Jurnal Manajemen Hutan Tropika
Not a member yet
600 research outputs found
Sort by
Penerapan Reduced Impact Logging Menggunakan Monocable Winch
Get PDFForest harvesting still encounters many problems especially concerning impact to the residual stand and environmental damage. Implementing the reduced impact monocable winch and planning of good skid trails should have a positive impact on work efficiency as well as, reducing damage to the residual stand and soil during felling and skidding activities. Reduced impact logging (RIL) with a monocable winch (Pancang Tarik) system has been tried in several IUPHHKs and it can be concluded that RIL monocable winch system could be applied practically and reduce impact on residual stand and soil damage. Using this technology has many advantages, among others: cost efficiency, locally made, environmental friendly, and high local community participation. Application of the monocable winch system in reduced impact logging is an effort to reduce economical and environment damages when compared to conventional system of ground based skidding with bulldozer system. The aim of this research is to verify the efficiency (operational cost), effectiveness (productivity) and time consumption of monocable winch system. The results indicate that the implementation monocable winch system, has reduced the soil damage as much as 8% ha-1. The skidding cost with monocable system is Rp95.000 m-3. This figure is significantly cheaper if compare with ground base skidding with bulldozer system in which the skidding cost around Rp165.000 m-3
Organic Acid Characteristics and Tolerance of Sengon (Paraserianthes falcataria L Nielsen) to Lead
Get PDFThis study aimed to find out the lead tolerance of sengon (Paraserianthes falcataria) seedling based on growth performance, tolerance index, and ecretion and accumulation of organic acids content. Seedlings were exposed to lead (Pb) with the concentration of 0, 0.5, 1, 1.5, 5, and 10 mM in liquid nutrient culture for 4 days in order to investigate secretion and accumulation of oxalic, malic, and citric content, and for 15 days to examine growth performance and olerance index. The result showed that tolerance index and growth performance of engon seedling were insignificant (p > 0.05) to the rising of Pb concentration up to 1.5 mM with tolerance index at least 95%, and even caused an increase of fresh weight. However, the tolerance index and growth of sengon decreased significantly due to Pb exposure of 5 and 10 mM. Among the three organic acids, citrate was most dominant as compared to malate and oxalate. Secretion of citrate increased significantly (p < 0.05) with the rising concentration of Pb 0.5, 1 and 1.5 mM, reaching to 0.464, 0.540, and 0.587 µg mℓ-1, respectively, or rising according linear line (r = 0.9, p < 0.5). Citrate accumulation showed inconsistent pattern with the rising Pb exposure. The result suggested that sengon seedling have a slightly tolerance to lead by secretion of organic acid especially citric acid
Rarity Status and Habitat of Shorea laevis and Shorea leprosula in Muara Teweh, Central Kalimantan
Get PDFForest exploitation and conversion to other landuse may cause lost of biodiversity, including most important dipterocarp trees species, i.e. Shorea leprosula and Shorea laevis. The objective of this study was to determine the rarity status of the two important shorea species, i.e. S. laevis and S. leprosula, based on IUCN criteria, their habitat characteristics, and their association with other species, as one of the basis for determining their conservation strategy as a part of forest management. This study was conducted in three types of ecosystem (virgin forest, secondary forest, and fragmented forest) in Muara Teweh, Central Kalimantan. Methodology used in this research includes vegetation and tree diversity analysis. Study results showed that both S. laevis and S. leprosula were included within category of “low risk” in the 3 types of ecosystem in the forest area being studied. Habitat characteristics which determined the absence of S. laevis in the virgin forest habitat was the soil permeability which was too low, whereas other soil chemical and physical properties in the three types of ecosystems were relatively similar. Presence of S. laevis were positively associated with species of S. uliginosa, Dialium platysepalum, Dipterocarpus ibmalatus, Palaquium rostatum, Vatica rasak, Adinandra sp., and Memecyclon steenis. On the other hand, S. leprosula were positively correlated with S. kunstleri, Castanopsis sp., Shorea sp., Quercus bennettii, Castanopsis argentea, and D. hasseltii
