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Preliminary Study on Genetic Variation in Vulnerable Species of Johannesteijsmannia altifrons in Sikundur Forest, North Sumatra Mohammad Basyuni; Suci Rahayu Rahayu; Jayusman Jayusman
FORESTA Vol 1, No 1 (2012): MARET
Publisher : FORESTA

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Johannesteijmannia altifrons is vulnerable species according to Red Data Book from IUCN. This species may have two sub populations namely sang minyak and sang gajah. For conservation strategy, study on the genetic variation of this species was needed. The study aimed to examine the genetic variation of J. altifrons in Sikundur Forest, Gunung Leuser National Park, North Sumatera, using Isozymes marker. From three enzyme systems used (ACP, MDH, and PGD), two polymorphic loci were detected. Highest estimate of genetic variation parameters i.e. observed and expected heterozygosity were found in sang gajah, whereas sang minyak showed lower genetic diversity. This preliminary result suggested that this species had low average of polymorphic (40 %). Based on polymorphic level and expected heterozygosity, both sub populations genetically closed to each other. The differences of both sub populations lay on the wide leaf. Understanding of genetic variation suggested the importance of conservation effort of this species to increase number of populations.Key words: vulnerable species, genetic variation, Johannesteijsmannia altifrons., preliminary results

Study on the Potential of Inundation area by tsunami in Ciamis Coastal of West Java Anita Zaitunah; Cecep Kusmana; I Nengah Surati Jaya; Oteng Haridjaja
FORESTA Vol 1, No 1 (2012): MARET
Publisher : FORESTA

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Indonesia has experienced many earthquakes and tsunamis. Tsunamis had caused heavy destruction and deaths. The aim of the study is to find out spatially the potential of inundation area by tsunami. GIS analysis was conducted using Arcview software to obtain an elevation map and the potential of inundation area caused by tsunami. The run up of 7.5 m flooded 4% from whole study area. When the run up was 7,5 m, some areas were flooded reaching 200 m from the coast and there were also some points going further to 1 km. The information on the distance and extent of inundation from by tsunami can become an input on potential areas flooded by water and having destruction.Key words : tsunami, inundation, coastal area, West Java

Spatial Model of Land and Forest Fire Risk Index, Case Study in Central Kalimantan Province Samsuri Samsuri; I Nengah Surati Jaya; Lailan Syaufina
FORESTA Vol 1, No 1 (2012): MARET
Publisher : FORESTA

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This article describes spatial models of land and forest fire risk in Central Kalimantan. The models were established base on human factor and biophysical factor approaches. The main objective of this research is to map out forest fire risk index in Central Kalimantan as well as to identify the major factor that significantly affect the forest fire risk itself. The study use CMA method to develop spatial model of land and forest fire risk. The mathematical model obtained from this study is: y = -0,00004x2 + 0,021x – 0,356 having R2 about 54 %. The significant factors that affect the forest fire risk are land allocation, land cover, land system and soil type. Model validation shows that the model can predict the risk fire index providing 66,76 % of accuracy.Key words: Central Kalimantan, forest fire risk, CMA, spatial model

Effect of Soaking Treatment to Oil Palm Empty Fruit Bunches Wettability and Its Comparison with Several Woods Wettablility Tito Sucipto; Surdiding Ruhendi
FORESTA Vol 1, No 1 (2012): MARET
Publisher : FORESTA

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The wettability in term of corrected water absorption height (CWAH) of treated oil palm empty fruit bunches (TKS) particles and compare with some woods wettablility was investigated. The treatments were soaking TKS in cold water, hot water and ethanol–benzene. The objective of the research was to know the effect of soaking treatment on the wettability as indicator of gluability of the TKS particles adhesion strength and its comparison with several woods wettablility. The research results show that the CWAH of the TKS which were soaked in cold water, hot water and ethanol–benzene were 72 mm, 202 mm and 214 mm, respectively. Meanwhile the CWAH of untreated TKS was only 46 mm, were lower than those the treated ones. The analysis of variance shows that the soaking treatment in ethanol–benzene and hot water significantly and positively affect wettability. Generally, CWAH of the TKS was lower than other woods, which effected by density, porousity and extractive difference.Keywords: oil palm empty fruit bunches, soaking treatment, wettability

