of each stakeholder and the relationship between stakeholders in the marketing of NTFP. Data collection was carried out through observation and interviews. Interviews were conducted with informants and stakeholders. The scoring method was used in this study. Data and information were analyzed qualitatively. The study results showed that the marketing of NTFP in the FMU Batutegi involves 15 stakeholders. There are 11 parties with moderately high interest and 8 parties with moderately high influence. FMU Batutegi is the most responsible party or central actor in NTFP marketing because it has relationships with important stakeholders, has the most relationships, and can control the flow of information in the network. The method’s usefulness for understanding stakeholders’ position in NTFP marketing. The study result is expected to be utilized by policymakers to facilitate cooperation between stakeholders to achieve optimal NTFP marketing performance. Keywords: FMU Batutegi, marketing, non-timber forest products, stakeholders

Modelling the potential of forest management to mitigate climate change in Eastern Canadian forests

Climate change poses a serious risk to sustainable forest management, particularly in boreal forests where natural disturbances have been projected to become more severe. In three Quebec boreal forest management units, biomass carbon storage under various climate change and management scenarios was projected over 300 years (2010–2310) with a process-based dynamic landscape model (PnET-succession for Landis-II). Several strategies varying in their use of partial cuts and clear cuts, including business as usual (BAU) (clear-cut applied on more than 95% of the managed area), were tested and compared to conservation scenarios (no-harvest). Based on simulation results at the landscape scale, the clearcut-based scenarios such as BAU could result in a decrease of biomass carbon stock by 10 tC ha−1 yr−1 compared to the natural scenario. However, this reduction in carbon stock could be offset in the long term through changes in composition, as clearcut systems promote the expansion of trembling aspen and white birch. In contrast, the use of strategies based on partial cuts on more than 75% or 50% of the managed area was closer to or better than the natural scenario and resulted in greater coniferous cover retention. These strategies seemed to be the best to maximize and stabilize biomass carbon storage and ensure wood supply under different climate change scenarios, yet they would require further access and appropriate infrastructure. Furthermore, these strategies could maintain species compositions and age structures similar to natural scenarios, and thus may consequently help achieve forest ecosystem-based management targets. This study presents promising strategies to guide sustainable forest management in Eastern Canada in the context of climate change.

통합 산림자원 관리와 디지털 산림정보 구축 지원을 위한 유역 기반 표준산림관리단위의 설정과 활용

통합 산림자원 관리와 디지털 산림정보 구축 지원을 위한 유역 기반 표준산림관리단위의 설정과 활용

CENOTIC ROLE OF INFECTIOUS DISEASES IN ABIES SIBIRICA LEDEB. STANDS IN THE SOUTH CENTRAL SIBERIA

Background. Degradation of Abies sibirica Ledeb.-dominated forests in the South Central Siberia is a reflection of the global trend of coniferous forest ecosystems decline. Nevertheless, the role of infectious diseases in coniferous forests degradation and dieback is often underestimated.
 Research aim. To assess the coenotic role of infectious diseases in fir-dominated stands in the South Central Siberia, considering the differentiation in trees.
 Materials and methods. The research was based on a survey of A. sibirica-dominated forest stands growing in Biryusinsky forest management unit of the Krasnoyarsk Krai government-owned publicly funded “Emelyanovskoye forestry”. Research methods included a detailed (instrumental) forest pathological examination, macroscopic diagnostics of tree diseases, graph analytics and statistical analysis of tree diameter distribution series, evaluation of disease manifestation indicators.
 Results. Stem rot and fir broom rust are typical diseases increasing the risk of windsnap and trees weakening. The prevalence of fir broom rust was over 10%. Rust fungus intermediate hosts in the forest floor determine the degree of damage to a stand. Fir broom rust randomly affected trees of different age and diameters. The bacterial blight in fir forests mainly affected trees of I-II Kraft classes causing their gradual dying. The bacterial blight in the study area was of low infection degree (up to 20%). The most dangerous was the root rot caused by Armillaria mellea s.l. that affected trees of different cenotic roles causing their group dieback.
 Conclusion. Dendropathogenic organisms are an important endogenous factor influencing the state of dark coniferous forests with a predominance of A. sibirica in the South Central Siberia. Their cenotic role is unequal. The most significant are pathogens causing necrosis and cancer diseases, and especially the root pathogen A. mellea, which leads to weakening and dying of a large number of trees of different status in the stand structure.

