Jurnal ForestrIndo

FAKTOR-FAKTOR YANG MEMPENGARUHI PRODUKTIVITAS PENYADAP GETAH PINUS DI KPH SUKABUMI, PROVINSI JAWA BARAT

Ardya Hwardaya Gustawan, Bramasto Nugroho — Fri, 20 Dec 2024 00:00:00 +0700

The increase in pine resin production depends on the productivity of tappers. The factors that affect the productivity of tappers include age, number of family members, working hours, wage incentives, and the load of trees that must be tapped. This study aims to analyze the factors that affect the productivity of pine resin tappers in KPH Sukabumi. The research was conducted using quantitative analysis methods with interviews using questionnaire. Sampling was determined using the purposive sampling with number of samples was 60 samples. Data analysis using multiple linear regression methods. The results showed that the number of family dependents, working hours, and the wage incentives had a significant effect on the productivity of tappers with an R Square value of 98.49%. Meanwhile, the age and load of trees that must be tapped had no significant effect on the productivity of tappers. The age factor is inversely proportional to productivity, meaning that the higher the age, the lower the productivity level. While other factors analyzed are directly proportional to the level of productivity.

PRODUKTIVITAS DAN BIAYA PEMANENAN KAYU MANGIUM (Acacia mangium) DI BKPH PARUNG PANJANG KPH BOGOR

Sarwinda Agustin, Juang Rata Matangaran — Fri, 20 Dec 2024 12:43:02 +0700

The rising demand for wood has outpaced the production capabilities of Perhutani. This study analyzes the productivity and costs associated with forest harvesting. Productivity was measured by calculating the volume of wood and the work time for each stage of the harvesting process: felling (31 cycles), skidding (49 cycles), and transporting (11 cycles). We compared the costs incurred by workers with those incurred by Perhutani. Our findings reveal effective productivity rates of 26.32 m³/day for felling, 21.40 m³/day for skidding, and 19.8 m³/day for transporting. However, the actual productivity for these stages is only 5.54 m³/day. Harvesting in BKPH Parung Panjang operates under a contract system, where low productivity increases total worker costs. The costs incurred per cubic meter by fellers, skidders, and transporters are Rp32,030.55, Rp4,338.04, and Rp67,628.72, respectively. In comparison, the wages they receive are Rp35,000/m³, Rp16,666.67/m³, and Rp70,000/m³. The narrow margin between wages and expenses raises concerns about the welfare of these workers.

PENGGUNAAN STIMULANSIA DALAM PENYADAPAN PINUS KELAS UMUR V DAN VI DI PANINGGARAN, PEKALONGAN TIMUR

Ryan Darmawan, Juang Rata Matangaran, Gunawan Santosa — Fri, 20 Dec 2024 14:04:36 +0700

The Forest Management Unit (BKPH) Paninggaran, East Pekalongan falls under the pine enterprise-class, where pine resin is the main commodity. Consequently, the productivity of pine resin is highly regarded. The process of resin extraction during tapping is generally aided by stimulants. In practice, BKPH Paninggaran uses both organic and inorganic stimulants. Despite using different stimulants, BKPH Paninggaran has yet to determine which stimulant is the most effective and efficient. This study analyzes the productivity and added value of pine resin tapping when applied stimulants. The research method used a completely randomized design with a two-factor factorial. The first factor is the use of five types of stimulants. The second factor is age class V and VI. The stimulant that resulted in the highest resin productivity was the stimulant with active ingredients of ethylene and citric acid plus 5% sulfuric acid, with an average productivity of 12.98 g/quarre/day, representing a 76.44% increase in resin yield compared to the control (7.36 g/quarre/day). The productivity of pine resin in age classes V and VI did not differ significantly, being 10.13 g/quarre/day and 9.97 g/quarre/day, respectively. There was no interaction between the stimulant factor and the age class. The highest added value of the stimulant was found in the stimulant with active ingredients of ethylene and citric acid plus 5% sulfuric acid, amounting to Rp 52.76/quarre/day.

