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Journal of Tropical Forest Science
Ministry of Natural Resources and Environment
Journal of Tropical Forest Science

Ministry of Natural Resources and Environment

0128-1283

Journal of Tropical Forest Science/Journal Journal of Tropical Forest ScienceEISCI
正式出版
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    DEVELOPMENT OF AN EFFICIENT MICROPROPAGATION PROTOCOL FOR EUCALYPTUS HYBRID (E. UROPHYLLA x E. GRANDIS) THROUGH AXILLARY SHOOT PROLIFERATION

    Nazirah, A.Nor-Hasnida, H.Mohd-Saifuldullah, A. W.Muhammad-Fuad, Y....
    7页
    查看更多>>摘要：Eucalypts, in the family of Myrtaceae, are a fast-growing timber able to adapt to marginal environments. In Malaysia, the Eucalyptus hybrid (E. urophylla x E. grandis) is becoming popular for plantation as it is more tolerant to disease and produces a straight bole. Micropropagation of axillary shoots from a healthy Eucalyptus hybrid mother tree was evaluated for shoot proliferation in Murashige and Skoog (MS) basal media and woody plant media (WPM), supplemented with 0.1, 0.5, 1.0, 2.0 and 3.0 mg L-1 6-benzylaminopurine (BAP), singly or in combination with 0.5, 1.0 and 2.0 mg L-1 1-naphthaleneacetic acid (NAA). The WPM and MS basal media supplemented with 0.1 mg L-1 BAP were found suitable for shoot multiplication as both media induced the production of new shoots and shoot elongation. Higher concentration of BAP and NAA produced stunted axillary shoots. Regenerated shoots were evaluated for root growth in half strength MS basal media supplemented with indole-3-butyric acid (IBA) or NAA at concentrations 0.5, 1.0, 2.0 and 3.0 mg L-1. Root produced and root lengths were not significantly different among media formulation, and it was observed that 0.5 mg L-1 IBA in 1/2 MS basal medium gave the best overall root production. Healthy regenerated plantlets were acclimatised in a weaning chamber for one month, and then planted in polybags filled with baked soil and peat moss (1:1). The plantlets were watered twice a day and kept under 50% shade in the nursery until ready to be transplanted into open field.
      原文链接:
    • NSTL
    • Forest Research Inst Malaysia

    NATURAL RESISTANCE OF BAMBUSA VULGARIS TO TERMITE AND POWDER-POST BEETLE ATTACK

    Sadiku, N. A.Bada, O. S.Oluyege, A. O.Ajayi, B....
    8页
    查看更多>>摘要：Deterioration is the major setback to the utilisation of bamboo products. To enhance bamboo utilisation, an understanding of the level of resistance to degradation is important. In this study, natural resistance of Bambusa vulgaris to attack by termites and powder-post beetle were evaluated. Bamboo aged 2, 3 and 4 years old were subjected to attack by subterranean termites and powder-post beetles for six month in a short span field tests. After exposure to attack by selected degrading insects, the weight loss was determined. There was significant variation in termite resistance among the three age classes, while no variation occurred along the culm length. In contrast to termite resistivity, resistance to powder-post beetles infestation varied significantly along the culm length from base to the top, while resistance among the three age classes were similar. Age 4 exhibited highest resistance to termites and were therefore placed in 'resistant' class, while age 3, basal and middle portion were moderately resistant. The resistance of B. vulgaris from all the age classes and culm portion against powder-post attack was poor. The findings showed that termite resistance depend on culm age while that of powder-post is indifferent to age or the culm portion.
      原文链接:
    • NSTL
    • Forest Research Inst Malaysia

    A DENSITY MANAGEMENT DIAGRAM FOR EVEN-AGED EUCALYPTUSDUNNIISTANDS IN SOUTHERN BRAZIL

    Krefta, S. M.Hess, A. F.Atanazio, K. A.Da Silveira, A. C....
    8页
    查看更多>>摘要：Density management diagrams (DMD) are graphic models that describe the forest stand dynamics, and they are extremely useful to regulate tree density. This study aimed to develop a DMD for Eucalyptus dunnii stands located in the municipality of Rio Negrinho, Santa Catarina, Brazil. Plots of 400 m2 were inventoried at the ages of 2, 3 and 4 years. The following variables were determined for the stands: the basal area per hectare, the number of trees per hectare and the geometric mean diameter. The Reineke model (1933) was fitted and its intercept value recalculated to define the maximum density line, reaching a determination coefficient of 0.5461. With the elaborated DMD of the current stand, a thinning can be simulated at 5.8 years with a cut at 7 years, taking into consideration a diametric increase of 2.41 cm. In addition, another scenario was simulated with thinning occurring at 4 and 6 years and a cut at 7.5 years. With the execution of this work, the DMD proved to be an efficient tool for the elaboration of forest management plans.
      原文链接:
    • NSTL
    • Forest Research Inst Malaysia

