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INDONESIA
MANAJEMEN HUTAN TROPIKA Journal of Tropical Forest Management
Published by Institut Pertanian Bogor
ISSN : 20870469     EISSN : 20892063     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Jurnal Manajemen Hutan Tropika is a periodic scientific articles and conceptual thinking of tropical forest management covering all aspects of forest planning, forest policy, utilization of forest resources, forest ergonomics, forest ecology, forest inventory, silviculture, and management of regional ecosystems.
Arjuna Subject : -
Articles 547 Documents
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Soil Compaction by Valmet Forwarder Operation at Soil Surface with and without Slash Juang Rata Matangaran
Jurnal Manajemen Hutan Tropika Vol. 18 No. 1 (2012)
Publisher : Institut Pertanian Bogor (IPB University)

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Abstract

Soil compaction by machine used in forest harvesting operation caused negative impacts for regeneration and tree growth. This research was intended to analyze the effectiveness of using slash to decrease soil compaction, to analyze soil compaction at various soil depths, and to measure rut depth at soil surface. Valmet 860.1 forwarder was used in this research. Soil compaction was measured through its bulk density, cone index, and rut depth, under the condition with and without slash. The slash comprised of twigs, branches, and leaves as wastes from harvested Acacia mangium that were stacked to a width of about 1 meter in thickness following forwarder traffic. Results indicated that slash was effective in decreasing soil compaction. About 50% increased in soil compaction by a Valmet forwarder could be reduced by using slash coverings at soil surface. The maximum soil bulk density occurred after 5 forwarder passes. Soil compaction also occurred at subsurface soil. After forwarder traffic, increasing cone index was observed at subsurface of various soil depths. Slash was effective in decreasing soil compaction up to 20 cm in soil depth, although soil compaction by forwarder operation was slightly increased until 50 cm of soil depth. Rut was not observed under the slash however rut of about 24 cm in depth was formed at soil surface without slash. Using slash as coverings for forwarder operation reduced soil damaged.
Types of Forestry Charges from Natural Resource Economics Perspective Sudarsono Soedomo
Jurnal Manajemen Hutan Tropika Vol. 18 No. 1 (2012)
Publisher : Institut Pertanian Bogor (IPB University)

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Abstract

Capturing economic rent from natural resources, particularly forests, frequently still creates disagreement between the government and businesses. The charges imposed by the government in the forms of reboisation fund (DR) and forest resource provision (PSDH) have been in place for very long time, accepted by all stakeholders, and supported by laws. Government policy regarding compensation for forest stand value (GRNT) creates controvercies. This paper intends to clarify problem of forest charges by returning it to its fundamental theories, e.g. economic theory of natural resouces. Economic rent of forests that are controlled by the government is the right of all Indonesia people. Henece, the government has responsibility for capturing the rent as much as possible in the most efficient way. If the stumpage is too low then it potentially promotes overcutting, whereas if it is too high then it makes forest business less attractive that potentially promotes illegal activities. In forestry, economic rent of forest has a special name, it is stumpage price. There are some difficulties in estimating a competitive stumpage price, wheter the one obtained through a direct competitive auction of standing timber or through calculation of residual price. Partly, the difficulties were generated by the government’s own policies that strongly distorted log prices. Log export ban and vertical integration are the two most influential policies in distorting log prices. Actually, the government is able to design and implement a single charge to capture PSDH, DR, and GRNT so that their administration becomes much simpler and more efficient.
Flower Initiation, Morphology, and Developmental Stages of Flowering-Fruiting of Mindi Dida Syamsuwida; Endah Retno Palupi; Iskandar Zulkarnaen Siregar; Andry Indrawan
Jurnal Manajemen Hutan Tropika Vol. 18 No. 1 (2012)
Publisher : Institut Pertanian Bogor (IPB University)

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Abstract

The study was aimed to determine flower initiation, floral morphology and to observe the stages of flowering and fruit development of mindi (Melia azedarch L) within a population for one period of time 2008–2009. The methods used were observing directly over the trees and some vegetatives and generatives buds were sampled for dissecting. The observation revealed that the inflorescence type of mindi was panicle, located at the end of a branch. The number of flower varied among inflorescences, ranged between 30–80 that bloomed simultaneously. The flower was hermaphroditic with position of anther was closed to stigma that selfing might be happened. Usually, the ovary contained 5 ovules that developed into seeds. Reproductive cycle was proceeded for 6–7 months within the year, first observation commenced from flower initiation that occur in August, generative buds to flower burst in September–October. Early fruits were formed in October–November and fruits reached physiological-maturity in January–February. Reproductive success was 34%, indicated that the rate of fertilized ovules proportion to be potencially viable seeds were relatively low.
Study on Impact of Agroforestry Model to the Growth of Teak (Tectona grandis L.F) Plants Nurheni Wijayanto
Jurnal Manajemen Hutan Tropika Vol. 13 No. 2 (2007)
Publisher : Institut Pertanian Bogor (IPB University)

