Jurnal Manajemen Hutan Tropika
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Landslide Detection Technique using multidate SPOT Imageries: A case study in Teradomari, Tochio and Shitada Mura, Niigata, Japan
No full textThis study describes the use of multitemporal principal component analisys (MPCA), vegetation index differencing (VIDN) and conventional maximum likelihood classifier (MLC) for detecting landslides. The study found that the synthetic images derived from stable greenness, delta greenness and delta brightness of MPCA summarized the information of landslides effectively producing accuracy of 88% for Teradomari and 91% for Tochio and Shitada Mura. The VIDN provides relatively lower accuracies than those from MPCA, i.e., only 62.5% for Teradomari and 64% for Tochio and Shitada Mura. The MLC method also provided very low user’s accuracy, i.e. 56.9% for Teradomari and 63.7% for Tochio and Shitada Mura but high producer’s accuracies, i.e. 100% for Teradomari and 98.3% for Tochio and Shitada Mura. The study also found that the landsides that could be detected should be more than the size of spatial resolution of the SPOT imagery, i.e. 10 m x 10 m. Detecting landslides using SPOT imagery is more efficient than using only ground survey, providing an efficiency of 2.7
Estimating the Potential of Merchantable Timber and Firewood of Sengon in the Community Forest of Bateh Village, Magelang
No full textThe 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
Root Diseases Ganoderma sp. on the Sengon in West Java and East Java
Get PDFSengon tree (Paraserianthes falcataria (L.) Nielsen) currently becomes a major forest tree species widely planted by smallholders in Indonesia. The wood of this is quick growing and relatively easy to sell. However, level of plant safety sengon between crop plantations and other forestry need to be assessed considering the sengon tree is alternative host of Ganoderma spp. Studies have been conducted to know the presence and diversity of Ganoderma spp. on the sengon tree and some ways inoculation on sengon plant in the nursery. Survey of Ganoderma conducted in several locations of community forests and cacao (Theobroma cacao) plantations in West Java and East Java. Testing of genetic diversity based on RAPD technique. This conducted at the Biotechnology Research Institute of Plantation Indonesia Bogor. Inoculation testing conducted at the Faculty of Forestry, Bogor Agricultural University. The results showed that Ganoderma lucidum was found on the sengon tree and cacao plant, generally on the dead stump. The test results of genetic diversity obtained genetic similarity between G. lucidum from sengon and cacao are quite close. The results of inoculation of G. lucidum testing on seedlings sengon showed that both isolate from cacao and sengon tree able to infect a sengon tree back. The existence of sengon tree as shade plants for cacao plant need to watch out, because production cycle of sengon tree faster than production cycle of cacao plant that is protected
The Change of Fat, Protein, Starch Contens and Electric Conductivity within Gaharu (Aquillaria malaccensis) Seeds
No full textOne 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
No full textPidada (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
The Abundance of Pioneer Vegetation and Their Interaction with Endomycorrhiza at Different Land Qualities after Merapi Eruption
Get PDFEruption of Merapi volcano caused accumulation of lahar materials that led to extensive land degradation. This research was to study the population of pioneer plants and their correlation with endomycorrhiza population at different land qualities after Merapi eruption. Samples of soil, pioneer plants, and endomycorrhiza were collected from Merapi volcano, 1 year after eruption, using stratified sampling method based on plant densities, with the following categories: dense vegetation, moderately dense vegetation, sparse vegetation, and control (bare land), with 3 replications for each category. Pioneer plants and endomycorrhiza were identified. Plant biomass, soil pH, total-C,-N, and exchangeable-K, -Ca, -Mg, -Fe were analyzed. The abundance of pioneer plants and their interaction with mycorrhiza was strongly correlated with depth of eruption material, quantity of sandy texture, soil pH, total-C and total-N, exchangeable-K, exchangeable-Ca, exchangeable-Mg, and exchangeable-Fe. Among the 12 identified pioneer plants, only Acacia villosa, Fiurena ciliaris, and Bidens pilosa were recommended as plant-remediator to improve soil chemical, physical and biological properties. Among the 3 genera of endomycorrhiza (Acaulospora, Gigaspora, Glomus), only Acaulospora was recommended to be a biological agent to rehabilitate sandy soil area. This research indicated that adaptive pioneer plants and endomycorrhiza were likely to be suitable for biological agents to stimulate recovery of degraded land through improvement of physical, chemical, and biological properties, that will stimulate plant growth and biodiversity
Institutional Role in Gunung Walat Educational Forest Policy: Discourse and Historical Approaches
Get PDFInstitutional science with various approaches have been used in analysing forest policy at international level and in Indonesia. This research used institutional science with discourse and historical approach for the policy of Forest Territory with Special Purpose (Kawasan Hutan dengan Tujuan Khusus, KHDTK). This research study the KHDTK case of Gunung Walat Educational Forest (Hutan Pendidikan Gunung Walat, HPGW). The goal of this research is to understand discourse/narration of policy and describe the policy space for HPGW and KHDTK. Institutional analysis in this research used discourse and historical approach. Discourse analysis used IDS model supported with Wittmer-Birner model and Eden-Ackermann diagram. On the other hand, historical approach used the historical relationship. The research outcome showed that the process of creating HPGW policy is not linear, but being affected by policy discourse/narration in the process of creating HPGW policy. Faculty of Forestry IPB has been successfully managing HPGW because of the success to build policy discourse/narration which is supported by the knowledge of HPGW managers, cooperation network, and interest and power. Meanwhile, external party perceived and believed the importance of HPGW management for forestry education. The success key of HPGW policy is in structuring the institution that control the behavior of HPGW managers, so the managers obtained trust from third parties to create interest alliances which can boost HPGW management performance. HPGW policy can be used to fulfill KHDTK policy space according to Article 8, Forestry Law Number 41 Year 1999
Soil Compaction by Valmet Forwarder Operation at Soil Surface with and without Slash
Get PDFSoil 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
Modeling of Forest and Land Fires Risk Level and Zone Using GIS in Kapuas Tengah Sub Basin, West Kalimantan Province
No full textIn 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 ma
Distribution of Pine Woolly Adelgids Infestation on Pinus merkusii Plantation in Java
Get PDFPine woolly adelgid is a recently found exotic pest attacking seedling up to grown plants of Pinus merkusii plantations forest. Since its discovery, there were not much information about it. The objectives of this research were to study pine woolly adelgids distribution, symptoms and indicators, and its scale of infestations on Pinus merkusii plantation in Java, to determine the presence of any specific P. merkusii sites invaded by pine woolly adelgids, considering the pests were native to boreal and temperate areas. Hypothesis was pine woolly adelgids infestation on P. merkusii in Java is consistent with their native distribution. There were 9 Forest Management Unit (KPH) with infested P. merkusii plantations which were located at altitude between 900 to 1,700 m asl. with temperature ranging 16-22 °C and air humidity 80-90%. This indicated that Pine Woolly Adelgids required low temperature to survive, which was consistent with their original distribution. Host preference with regard to scale of infestation was closely related to temperature, altitude, and number of trees per hectare. The scale of infestation varied among regions, from light to heavy infested/death of trees