    META GENOMIC INSIGHTS ON SOIL MICRO BIOME BIODIVERSITY FROM AN ERODING COASTLINE OF TANJUNG PIAI, JOHOR STATE PARK, MALAYSIA

    Jeyanny, VNur-Nabilah, A.Norlia, B.Krishnasamy, G....
    11页
    查看更多>>摘要：The Tanjung Piai National Park is an important tourist attraction and has been severely affected by erosion and pollution, threatening its soil biodiversity. Microbes in mangroves control various nutrient transformation processes in the ecosystem and their population differ with regards to spatial variation. In our current efforts to elucidate the relationship between soil variables and bacterial population, we analysed high-throughput metagenomic datasets from two sites of an old growth mangrove and a severely eroded intertidal mudflat in Tanjung Piai National Park. Sediment samples were collected at 5-20 cm depth for analysis. Bacterial communities were investigated by throughput sequencing of the 16S rRNA gene. Soil pH, organic carbon, organic matter and nitrogen content significantly differed at both sites. Bacterial community structure revealed that sediments from both sites were dominated by phylum Proteobacteria (32-58%), followed by Chloroflexi (6-19%) and Bacteroidetes (2-5%). Intertidal mudflats had the highest numbers of operational taxonomic unit, as well as Proteobacteria (47%), Firmicutes (1%) and Spriochaetes (4%) compared with the old growth forest, which recorded the highest Bathyarchaeota (11%) population. Results revealed the sustenance of observed phylum in the soils of contrasting sites and call for future strategies in elucidating functional analysis of bacterial population in further understanding their roles in mangrove ecosystems.
      原文链接:
    • NSTL
    • Forest Research Inst Malaysia

    DEVELOPMENT AND CHARACTERISATION OF EST-SSR MARKERS FOR GENETIC ANALYSIS OF CASUARINA SPECIES

    Wang, Y. J.Bush, D.Li, Z.Zhang, Y....
    10页
    查看更多>>摘要：Simple sequence repeats (SSR) markers have greater advantages relative to other molecular markers in genetic analysis due to their Mendelian inheritance and co-dominance expression features. Numerous expressed sequence tags (EST) of genus Casuarina, now available from public databases, make it possible to develop EST-SSR markers with high efficiency at low cost. From the analysis of 12,063 EST derived from casuarinas, 367 SSR loci were identified from 352 unigenes, and the distribution frequency of SSR loci was 3.0%. The di- and trinucleotide accounted for 57.77 and 34.06% respectively. They comprised overwhelming majority in five types of repeat motifs of SSR, and AG/CT was the most predominant motif type of SSR. A total of 79 primer pairs were designed based on the non-redundant EST-SSR sequences, but only 21 were successfully amplified and generated polymorphic SSR products in four different Casuarina species and eight clones of C. equisetifolia. Eight primer pairs out of the 21 were applied for paternity analyses of open-pollinated progenies of one female individual of C. equisetifolia. At 95% confidence interval, 76 male individuals were identified as pollen parents of 262 out of 461 progenies, but at 80% confidence interval, 84 male individuals were identified as father trees of 328 out of the 461 progenies.
      原文链接:
    • NSTL
    • Forest Research Inst Malaysia

    EVALUATION OF AGARWOOD (AQUILARIA MALACCENIS) FROM BINTAN ISLAND BASED ON INDONESIAN STANDARD: PREDICTING ITS QUALITY USING NEAR-INFRARED SPECTROSCOPY

    Karlinasari, L.Pratama, N. A.NoviyantiPurwanto, Y. A....
    9页
    查看更多>>摘要：The agarwood grading system in Indonesia comprises physical properties, such as colour, weight and aroma. Agarwood resin content can be a simple guide for grading agarwood quality. Thus, this research aimed to evaluate the quality of agarwood (Aquilaria malaccensis) from Bintan Island based on Indonesian standard, and to determine its resin content, using near-infrared (NIR) spectroscopy (NIRS), as a predicting model for agarwood quality. The samples were obtained from community plantation forest in Bintan island which were inoculated by Fusarium solani. Agarwood chips were graded by its colour, weight and aroma, and were converted into powder samples for colour testing and NIRS acquisition, as well as laboratory testing for resin content determination. Results, according to SNI 7631-2011, showed the agarwood quality of gubal gaharu (agar) and kemendangan (dhum) where the colour of gubal gaharu was darker than kemendangan, showing that gubal gaharu had higher resin content (24.74%) than kemendangan (12.22%). The NIR spectroscopy analysis showed that the partial least square regression (PLSR) model could be used to predict the resin content with passable accuracy.
      原文链接:
    • NSTL
    • Forest Research Inst Malaysia