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Abstract

The objective of this research was to learn effect of agroforestry pattern on the growth of teak crops and the other crops. The research was conducted for 1 year in teak forest stand (1 years old) with site quality index (bonita) was 3.5. Experimental design with 10 observations per block.Blocks in this research were agroforestry pattern 1 (intercropping during the whole cycle of the main crop) and agroforestry pattern 2 (temporary intercropping). There were 2 treatments: (1) litters of corn crops were put on rows of teak crops and no fertilizers were added,(2) fertilizers were added, but litters of corn crops were taken away, and (3) fertilizers were added, and litters of corn crops were put on rows of teak crops. Area size of each observation plat was 0.05 ha. Analysis of variance on the average increament of total height of teak crop and production of dry kernel (corn seeds which had been detached from corn cob) that showed significant results were further analyzed by the use of Duncan Least Significant Difference Test. Conclusions of this research were: (1) agroforestry pattern 1 had greater effect as compared to agroforestry pattern 2 on the growth of total height of teak crop, (2) agroforestry pattern 1 had greater effect as compared to agroforestry pattern 2 on the production increase of dry corn kernels.Keywords: agroforestry, intercropping, analysis of variance, total height, production
Estimating the Potential of Merchantable Timber and Firewood of Sengon in the Community Forest of Bateh Village, Magelang Ris Hadi Purwanto; Abdul Rachman Suryo Pratomo
Jurnal Manajemen Hutan Tropika Vol. 13 No. 2 (2007)
Publisher : Institut Pertanian Bogor (IPB University)

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Abstract

The potential of merchantable timber and firewood of Sengon (Paraserienthes falcataria) in Desa Bateh community forest were estimated by developing allometric equations method. To establish the allometric equations 400 sample trees were measured to determine the relationships between tree heightt (H) and diameter at breast height (D). Twenty trees of various sizes were cut to measure the merchantable timber and firewood volume. The raw merchantable timber volume of sengon (Paraserienthess falcataria) in the community forest was defined as the ligneous material contained in the bole and branches which both a diameters of at least 10 cm. The results showed that D (taken at about 1.3 m above the ground) was a good predictor of H with r2 value over 0.9141. When D was combined with H, r2 was improved somewhat for the merchantable timber and firewood volume, suggesting the growth pattern of tree dimensiions were closely interdependent. A standing stock of the merchantable timber and timber and firewood volume of sengon in the community forest was then estimated based on allometric relations. Proportions of the merchantable timber and firewood volume were 70,84% and 29,16% of total wood volume per tree, respectively, with a basal area of 13.620 m2/ha. Based on th basal area, Desa Bateh community forest could be classified into dense stands category.
Modeling of Forest and Land Fires Risk Level and Zone Using GIS in Kapuas Tengah Sub Basin, West Kalimantan Province Iin Arianti; Naik Sinukaban; I Nengah Surati Jaya
Jurnal Manajemen Hutan Tropika Vol. 13 No. 2 (2007)
Publisher : Institut Pertanian Bogor (IPB University)

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Abstract

In the last 2 decades, forest and land fires in Indonesia have become a serious problem at national, regional, and even international levels. The smoke of the fires gave a negative impact on human activities and health and in turn coused economical and social loss. In addition, the haze pollution has become a serious problem internationally. This study was conducted to establish a risk model of forest and land fire in Kapuas tengah watershed, Kalimantan Barat Province. The model was based on scoring and weighting of bio-phisycal and human activity factors. Rangking method and Composite Mapping Analysis (CMA) were used to establish the model. The result showed that the accuracy of model by ranking method to determine the risk level and zone of forest and land fire was only 62,4% in Kapuas Tengah watersheed. Therefore, the model was not good enough to represent actual condition in the field. The accuracy of model using CMA method could be used to determine risk level and zone of forest and land fire. The CMA method showed that the Kapuas Tengah watershed consisted of 1,051,029.4 ha high risk, 379,307.0 ha of moderate and 195,010.7 ha of low vulnerable. The risk map can be used for early warning system to prevent forest and land fires.Keywords: forest and land fires, composite mapping analysis, rangking method, fire risk map
The Change of Fat, Protein, Starch Contens and Electric Conductivity within Gaharu (Aquillaria malaccensis) Seeds Dida Syamsuwida; Aam Aminah
Jurnal Manajemen Hutan Tropika Vol. 13 No. 2 (2007)
Publisher : Institut Pertanian Bogor (IPB University)

