Jurnal Manajemen Hutan Tropika
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The Establishment of Forest Plantation
Get PDFThe establishment of forest plantation of Eucalyptus deglupta in the humid tropic, for pulp and paper industry has so far been hindered seriously by insect stem borer larvae (Zeuzera coffeae ), damaging young and mature stands, and cause important financial lost. Coupling with integral forest pest management and good silvicultural treatements, a strategy for resistance breeding program to stem borer larvea need to be developped for that promising species, in order to establish sound industrial plantation and to accelerate genetic gain achievement per unit time. This study deal with the assement of E. deglupta woods properties, (including anatomical, physicals properties, and chemical substances), that may supposedly be directly implied in resistency mechanisms of Leda againts insect stem borer attack. The preliminary results indicated that sound, tolerant and resistant indvidual trees tend to have higher wood density, than unhealty one. Sound, resistant and tolerant trees tend also to have greater and statistically different in fiber length, fiber diameter, cells walls thickness and lumen diameter than that of unhealty one, especially from that one that have been fortly attacked by stem borer. The preliminary results also indicated that resistance trees tend to exhibit more alcaloid, terpenoid and flavonoid content than the unhealty one. However, the results need to be confirmed by addition of more wood samples to be analyzed for each type of degree of insect injury
Studi Kemampuan Tumbuh Anakan Mangrove Jenis Rhizophora mucronata, Bruguiera gimnorrhiza, dan Avicennia Marina Pada Berbagai Tingkat Salinitas
Get PDFSalinity is one of environmental factors having an important role in controlling mangrove growth. Our research results show that the degree of salinity has significant effect on the height seedling growth of Rhizophora mucronata, Bruguiera gimnorrhiza and Avicennia marina. Its salinity has also significant effect on the leaf growth of two later species. In general, the highest growth of both seedling’s height and the number of leaf for all species occur on the salinity ranged from 0.0 to 7.5 ppt
Analisa Keseimbangan Pasar dan Reposisi Strategi Pemasaran Kayu Lapis
Get PDFThe economic crisis’ turbulence blows down almost all of Indonesian export commodity, included plywood. Dissolution of JMB-Apkindo (Joint Marketing Body-Association of Indonesian wood based panel) as an implementation of Letter of Intent between Indonesian Government and International Monetary Fund caused reposition of the Indonesian plywood marketing. Impacts of the dissolution of JMB are weakening of the bargaining position of Indonesian plywood market and pushing down the international price of Indonesian plywood. The large scale of illegal logging that follows reformation’s euphoria is another problem which influences supply-demand of timber products. A right strategy in the forestry sector policy especially in plywood marketing is needed to overcome the above problems
Respon Pertumbuhan Akar Tanaman Sengon (Paraserianthes falcataria) terhadap Kepadatan dan Kandungan Air Tanah Podsolik Merah Kuning
Get PDFThe purpose of this experiment was to investigate the influence of soil compaction and water content on root development of 6 month old sengon seedling. The experiment was arranged 3 x 3 factorial experiment within a complete randomized design and 3 replications. The factor number one was soil compaction and factor number two was soil water content. The soil compaction factor consists of 3 levels, which are 1,5 g/cm3 (A1), 1,2 g/cm3 (A2), and 0,9 g/cm3 (A3) respectively, while the soil water content also consists of 3 levels, which are 60,41 % (B1), 49,64% (B2), and 42,86 % (B3) for each level. The parameters were counted which are root number, diameter, root length, biomass, surface area, and root length density. The result was that soil compaction treatment has a significant influence to root number, root length, biomass, surface area, and root length density. On the other hand the soil water content treatment on pF 2,54 until 3,5 and interaction soil compaction and water content have no influence to root number, diameter, root length, biomass, surface area, and root length density. Root number, diameter, length, biomass, surface area and root length density were increased accordingly to the age of the seedling, but the increasing of soil compaction has decreased to the number, length, root length, biomass, surface area and root length density. The secondary root was found more larger than the primary and the tertiary root in term of the root length, surface area and root length density
Deteksi Kondisi Hutan Paska Kebakaran Melalui Citra Multisensor MOS-MESSR dan Landsat TM: Studi Kasus di Areal PT. MHP Sumatera Selatan