COMMUNITY-BASED RAPID BIODIVERSITY ASSESSMENT: A PRELIMINARY STUDY IDENTIFYING POTENTIAL NATURAL RESOURCES IN KOTA AGUNG UTARA SOCIAL FORESTRY, TANGGAMUS

Community-based rapid biodiversity assessment has been done initially with Gapoktanhut Lestari Sejahtera, a group of coffee farmers practises social forestry in protected forest, Sedayu, Semaka, Tanggamus, under supervision of KPH Kotaagung Utara, Tanggamus. Its aim is to identify potential natural resources in Kotaagung Utara protected forest, Tanggamus, under Kaidenren Nature Conservation Fund, in collaboration with University of Lampung and Rainforest Alliance program. Direct survey and observation were done, kobotoolbox was applied to collect the biodiversity information, the direct and indirect data of plants, animals as well as landscapes. Of 480 data input has been done by transect line from November, 2021 to February, 2022 covering 15 observed areas. The data consists of direct and indirect data of plants, animals as well as landscapes. The finding done is by local names included plants (n=78) mostly understory plant species, orchids, and ferns, small animals (n=40) include amphibians, reptiles, birds, and arthropods, indirect signs (n=11) of food remains, footprints, voices, scraps, wallowing ponds, scratches, nests, insects body remains, eggs and animals’ trail, some fungi, and landscapes. The findings shows that local community is potential citizen research resources, supporting social forestry practice and the initial building of Kota Agung Utara Forest Management Unit database

Performance analysis of Aceh forest management units in Aceh’s Forest development

Forest management and utilization in Indonesia has mandated the establishment of a Forest Management Unit as a forest management unit at the site level. The roles and functions of the FMUs are expected to be able to synergize all the basic components of the operationalization of forestry development in the context of sustainability for social, economic and ecological. This study reviewed the performance of FMUs role in Aceh. The results of the assessment of 9 criteria produce a number in the form of an index. The index value determines the performance category of FMUs where the index of 2.34-3.00 showed high performance, 1.67-2.33 FMU showed moderate performance and 1.00-1.66 showed low performance. The results of the FMU’s performance assessment in Aceh showed the range from moderate to high performance. FMUs with moderate performance are FMU Region I, FMU Region II and FMU of Pocut Meurah Intan Grand Forest Park. The FMU that is categorized as High performance is the FMU Region III. The criteria that are focused on being directed at developing FMU’s performance are mainly on the criteria for the area stability, management plans, investment mechanisms and conflict resolution.

Developing energy production from Eucalyptus urophylla plantation in dryland ecosystem at East Nusa Tenggara, Indonesia

Forest rehabilitation of Timor Island's dryland ecosystems using eucalyptus plants plays an important role in improving land cover but also in mitigating climate change and providing an alternative renewable energy source. The aim of this study is to explore the enormous energy storage potential of eucalyptus plants for commercial purposes using a high spatial resolution remote sensing approach. The Pléiades satellite imagery acquired on 10/09/2021 covering ca. 27 ha study area managed by Timor Tengah Selatan Forest Management Unit was used to identify the density of eucalyptus plants using Normalized Difference Vegetation Index (NDVI) values greater than 0.699. The density of eucalyptus plants is classified into low, moderate, and high tree density with NDVI values greater than 0.699 to 0.765, greater than 0.765 to 0.833, and greater than 0.833 to 0.901, respectively. The total potential energy production of the study area was estimated using a combination of assumed eucalyptus tree density, the calculated area of each density, and the average energy storage of individual trees. The results showed that the density of eucalyptus trees was classified as low, moderate, and high, with coverage areas of 6.8 ha, 12.9 ha, and 3.0 ha, respectively. The potential energy production of low, moderate, and high density approaches 1,103,432.33 MJ; 5,522,999.19 MJ; and 2,120,715.04 MJ, respectively, with a total estimated energy storage of 8,747,146.57 MJ. This obtained number of potential energy estimations indicates that forest rehabilitation of dryland ecosystems through eucalyptus plantations has a promising future as an alternative renewable energy source.