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Abstract

One of the symptomps of seed ageing is broad changes of biochemical content within seeds which is causing the decrease of decrease viability, eventually. The aim of the study was to determine the change of Aquillaria malaccensis seeds biochemically during storage and desiccating. There were two trial in this study: 1) decreasing seed moisture content by desiccations for 6, 12, 18, 24, and 48 hours and 2) storing the seeds conventionally in two different condtions of storage (ambient room and air conditioner room). Since the moisture content of fresh seed on acceptance was low (15,9%) due to the delaying during transportation, reducing moisture content of the seed brought about the decrease of germination capacity down to zero. The content of protein, fat and starch of the seeds during desiccation and storage were mostly  changes which were indicating the deterioration of the seeds. The content of fat of fresh seeds was high (46,2%) and tended to remain high during desiccating. Meanwhile, the content of protein tended to increase and starch was decreased following desiccation. The content of fat and protein tended to increase and starch was decreased following desiccation. the content of fat and protein during storage weree reduced, while starch was increased for 8 weeks and then went down for the rest of storage. The electricconductivity within the seeds in both treatments (desiccation and storage) was increased which were indicating the leakage of membrane cells occured . Based on biochemical content changes, seed of Aquillaria malaccensiscould be categorized as recalcitrant type. However, to make the results more accurate it should be proved specifically by testing the physiological of seeds, simultaneously.Keywords : Aquillaria malaccensis, desiccations, fat, moisture content, protein  
Ecological Aspect of Pidada (Soneratia caseolaris Linn. Engler, 1987) at Muara Angke, Jakarta Nyoto Santoso; Cecep Kusmana; Dedi Sudarma; Rinekso Sukmadi
Jurnal Manajemen Hutan Tropika Vol. 13 No. 2 (2007)
Publisher : Institut Pertanian Bogor (IPB University)

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Abstract

Pidada (Sonneratia caseolaris Linn. Engler, 1987) and parepat (Sonneratia alba J. Smith) are central genetic of species and genus Sonneratia.  Hight growth plant of pidada was 18.5-42 cm/month, and diameter growth of trees was 1.75-3.45 cm/month, roots growth was faster (10-20 cm/ 16 month) on substrads with deep mudy (> 1 m) depenth of substrats with sallow mudy or hard soils. Presentase of life plant pidada (spacing 1 x 1 m) was 70 % (trees age was 6 months), 60 % (1 years) and 18 % (6 years).  Seeds number of pidada fruits was723 - 1,768 seeds/fruits. Pest of pidada plants usually species of insect groups that attact trees, and disease was viruses that attack on leaves.Keyword:
Effect of Corrupt Behavior of the Forestry Bureaucrats on the Forest Sustainability Sudarsono Soedomo
Jurnal Manajemen Hutan Tropika Vol. 11 No. 1 (2005)
Publisher : Institut Pertanian Bogor (IPB University)

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This article show that corrupt bureaucrats do not always result in a negative effect on the forest sustainability. Even under a certain condition, a corrupt behavior may result in a positive effect on the forest sustainability. An inappropriate policy is more important a cause of the forest sustainability than a corrupt behavior. Therefore, fixing this structural mistake needs to be prioritized in combating the forest destruction, for this structural mistake is the real primary cause of the forest destruction in Indonesia. Fixing this structural mistake is much more effective in combating the forest destruction than finding honest bureaucrats. 
Forest Structure and Spesies Compotition in Taman Raya Bukit Soeharto, East Kalimantan H R Syaukani; Cecep Kusmana; Hadi S Alikodra; Dudung Darusman; Kooswardhono Mudikdjo
Jurnal Manajemen Hutan Tropika Vol. 11 No. 1 (2005)
Publisher : Institut Pertanian Bogor (IPB University)

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The species composition and forest structure of Taman Hutan Raya Bukit Soeharto - East Kalimantan were investigated using transect method through systematic sampling with random start design. During data collection,5 transects of 20 m width and  1 km length of each in Wanariset Semboja forest complex and 10 transects in Pusrehut UNMUL and Protection Forest areas were established. The study shows that species richness of trees in those three forest complexes are relatively similar, however, the regeneration stage in Pusrehut UNMUL forest complex is relatively higher than those in another two areas.  Medang (Litsea firma),  Acacia (Acacia sp.), and Mahang (Macaranga gigantea) are dominant tree species in Wanariset Semboja, Pusrehut UNMUL and Protection Forest areas, respectively.  Mahang (M. gigantea) as pioneer species is also commonly dominated forest regeneration in Taman Hutan Raya Bukit Soeharto.   Based on tree’s  diameter distribution, those forests show balanced uneven-aged forests in which the large amount of trees are concentrated in the height class of 10 to 29 m.  Species diversity of those forests are relatively high (H > 2.5) either for seedling, sapling, pole or tree growth stages, however, those forests show different plant communities (IS < 70 %).

Page 19 of 55 | Total Record : 547

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