Kajian Pengembangan Produk Wisata Alam Berbasis Ekologi di Wilayah Wana Wisata Curug Cilember (WWCC), Kabupaten Bogor
No full textRecreation development is usually oriented toward on the mass tourism to maximise a number of tourists and rarely put the environmental aspect into consideration. This created an effect on the sustainability of ecology. This study’s emphasis is on figuring out an alternative of outdoor recreation product which based on the ecology aspect to support the development of outdoor recreation in the Wana Wisata Curug Cilember (WWCC). This study put the characteristic of tourist and local people into consideration which are describe the product of ecology recreation in order to achieve an ideal product that has not been reached previously and still need more serious effort. Analysis descriptive with qualitative and quantitative approach is used in this study. SWOT (Strengths, Weaknesses, Opportunities, Threats) and descriptive statistic are considered for alternative outdoor recreation product while the AHP (Analysis Hierarchy Process) has been used to achieve a priority product for implementation. The findings suggested a diversification strategy or S-T (Strengths – Threats) was chosen to develop the products of recreation in WWCC. The priority of these products based on the AHP value are as follows: a) Water falls (0.2700), b) Natural scenery (0.1623), c) Camping (0.1405), d) Hiking (0.1073), e) Theraphy of water fall energy (0.0885), f) Plants viewing (0.0665), g) Wildlife viewing (0.0525) and h) Outbound (0.0380)
Format Sistem Bagi Hasil dalam Pengelolaan Hutan Bersama Masyarakat dengan Sistem Agroforestri
Get PDFThe purposes of this research are to know the feasibility of the sharing form, to find the sharing form which can improve of forest quality and local society welfare, and to identify factors which influence the sharing form implemented by PT.Perhutani and local society. This research was carried out in Cileuya village, Cimahi subdirect, Kuningan regency. The sharing form implemented by PT.Perhutani and local society who lives surrounding the forest was 20percent : 80percent. The mechanism of the sharing was for the primary plants that is super teak. PT. Perhutani get 80percent, while the society get 20percent For bananas, petai and mango tree, PT. Perhutani get 20percent while the society get 80percent. To know the feasibility the sharing form, the study then used NPV, BCR and lRR project indicators. Among all of the sharing form examined, the study found that the sharing form of 25percent : 75percent was the most feasible one to be used than others
Determining the stem volume of a tree
Get PDFDetermining the stem volume of a tree has long been a problem for foresters, whereas, the need for an accurate estimate of wood volume is becoming more important. six volume equations were used and compared, for both constructing and validating models using data collected from Gmelina arborea Roxb. in the area P.T. Wanaksita Nusantara, Province of Jambi, Indonesia. The best equation obtained from model construction (fitting) step for a data may not necessarily be the best performance (shown from bias, precision and accuracy) for another data set though collected from the same population. For testing the occuracy of model, model validation is an important step in model construction process in order to get the best tree volume equation
Integration of Spectral and Textural Features from Ikonos Image to Classify Vegetation Cover in Mountainous Area