Validation and limitations of large-scale forest condition indicators – An example from Hungary

As the multi-scale study of biodiversity is extremely resource-intensive, proxy indicators taken from various databases are often used to answer questions on a larger spatial scale. Considering differences in the scale and methods, the application of such indicators (especially from different monitoring systems) requires careful consideration and standard methods of validation.In order to demonstrate this, we validated the results of the MAES-HU (National Ecosystem Assessment of Hungary) forest condition assessment (based on the Hungarian NFD – National Forestry Database) with thematically richer, finer-scale field data. We also examined the relationships of some MAES-HU indicators with other variables significant for nature conservation, not currently included in the NFD. We found the MAES-HU scoring was similar to the fine-scale score results in the case of tree species composition indicators, however, less so for structural indicators. The MAES-HU assessment uses the values of the NFD, averaged for forest management units, and thus tends to underestimate structural variety. This highlights a potential loss of important conservation-related information. During the examination of relationships with other indicators that are not included in the large-scale MAES-HU assessment, we found that the presence of large-diameter and old trees correlates with tree-related microhabitats and large standing deadwood, but no relationship was found for other investigated indicators (game pressure, further deadwood indicators). This highlights the need for integrating some key conservation indicators (presence of old and large trees, quantity and quality of standing and lying deadwood) into existing forest monitoring systems in order to optimise the resources dedicated to multipurpose data collection. Our study also highlights that applying indicators as proxies requires the full knowledge of monitoring methods and validated indicator-indicanda relationships.

Role Of Stakeholders In The Development Of Food From The Forests: A Case Of Gunungkidul, Indonesia

Population growth and climate change have triggered food crises in many countries. As a country with a large population with an average area of ​​agricultural land ownership of fewer than 0.25 hectares, Indonesia needs a more progressive strategy in anticipating a food crisis. Additional food production from outside agricultural land is required to meet food self-sufficiency. This study aims to map the role of stakeholders in the development of food production from forests in marginal land areas. In-depth interviews were conducted to determine each stakeholder's level of interest and influence. This paper identifies each stakeholder's relationship, the opportunities for collaboration, and the challenges faced using stakeholder analysis. The research used a case study in Gunungkidul Regency, Yogyakarta Province, one of Indonesia's marginal and food-insecure areas. The results showed that among the 13 identified stakeholders, the Forest Management Unit (FMU) of Yogyakarta Province and the Food Security and Extension Board (BKPP) of Yogyakarta Province are two stakeholders who act as key players, with a high level of interest and influence. The provincial government's role was dominant in developing food from the forest. Forest farmers, private forestry companies, and universities are less involved in the decision-making related to food security policies. The government at the district level also does not have sufficient budget and resources to maximize the development of food from the forest. However, the analysis results show that the potential for stakeholder collaboration is immense.

Current practices of conducting forest management plans in the Amazon may risk the survival of timber species.

Measurement of the recovery of wood stocks in logging areas in the Amazon helps to understand the efficiency of policies for the use and conservation of native forests. This work evaluated the effects of logging on the dynamics and production of commercial species in the short and medium term in a conservation unit in the state of Rondônia. Structural patterns of the species as a function of mortality and recruitment rates, patterns of average increment in diameter, and estimates of forest production in the short and medium term were analyzed. The study was carried out in an area designated as Annual Production Unit 2 of Forest Management Unit III of Jamari National Forest. In addition to legalized harvesting, there are reports of illegal logging in the area as of 2015. Inventory data from 2011, 2015, and 2018 were used, considering trees of commercial value with a diameter at breast height (DBH) greater than 10cm. Mortality rate, recruitment, periodic annual increment, absolute tree density, basal area, and commercial volume, by species and DBH classes, as well as the similarity of the species regarding the growth pattern. The population structure of species over the years was affected by tree mortality, mainly due to damage caused by illegal logging. Mean increment values varied by species and diameter classes, and six species represented 72% of the total volume of wood stock. It is important to review the criteria for sustainable forest production in the long term. Thus, it is necessary to promote species diversity and improve public authorities' capacity to enforce and of the private sector to comply with legislation. This, in turn, will enable the development of strategies to make the consumption of legal wood more rational.

