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Sumatera utara
INDONESIA
FORESTA
Published by Universitas Sumatera Utara
ISSN : 20899390     EISSN : -     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol 1, No 1 (2012): MARET" : 6 Documents clear
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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Abstract

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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Abstract

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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Abstract

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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Abstract

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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Abstract

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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Abstract

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

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