Propagation Technique of Pasak Bumi (Eurycoma longifolia Jack) Via Shoot Cutting Arida Susilowati; Supriyanto Supriyanto; Iskandar Z. Siregar; Atok Subiakto
FORESTA Vol 1, No 1 (2012): MARET
Publisher : FORESTA

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Pasak bumi (Eurycoma longifolia Jack) is a treelet growing wildly in the forests of Southeast Asia and widely used throughout the region because of its medicinal properties. Uncontrolled harvesting of wild-grown trees has led to rapid decrease of natural populations. The objective of this research was to get information about propagation technique of pasak bumi by shoot cutting and its adventitous root formation. Cutting materials were originated from 7 month aged seedling propagated by seed. Media used were combination of cocodust : ricehusk (1:1 v/v), cocodust : ricehusk (1:1v/v) and cocodust : ricehusk (2:1 v/v). Research showed that medium significantly improved secondary root length, while rooting percentage, primary root length and the number of root significantly was affected by Rootone F treatment. The microtechnique result showed that roots were first developed from the mesristematic cambium cells.Keywords: Eurycoma longifolia Jack, propagation technique, shoot cutting

Analysis of Adhesion Quality of Mangium Laminated Wood with Polystirene Resin Tito Sucipto; Surdiding Ruhendi
FORESTA Vol 1, No 1 (2012): MARET
Publisher : FORESTA

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Adhesion quality effeccted by adhesive and adheren quality, adhesion process, and product purpose condition. Materials in this research used mangium wood (Acacia mangium) and polystirene resin. The objective of the research was to know the adhesion quality of laminated wood and effect of fiber orientation (axial/ A; radial/ R; tangensial/ T), glue spread (120; 170 g/cm2) and glue spread system (single spread/ SS; double spread/ DS) to adhesion quality of laminated wood. The research results show that the highest of glue line shear strength are 5.01 N/mm2 (R–SS–170) for dry test, and 4.68 N/mm2 (T–SS–170) for wet test. Meanwhile the lowest of glue line shear strength are 1.47 N/mm2 (A–SS–120) for dry test, and 1.47 N/mm2 (T–SS–120) for wet test. Only two wet test laminated wood (T–SS–170 and T–SS–120) fulfill Indonesian standard/ SNI 06–6049–1999 (glue line shear strength ≥3 N/mm2).Keywords: glue line shear strength, mangium, glued laminated wood, polystirene resin

Sifat Fisik Dan Kimia Ikatan Pembuluh Pada Batang Kelapa Sawit (Physical and Chemical Properties of Oil Palm Trunk Vascular Bundles) Arif Nuryawan; Affifuddin Dalimunthe; Rio Nare Saragih
FORESTA Vol 1, No 2 (2012): Indonesian Journal Of Forestry Volume 1 No. 2 (Juli 2012)
Publisher : FORESTA

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The research objective was to evaluate the physical and chemical properties of oil palm trunk vascular bundles. Physical properties consist of dimension, moisture content, specific gravity, and cell wall specific gravity. Chemical properties consist of extractives content, lignin content, and ash material. The evaluation methods of physical properties followed the standard which applied in wood. The evaluation methods of chemical properties followed the TAPPI standard. The information of physical and mechanical properties were shown in three section of the trunk, namely bottom, middle, and peak with average of three replication. The results of physical properties were as follow: the length of vascular bundles 10.55 cm and the diameter 0.67 mm, moisture content was 11.70%, specific gravity was 0.44, and cell wall specific gravity was 0.52. The chemical properties were solubility of cold water, hot water, NaOH 1%, lignin content, and ash material were 13.4%, 15.89%, 23.62%,22.20%, and 2,12%, respectively.Keywords : oil pump trunk vascular bundles, physical properties, chemical properties.