    SPECIES-ENVIRONMENT INTERACTION IN THE INTERIOR AND ON THE EDGE OF A SEMI-DECIDUOUS SEASONAL FOREST FRAGMENT

    Neto, Salim S. C.Pezzopane, J. E. M.da Silva, G. F.Ferreira, R. L. C....
    11页
    查看更多>>摘要：This study aimed at analysing the distribution of 40 tree species with the highest absolute density within a semi-deciduous seasonal forest fragment located in the municipality of Cachoeiro de Itapemirim, Espirito Santo, Brazil. There were 39 plots allocated for the study, consisting of 27 on the edge and 12 inside the fragment. The environmental variables used were: aluminium saturation, base saturation, soil moisture, leaf area index (LAI) and average slope. Canonical correspondence analysis using the CANOCO 2.1 program was applied to analyse the species-environment interactions on the edge and inside the fragment. Although the most striking heterogeneity in the fragment was related to the LAI and the land slope, the species showed the highest correlation with the soil characteristics (base saturation and aluminium saturation), suggesting that these species have generalist behaviour in relation to the availability of solar radiation in the environment and seek to establish their niche in the soil gradient. The results are helpful in increasing our understanding about the interactions between the species and the environmental variables involved in the study, enabling a more effective indication of them in forest restoration projects.
      原文链接:
    • NSTL
    • Forest Research Inst Malaysia

    INHERENT VULNERABILITY OF FORESTS: A CASE STUDY FROM JHARKHAND IN INDIA

    Langlentombi, L. C.Kumar, M.
    6页
    查看更多>>摘要：Vulnerability assessment of forests is essential for identifying the degree of associated risk under present and future scenario to prioritize management interventions. The specific objective of the present study is to assess the vulnerability of natural forests in Jharkhand, India under the current situation. The natural forests face multiple stresses in the present state can be prone to additional stress of climate change. We assessed the vulnerability of forests under the prevailing current situation using indicators. The assessment involves the use of four indicators such as biological richness, canopy cover density, disturbance index and slope. A multi-criteria approach was adopted to assign weights to each of the indicators which were integrated in a GIS environment to map the spatial extent of the vulnerability. The entire study area was first divided into 787 grids of size 2.5 ' x 2.5 ' to represent spatial extent of each indicators in the grids. The assessment indicated that only 2.92% forest grids fell under very high vulnerability class, whereas 18.68% grids came under high vulnerability, 53.88% were under medium and 24.52% grids were under low vulnerability classes. Very high vulnerability category of forested grids was largely located in Dry Peninsular Sal forests that required immediate management intervention.
      原文链接:
    • NSTL
    • Forest Research Inst Malaysia

    TRANSCRIPTOME AND CHEMICAL ANALYSIS OF HEALTHY AND INFECTED STEMS OF AQUILARIA MALACCENSIS

    Aimi-Wahidah, A.Rofiza, M.Saiful-Nizam, T.Aizi-Nor-Mazila, R....
    12页
    查看更多>>摘要：Aquilaria genus is an important source of agarwood and is widely used as incense, perfumery and ingredients in traditional medicines. The study investigated the genes and pathways controlling the molecular mechanism of A. malaccensis agarwood under controlled environment. Two transcriptome libraries were sequenced from mRNAs of both healthy and infected stem samples of A. malaccensis using Illumina sequencing. Total of 10,734,590 and 8,298,918 reads for both infected stems libraries and 6,274,184 reads for healthy stem library were identified. A total of 370,707 unigenes were functionally annotated using the gene ontology analysis. Infected white stem recorded higher reading of unigenes distribution in process related to plant defence mechanism compared to healthy stem. The de novo assembly and the gene ontology annotation data suggested that the infected white stem involved in plant defence response and produced agarwood compound. This study provided promising and valuable sequence resources for future genomic studies from stem of A. malaccensis as well as in depth study on molecular mechanism of agarwood formation and plant related defence responses.
      原文链接:
    • NSTL
    • Forest Research Inst Malaysia

    THE SOIL SEED BANKAS AN INDICATOR OF ALTITUDINAL GRADIENT IN A MONTANE TROPICAL FOREST

    Abreu, V. S.Dias, H. M.Kunz, S. H.van den Berg, E....
    9页
    查看更多>>摘要：The study was conducted in a portion of tropical montane forest in the Caparao National Park, Brazil. The aim of this work was to assess the changes in seed bank composition, density and richness along an altitudinal gradient and across seasons, and to analyse the floristic links between the forest soil seed bank, seed rain, regeneration layer and adult tree layer. The seed bank data were collected in the dry and rainy seasons at seven different elevations, ranging from 1112 - 1550 m above sea level. The floristic relationships were analysed through the species lists derived from previous studies at these same locations. The results showed seed density and species richness varied among different elevations, but did not vary with gradient. Seed bank density and richness varied significantly across seasons, with the highest averages found in the rainy season. In the floristic composition, the higher elevations showed more similar composition than to the lower elevations. Seed bank composition was floristically different from the seed rain, the regeneration layer and the adult tree layer of the forest. Our results showed that the soil seed bank was influenced by both altitude and environmental seasonality. The findings highlighted the importance soil seed bank as a mechanism of post-disturbance forest regeneration.
      原文链接:
    • NSTL
    • Forest Research Inst Malaysia