PENDUGAAN PEUBAH POHON DAN PEUBAH TEGAKAN JATI MENGGUNAKAN CITRA UNMANNED AERIAL VEHICEL (UAV) DI KPH RANDUBLATUNG

Fri, 20 Dec 2024 14:16:46 +0700

Forest inventory using remote sensing is an alternative to taking data in the field precisely and quickly. This study aims to identify the ability of UAV imagery to estimate the variables of teak stands of age class XIV with a flight altitude of 90 meters in KPH Randublatung. The method of data collection in the field is to make a plot in the form of a square with a size of 80 m x 80 m by purposive sampling based on slope level criteria. The aerial photography data was processed using PIX4Dmapper and ArcMap 10.5 software to produce the Canopy Height Model (CHM) and crown delineation. Tree variables, such as tree height can be estimated by visual height from CHM with R² 0,777, tree diameter and crown diameter can be estimated by visual crown diameter with R² respectively 0,460; 0,475. Stand variables, such as stand height, can be estimated by visual average estimated height from CHM with R² 0,826. Stand diameter, crown diameter, stand base area, and number of trees can be estimated by visual average crown diameter with R² respectively 0,486; 0,464; 0,478; 0,342. Therefore, UAV Imagery can estimate tree variables and stand variables of XIV age class teak in KPH Randublatung.

EROSI TANAH PADA AREAL TANAM RUMPANG DAN HUTAN ALAM TERDEGRADASI DI PT. SARMIENTO PARAKANTJA TIMBER

Elias Elias, Olga Amelia Elfadilla Sy — Fri, 20 Dec 2024 14:32:41 +0700

Gap Planting and Gap Cutting (TRTR) is a silvicultural system that utilizes the phenomenon of natural forest succession by planting fast-growing species in gap areas. TRTR is expected to increase productivity in degraded natural forests. This study aims to determine the rate of soil erosion in the gap planting research area and degraded natural forest at PT. Sarmiento Parakantja Timber. The research was conducted on two slope classes: flat-gentle and moderate. The methods used in the study consist of the erosion stick method, ANOVA, and independent statistical tests. The study results show that the highest soil erosion occurs in degraded natural forest areas, followed by the erosion in barrier areas and in the planting strips. The statistical test results show that soil erosion in degraded natural forest areas, erosion in barrier areas, and in planting strips is significantly different. Similarly, the effect of flat-gentle slopes and moderate slopes on the extent of erosion in gap areas is also significantly different. However, the amount of erosion occurring in degraded natural forest areas and gap areas is not significantly different.

PENYUSUNAN DAN VALIDASI MODEL ALOMETRIK BIOMASSA POHON EUKALIPTUS HIBRIDA DI UNIT PENGELOLAAN HUTAN TANAMAN DI SUMATRA UTARA

Rose Ananda Mutiara Kansil, Muhdin, Ronald Hot Marnaek — Fri, 20 Dec 2024 14:45:10 +0700

Information on tree biomass potential is closely related to the ability of vegetation to absorb CO2, which is one of the pollutants that can cause the greenhouse effect. Eucalyptus is one of the tree species cultivated in industrial plantation forests in Indonesia, with a relatively short rotation period (3–5 years), and can act as a carbon dioxide absorber. This study aims to develop an allometric model to estimate the total biomass of hybrid eucalyptus trees in a plantation forest management unit in North Sumatra. The sample trees used in this study included 75 trees with diameters ranging from 1.46 to 17.52 cm. The allometric models were developed using CurveExpert Basic 2.2.3 and RStudio 4.4.0, resulting in five selected models: power (M1), exponential (M2), polynomial (M3), rational (M4), and Hoerl (M5). Subsequently, these five models were validated, also involving two others previously existing allometric models at the same site, ultimately resulting in model M1 (W = 0.08378D^2.49572) as the best model. This model, based on this study, demonstrated better accuracy compared to other allometric models for estimating the biomass of hybrid eucalyptus trees at the study site.