Pengaruh Aktivitas Antropogenik terhadap Keragaman Genetik Rhizophora mucronata Lamk. di Hutan Mangrove Secanggang, Sumatera Utara (Effect of Anthropogenic Activities on Genetic Variation of Rhizophora mucronata Lamk. in Secanggang Mangrove Forest, North Mohammad Basyuni; Hamzah Hamzah; Suci Rahayu; Ulfah J. Siregar
FORESTA Vol 1, No 2 (2012): Indonesian Journal Of Forestry Volume 1 No. 2 (Juli 2012)
Publisher : FORESTA

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Deforestation and fragmentation of mangrove forests in Indonesia are widespread that resulted in losing biodiversity including genetic variation. Rhizophora mucronata Lamk. is a common mangrove species in Secanggang, Langkat, North Sumatra and have been degrading due to anthropogenic disturbance. The aim of this study is to determine the genetic variation in natural population of R. mucronata in Secanggang, North Sumatra using isozyme markers. From five enzymes systems used namely aspartate aminotransferase (AAT), alcohol dehydrogenase (ADH), esterase (EST), malate dehydrogenase (MDH), and peroksidase (PER); eleven loci was found and five polymorphic loci were detected.The estimate value of genetic variation parameters i.e. observed and expected heterozygosity, average alel per loci, and average polymorphic (95% criteria) were 0.1386, 0.1724, 1.5455, and 45.45 % respectively.The low genetic variation of R. mucronata found in this study suggested that genetic variation may be influenced by anthropogenic activities such as illegal logging, conversion into shrimp pond and agricultural farm.Keywords: Anthropogenic, genetic variation, isozyme, mangrove, Rhizophora mucronata

Fungsi Hidrologi Kebun Karet (Hevea brasiliensis Muell. Arg) dalam Mereduksi Besaran Curah Hujan Bersih (Hydrological Function of Rubber Plantation (Hevea brasiliensis Muell. Arg) to Reducing the Magnitude of Net Rainfall) Bejo Slamet; Achmad Siddik Thoha; Riki Jaya Dinata
FORESTA Vol 1, No 2 (2012): Indonesian Journal Of Forestry Volume 1 No. 2 (Juli 2012)
Publisher : FORESTA

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Forest conversion resulted in loss of various forest functions, mainly the hydrological function changes. Mostly of the conversion of forests were to be oil palm and rubber plantations. Rubber plantation although an artificial ecosystem but had the similarity to forest condition. The purpose of this research was to examine the role of rubber plantation to reducing net rainfall that reached the plantation ground through the interception loss mechanism. Water volume balance was used to measure the interception loss.The results showed that the interception on the rubber plantation increased with the increasing of rubber age. Through fall tend to decreased with the increasing of rubber age were 60.56%, 53.62% and 43.79% of the total precipitation for 10 years, 15 years and 25 years of age respectively during the research period. The percentage of stem flow was 5.98% 7.94%, and 4.39% of total precipitation for 10 years, 15 years and 25 years of age respectively. The percentage of interception on rubber plantation for 10 years, 15 years and 25 years were 331.76 mm (19.6%), 428.73 mm (25.3%), and 545.79 mm (51.81%) of the total rainfall (1053.3 mm) respectively. Rubber plantation had good potency to reducing the net rainfall that reached the ground. This condition also informed that rubber plantation could reduce the risk of floods occurrence.Key words: rubber plantation, net rainfall, interception, through fall, stem flow

Potensi Tegakan Pada Hutan Lindung Bekas Pertambangan Tradisional Kabupaten Mandailing Natal (The Potential of Stands in the Former Traditional Mining Preserve Forest Mandailing Natal) Budi Utomo; Mohammad Basyuni; Mukti Batubara
FORESTA Vol 1, No 2 (2012): Indonesian Journal Of Forestry Volume 1 No. 2 (Juli 2012)
Publisher : FORESTA

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The effects of the damage of preserve forest will cause flooding in the rainy season, droughts during the dry season and disturbing watersheds within and outside the forest area. The purpose of this study was to evaluate the diversity of tree species, regeneration of stands and calculate the potential of forest stands in traditional mining, and preserve areas without mining. The method in this research is line, plot with 100 m length and a width of 20 m. Data analyzed by the Shannon-Winner’s diversity index. The results showed that we obtained 18 plant species of traditional mining and had middle tree diversity. In contrest, preserve forest with out mining, we found 29 plant species with high tree diversity ((H '=3.02). The potential stands of the tree level in the former traditional mining preserve forest was 76.28 m3/ha, and in the preserve forest without mining was 925.53 m3/ha. Traditional mining in the preserve forest significantly influenced the density of vegetation according to the result of the Wilcoxon rank test.Key Words: the potential of stands, traditional mining, protected forests, analysis vegetation, Mandailing Natal Regency.

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Contact Name
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Journal Mail Official
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Location
Kota medan,

Sumatera utara

INDONESIA