Jurnal Manajemen Hutan Tropika
Not a member yet
600 research outputs found
Sort by
Initial Infection of Falcataria moluccana Leaves and Acacia mangium Phyllodes by Uromycladium tepperianum Fungi in a Laboratory Trial
No full textSengon is a fast growing species that is cultivated widely in Indonesia. Lately, sengon is severely attacked by fungus Uromycladium tepperianum that causing gall rust disease. It is also known to attack various types of acacia. This study aims to determine the fungal infection process U. Tepperianum on sengon leaves and the possibility of infection on Acacia mangium in the laboratory trial. Leave samples and fungal pathogen teliospores obtained from Cangkringan, Sleman, Yogyakarta. Several approach procedures conducted to achieve these objectives were: (1) identification of diseased trees, (2) collecting samples of diseased leaves, branches, twigs, and stems, and (3) artificial inoculation and investigating the infection process of U. tepperianum teliospores in the laboratory. The results showed that the process of infection in sengon started by teliospores germination and germ tube formation. Successive germ tube forming penetration pegs. In the plant tissue, the penetration peg formed hypha and further developed into intracellular and intercellular hyphae. The artificial inoculation on A. mangium leaf surface showed few spores can germinate. However, none of them managed to penetrate.
Implications of the Private Property Right to the Community Forest Businesses Formalization through the Certification Policy
Get PDFThis study aimed to analyze the implication of formalization of community forest business efforts through mandatory timber legality certification policy. Field survey was conducted in March–April 2012 in 3 districts in Central of Java namely Blora, Wonogiri, and Wonosobo District. The results showed that community forest is mainly planting in their private owned land. It brings 2 consequences. Firstly, their willingness to manage their forest sustainably was emerged without any enforcement from external parties. Secondly, there were autonomous in decision making in their way to manage their forest such as they only planted tree species that easy to sell and valuable, they only cut their trees when they need huge money for children schooling, marriage, illness, and housing. The autonomous decision making gives also the owners (farmers) other alternatives to utilize their land otherwise planting the trees. It is mean, if the policy is decreasing the potential benefits from growing the trees, they can also convert their community forest into other business in which profitable and easy to sell their products. From those facts, it seems the formalization of community forest business through mandatory certification is not a proper policy to enhance the community forest
Total Economic Value in Investment Analysis
Get PDFForest ecosystems are often defeated in decisions about investment and economic development. There is a very wide gap between policy makers and development investment on the one hand and environmentalists on the other hand, who see the forest ecosystem from the perspective of ecology and environment. The first party considers that forest ecosystems have a low value, while the second party often shows very fantastic figures about the economic value of forests. From the second party\u27s point of view, the first party could be ignorant or having a short-term interest; while from the first party\u27s point of view, the second party loves to produce the figures that are too good to be true. As a result, the total economic value of ecosystems is not only ignored as a consideration in investment decisions, but the total economic value of ecosystems has been seen as a boring scientific joke. Why did the gap occur and how to close the gap will be discussed in this paper. Economic valuation of ecosystem needs to be done more realistically so that the results are more plausible before policy makers. On the contrary, policy makers need to be aware that once a species vanished it never goes back.Keywords: ecosystem, goods and services, value, trade-off, double counting DOI: 10.7226/jtfm.19.3.20
Low Impact Felling Distance and Allowable Number of Felled Trees in TPTI System
Get PDFIndonesian Selective Cutting and Planting System (TPTI) is a silvicultural system of production natural forests management conducted in Indonesia. TPTI implementation has resulted in damage to the residual stands and threatened the existence of production natural forests in Indonesia. This study assessed the damage level of the residual stands of commercial species due to low cutting intensity (0.77 trees ha-1), calculated low damages cutting distance, and determined the number of trees ha-1 which could be harvested sustainably. Dynamic sample plots with a circular shape with a radius of 2 times the height of felled trees were used in this study, and the number of sample plots was 29 plots with an average area of 1.3 ha. In the sample plots, the tree species, total height, diameter at breast height (dbh), and number of commercial trees ≥ 10 cm dbh were measured before and after cutting. The results showed that the damage level of residual stands caused by the low cutting intensity was 2.1%, where the damages included broken stems, splitted stems, and injured stems, leaning trees, fallen trees, broken crowns and broken buttresses. The low cutting intensity had damaged 7 commercial tree species with the diameter ≥ 10 cm. The study recommends sustainable cutting on TPTI with a distance of > 1.5 times the height of felled trees and the number of trees ha-1 that may be sustainably felled is no more than 5 trees ha-1.
Conservation Strategy of Rafflesia zollingeriana Koord in Meru Betiri National Park, East Java
Get PDFRafflesia zollingeriana Koorders is a protected, rare, and endemic plants to Meru Betiri National Park. However, its population was declined. So, the study was focused on the analysis of the strengths, weaknesses, opportunities, and threats of conservation of R. zollingeriana to recommend some conservation\u27s strategy and programs. This study was conducted at Meru Betiri National Park and its surrounding 5 villages. Data were collected by interviews, survey, observations, and literature studies. Qualitative data was analyzed by reduction, presentation and drawing conclusions simultaneously, while the quantitative data was analyzed descriptively. Matrix for SWOT analysis was processed by SPSS 16. The result showed that there were 4 elements that identified as strength, 5 elements that identified as weakness, 5 elements that identified as opportunity and 4 elements that identified as threat. The internal factor\u27s value was higher than the external factor. The result of the SWOT analysis indicated that it needs aggresive strategy through collaboration among stakeholders to optimize both strength and opportunites. While the recommended program are: socialization the importance of R. zollingeriana conservation and developing a collaborative R. zollingeriana ecotourism
Tropical Forest Landscape Fragmentation in Batang Toru Watershed, North Sumatra
Get PDFTimber-based forest management is now shifting to as broader scope including ecosystem-based management. Timber-oriented forest management frequently affects the fragmentation of forest landscape. This paper defines the degree of forest landscape fragmentation in Batang Toru watershed, North Sumatra through indentification of correlation between forest landscape fragmentation and driving factors including biophysical and anthropogenic factors. Identification structure, pattern, and fragmentation of forest landscape were performed using Landsat imageries acquired in 1989, 2001, and 2013. Forest and land cover classes were analyzed using FRAGSTAT 3.3 to generate landscape metrics. Fragmentation of forest landscape was identified using landscape metrics, i.e., area, patch density, number of patch, contiguity and proximity index. The clumpiness index of landscape metrics describes the pattern of forest landscape, while the patch size proportions expressed structure of forest landscape. This study found that forest landscapes located in downstream of the watershed show more fragmented than area in the upper stream, while the sub-watershed of Batang Toru Hilir is more clumped than the others. This study concludes that (1) the forest landscape fragmentation tend to increase since 1989 to 2013; and (2) the degree of forest landscape fragmentation has close correlation with the distance to main road and river.