Get PDFStudi ini mengevaluasi penggunaan fitur spektral dan tekstur secara terintegrasi yang didapat dari citra IKONOS untuk mengindentifikasi tipe-tipe tutupan lahan pertanian di daerahpegunungan. Studi meliputi pra pengolahan citra, pengembangan metode kuantisasi citra, penghitungan nilai tekstur, pembuatan dataset dan penilaian akurasi. Pra pengolahan citra berfokus pada registrasi citra dan normalisasi topografis. Dalam studi ini dikembangkan dua metodekuantisasi citra yaitu segmentasi citra dan filter rata-rata. Segmentasi citra mengklasifikasi citra kedalam beberapa segmentasi berdasarkan determinasi jumlah total piksel setiap kelas, sedangkan filter rata-rata mengelompokkan citra berdasarkan rata-rata nilai angka dijital dalam ukuranwindow tertentu. Empat ukuran tekstur yaitu inverse difference moment, contrast, entropy dan energy dihitung dengan grey level co-occurrence matrix (GLCM). Hasil studi menunjukkankombinasi aspek spektral dan tekstur meningkatkan akurasi klasifikasi secara signifikan dibandingkan klasifikasi hanya menggunakan fitur spektral saja. Segmentasi citra dan filter rata-rata dapat memberikan bentuk-bentuk spasial tipe tutupan lahan pertanian yang lebih efektif dibanding menggunakan citra dengan derajat keabuan 256. Ketelitian keseluruhan meningkat 11,33% ketika menggunakan integrasi spektral dan fitur tekstur inverse difference moment (5x5) danenergy (9x9)
Penerapan Analisis Diskriminan dalam Pembedaan Kelas Umur Tegakan Pinus
Get PDFThis study describes the use of discriminant anylisis for pine (Pinus spp.) stand class age distinction. Aim of this study were (1) to arrange stand age class based on variable of aerial photograph by non hierarchy cluster analysis, and (2) to find out aerial photograph variable contribute to stand age class distinction by discriminant analysis. Data used in study was taken from a research conducted by Adi (1998). Pinus stand was located in KPH Bandung Utara, West Java. The variable of aerial photograph that used in this analysis were tone, shape, texture, topography, pattern, crown, diameter and height. The result showed that validation analysis of discriminant function was significant. Therefore, this function was applicable for grouping new object to stand age class based on discriminant score
Antifungal Activities of The Extracts From Some Tropical and Temperate Woods
Get PDFEmpat flavonoids (Sciadopitysin) (1), Ginkgetin (2), Ishorhamnetin (3), dan Quercetin (4), dua Texanes (Taxinine) (5) dan Taxol (6), dan Phenylisoserine methyl ester (7) dapat diisolasi dari Taxus cuspadata var. nana. Senyawa (7) juga dapat diisolasi dari Taxus chinensis. Senyawa (7) dapat diisolasi untuk pertama kalinya masing-masing dari T. cuspidata var. nana dan T. chinensis.Aktivitas antifungus senyawa-senyawa yang terisolasi tersebut dan tujuh turunan taxinine terhadap tujuh fungi patogenik tanaman (Cochliobolus miyabeanus, Alternaria kikuchiana, Giberella fujikuroi, Cladosporium cucumenium, Fusarium oxysporum, Colletotrichum fragariae dan Corynespora cassiicola) telah diukur. Taxinine dan tujuh turunan taxinine menunjukkan adanya aktivitas antifungus terhadap lima jenis fungi. Diantara tiga jenis kayu tropis (Amboyna,Kempas,Angsana),kayu Amboyna menunjukkan aktivitas antifungus terhadap empat fungi dari basidiomycetes (Le,Pp,G3,dan PLI). Selanjutnya, ekstrak methanolic dan fraksi larutnya nhexane dan ethyl ether dari kayu Amboyna menunjukkan aktivitas antifungus terhadap fungus Pp.Kata kunci: Antifungi, flavonoid, Texanes, phenylisoserine methyl ester, kayu tropis dan temperate, fungi patogenik tanaman, basidiomycetes
Rancang Bangun Model Dampak Perubahan Penggunaan Lahan dalam Pembangunan HTI Pulp (Modeling Land Use Change Impacts around Developed HTI Pulp Concession Area)
Get PDFThis research aim to establish a land use change model purposed to figure a spatial ecological equilibrium out from the land used activities. The analyzing of these land use change impacts were adopted from modeling methods, based from system thinking approach. Although the analytical constructions dominated by social sciences, all methodologies were drawn from more than one field of discipline to analyze the nature-society-economy relationships. These interdisciplinary orientation combining concepts has some advantages in recognizing most complex variables in the real world than another functional approaches. The model has verified to validate in villages around the HTI concession area of Jambi Province which is managed by PT Wirakarya Sakti (WKS), and resulted some behavior patterns of land use changed that showed in descriptions as a whole. At last, sensitivity analysis of this model - like a game - has developed the “what if” input variables to predict situation of the future, and has resulted some options of scenario as decision support to the policy system framework.Keywords: Ecologycal equilibrium, HTI pulp concession area, land use change, modeling, system thinking approach, decision support system, Jambi