Assessing the Sustainability of NTFP-Based Community Enterprises: A Viable Business Model for Indonesian Rural Forested Areas

Indonesia’s vast forested areas have the potential to serve as a crucial source of livelihood for local communities. However, the current contributions of these forests to community livelihoods are significantly underutilized in comparison to their potential. This study evaluates the financial performance and sustainability of community forest-based businesses operating around the forest management area of the Lakitan-Bukit Cogong forest management unit (LBC FMU). Data were collected through semi-structured and in-depth interviews with the key informants through purposive sampling. Financial viability analysis and a qualitative approach were used to assess the feasibility of the businesses. The findings revealed that all businesses show positive values for all financial indicators. From profit estimation and value-added distribution, all products are shown to be feasible. Concerning the value and supply chain, the rubber-processing industry has a remarkable flow. Moreover, small forest enterprises (SFEs) highlight natural capital optimization through multitudinous derivatives of products that could support a substantial regenerative economy, including citronella essential oil, native honeybees, rubber-based product, biochar, skewers, and liquid smoke. In addition, the multidimensional scaling and rapid appraisal for forest (MDS-RAPForest) approach generates a result based on multiple dimensions (ecology, economics, social and human resources, and institutional and administrative dimensions) showing that overall, SFEs are categorized as sufficient/quite sustainable. Furthermore, mainstreaming adaptable forest-based enterprises, jurisdiction approaches, and cross-production system strategies are also discussed. Our findings suggest that sustainable NTFP-based activities within a community context can be facilitated through interconnected market systems, appropriate price regulations, and support from stakeholders and legal frameworks.

Selected non-timber forest products (NTFPS) commodity for future green economy-based products development in Papua Province

Non-timber forest products (NTFPs) play significant roles in the daily livelihood of the forest communities’ dependence, local forest management practices, and forest resource sustainability in Papua Province. This research is designed to identify, characterize, and examine the roles of the NTFPs to local communities in Papua Province to be nominated and developed as green economy-based commodities in Papua. Document analysis, literature review, and an interview with the selected respondents are conducted to collect the data. The 7th Forest Management Units (FMU) and the 4th Forestry and Environment Branch across Papua Province will be selected as targeted research areas. The results indicated that the 21 NTFPs-based commodities were identified, and could be developed and promoted as green economy-based products. There are ranging from essential oils, agarwood, noken, mangrove derivate products, honey, coffee, masohi’s bark, sago, ginger-based products, ecotourism, palm peanuts, cocoa, fish-based products, seaweed, and others. Each FMU has candidature products commodities to be developed as green economy products, and the future development program is highly needed to be formulated.

Above-ground carbon stock estimation based on vegetation index classes of succession burnt peatland forest area in Jambi Province

KPHP Unit XIII Muaro Jambi as the forest management unit at site level has the potential as a large enough carbon sink. Given the area that reaches 107,839 hectares and has a type of peat soil, it is necessary to analyze carbon stocks in this forest area. Estimation of carbon stocks above ground level with non-destructive methods can be carried out using remote sensing technology by connecting the results of measurements in the field. Calculation of carbon stocks was calculated from biomass measurement in the field using allometric equations. The variables measured in this study were biomass stocks in sapling, pole, and tree stages. The data taken include data on diameter at breast height (DBH). The results showed that number of carbon stocks in 2022 in the sample plot based on the vegetation index (NDVI) class in KPHP Unit XIII Muaro Jambi from field measurements as follows: for sparse/low-density class, the average biomass is 23.27 tons/ha, the medium density class is 25.70 tons/ha. The last NDVI class, for the high-density class, the biomass stock is 74.62 tons/ha. Average biomass for all classes is 123.59 tons/ha and average of carbon content is 61.80 tons/ha.