Benefits of Sasi for Conservation of Marine Resources in Raja Ampat, Papua
Get PDFResidents of Raja Ampat, Papua, have been practicing sasi for generations to manage local marine resources. Recognizing its importance for marine resource conservation, efforts have been made to integrate sasi into current conservation management approach. This study was carried out with 3 objectives: (1) to define and elaborate sasi; (2) to examine the benefits of sasi for conservation of marine resources; and (3) to evaluate the change of sasi in the context of conservation. Multi-method approaches were employed to collect data from local communities in Dampier Strait District MPA in two separate sampling periods. Results indicated that sasi in Raja Ampat could generally be categorized into samson or kabus which basically reflect different aspects such as location, type of commodity, implementing ceremony, period of closure, the influence of monsoons, and communal ownership. The benefits identified included the increase in target fish production, the lowered level of exploitation, the improved recovery of fish stocks, and the increase in the local people\u27s income. From the modern conservation management point of view, it was obvious that sasi could help protect and sustain marine biological resources. Therefore, it is essential to incorporate sasi into modern conservation management practices and vice versa
Effects of Forest Cover Change on Flood Characteristics in the Upper Citarum Watershed
Get PDFInformation on the effect of forest cover changes on streamflow (river discharge) in large-scale catchment is important to be studied. The rate of forest cover change in the Upper Citarum Watershed as a large-scale catchment is high enough to drive streamflow change, such as increase of discharge level, or flood volume. Within the research area, flood would occur when the volume of streamflow exceeded the canal capacity and inundated areas that were normally dry. Therefore, this research focused on identifying the effects of forest cover change on flood events and its distribution. The research consisted of 2 main stages; firstly, building geometric data of river and performing frequency analysis of historical and scenario discharges using an approach of probability distribution; and, secondly, flood inundation mapping using HEC-RAS model. The results showed that forest reduction have affected water yield in the downstream of Upper Citarum Watershed. In each return period, this reduction have increased river discharge level and affected the spread of flooded areas. In 2-year return period, the extent of flood as an impact of forest reduction was estimated to decrease slowly. However, in the return period of more than 2 years, the spread of flooded areas increased sharply. These proved that forest cover reduction would always increase the discharge value, but it did not always expand the inundated area.
Evaluation of Annual Allowable Cut (AAC) Determination of Teak Forest Plantations in Perum Perhutani, Indonesia
Get PDFThe degradation of teak forest plantations in Java that are managed by Perum Perhutani (PP) continues to happen, and this is caused by some risk factors such as illegal logging, grazing, forest fire, and encroachment. However, these risk factors have not been considered by PP notably in annual allowable cut (AAC) determination of yield regulation. Therefore, the AAC value could be overestimated. The research was aimed at evaluating the method of AAC determination and proposing an alternative method that considers the risk factors. This research was conducted with a series of data analysis approach from the data on five planning periods. The research result showed that forest damage occurs in varied situations. On average, the rate of deforestation accounted for 0.8% per annum. The calculation of AAC by considering the rate of damage risk in normal condition approximately made up 70.8%. Thus, compared to another method without considering damage risk rate, overestimation constituted 29.2%. In brief, this had an impact on the decline of timber stock.
Adoption of Agro-forestry Patterns and Crop Systems Around Register 19 Forest Park, Lampung Province, Indonesia
Get PDFTo return the ecological function of Wan Abdul Rachman Forest Park, it must be involved the role of buffer zone communities living around the forest by optimizing the cultivated land with applying agro-forestry based on socio-economic conditions in the community, such as community preferences and adoption of agro-forestry patterns. Under these conditions it is necessary to hold a study concerning to the level of community preference to the type of plants and the level of adoption, as well as the NPV analysis of the 3 patterns of agro-forestry which are applied by the majority of community around the forest park. Results of the study revealed that there were 3 dominant plant types preferred by the community in the forest park, namely: coffee (30.8%), cacao (35.8%), and rubber (17.4%). Based on these crops, there were 3 agro-forestry patterns practiced by the majority of community in their cultivated land. They were: (1) coffee-cacao-wooden plants, and fruits (47%), (2) rubber-coffee-wooden plants, and fruit (35%), and (3) rubber-cacao-wooden plants, and fruit (18%). The highest personal and social NPVs obtained in the agro-forestry pattern of rubber-coffee-wooded plants, and fruits were IDR4.589.627.36 and IDR6.454.806.01, respectively. To ensure the sustainability of the program, the development of communities living around the forest together with a program of community empowerment in the block of utilization and social forestry in the forest park are recommended to continue, based on the Regional Regulation (PerDa) Number. 3/2012.