Get PDFThis paper presents how the multisensor MOS-MESSR and Landsat Thematic Mapper (TM) should be manipulated as tools for detecting land cover changes. Radiometric correction using image regression was recognized as useful approach to adjust pixel brightness value of MOS-MESSR. In this study, the standardized MPC showed comparable accuracy, similar to DMC method. Using this technique forest changes due to fire as well as land clearing were well recognized. Some recommendations and suggestions for improving classification accuracy of change detection using multisensor MOS-MESSR and Landsat TM were drawn up from this study
Kondisi dan Masalah Air di Pulau Jawa
Get PDFWater is very vital for the life of human beings, animals and plants. At present, the availability of water which have proper quality, has become a serious problem. This phenomenon can be seen from the data issue by DIALOG Journal which described that 1.2 billion people in the world has no acces anymore to clean water. The important impacts of contamination on clean water are among other things : every hour around 400 children suffer from fever, dysentry and cholera. Among those who suffer from such ailments, 37% are helpless and meet their death. In several places in Java island, problems of lack of clean water have been encountered since several years ago. This article discusses the problem of water supply, especially in Java island
Practical Technique for Detecting Mangrove Vegetation Using Digital Mos Messr and Landsat-5 TM Images: A Case Study in Karawang Cape, West Java
Get PDFStudi ini menerangkan bagaimana algoritme-algoritme indeks separabilitas dan akurasi klasifikasi seyogyanya diterapkan secara benar untuk mendeteksi obyek-obyek yang dikehendaki secara optimal. Studi ini menemukan bahwa akurasi Kappa dan kriteria Separabilitas (Transformed Divergence) harus digunakan secara simultan. Evaluasi dengan hanya menggunakan akurasi Kappa saja atau separabilitas saja akan memberikan hasil yang keliru. Algoritme-algoritme yang diterapkan diujicobakan pada data dijital MOS MESSR (Marine Observation Satellite Multispectral Self-Scanning Radiometer) dan Landsat TM (Thematic Mapper) untuk mendeteksi distribusi vegetasi mangrove. Studi ini memperlihatkan bahwa algoritme-algoritme yang diujicobakan pada MESSR dan TM berhasil mendeteksi distribusi mangrove secara baik, dengan akurasi pengguna (user accuracy) dan akurasi pembuat (producer’s accuracy) yang cukup tinggi berkisar antara 55% dan 100%
Study on the Use of Small Format Non-Metric Aerial Photos For Establishing Aerial Teak Stand Volume Table (A case study in Randublatung Forest Management Unit, PT.Perhutani Unit I, Central Java)
Get PDFPenelitian ini mengkaji tentang pemanfaatan foto udara non-metrik format kecil (SFNAP) guna menyusun tabel volume udara tegakan jati (aerial stand volume table of teak wood) di KPH Randublatung, Perum Perhutani Unit I, Jawa Tengah. Sebagai perbandingan, pengkajian terhadap penggunaan potret udara metrik konvensional (CAP) juga dilakukan. Hasil penelitian menunjukkan bahwa secara teknis SFNAP layak digunakan untuk mengestimasi potensi tegakan sebagaimana ditunjukkan oleh hasil tes statistik. Model terbaik untuk estimasi volume tegakan jati menggunakan SFNAP di lokasi penelitian adalah V = 52,4 – 0,469 C (r2 = 76,2%), sedangkan model terbaik menggunakan CAP adalah V = 32,4 – 0,246 C (r2 = 69,1%)
Kajian Teknis Pemanfaatan Potret Udara Non-Metrik Format Kecil Pada Bidang Kehutanan
Get PDFThis paper describes the feasibility of small format non-metric aerial photographs (SFNAP) for forestry purposes. The analysis covers evaluation of the stereoscopic vision quality and the use of SFNAP for estimating stand variables such as tree height, crown diameter, crown density and number of trees. The study found that the SFNAPs were feasible to be applied for forestry purposes. Although the marginal information such as fiducial mark and nivo that usually used for determining the principal point and tilt are not available in the SFNAP, the study found that the stereoscopic vision could be made quite easy, and the stand variables could be well measured. Also, even though the SFNAPs were printed using enlargement process (not contact printing), the produced photographs were quite sharp and have good contrast
Kontribusi Hutan Rakyat terhadap Pendapatan Rumah Tangga di Sub DAS Cimanuk Hulu
Get PDFThis article provides the contribution of private forest to household income. Private forest has the ecological and economic functions. One of the ecological functions is hydro-orological function, while the economic function is as one of the income source for the owner. This article used the secondary data from the survey of Upper Cimanuk Watershed Management at 1996. The results of the research indicate that the contributions of private forest to the total income of household are different: for upper zone (31,5%), middle zone (5,6%) and lower zone (10,2%). Those differences are highly correlated with the extent degree of land fertility