Japanese Journal of Southeast Asian Studies
Online ISSN : 2424-1377
Print ISSN : 0563-8682
ISSN-L : 0563-8682
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Volume 20, Issue 4
Displaying 1-7 of 7 articles from this issue
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  • Soils of Swampy Coastal Areas in Southeast Asia:
    Part 2. Organic Soils under the Swamp Forest
    Kazutake Kyuma
    1983 Volume 20 Issue 4 Pages 492-511
    Published: March 31, 1983
    Released on J-STAGE: May 31, 2018
    DOIhttps://doi.org/10.20495/tak.20.4_492
    JOURNAL FREE ACCESS
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    The vast area of tropical peat land in Southeast Asia represents an impotrant fraction of potentially cultivable land. Tropical peat develops under swamp forest in the freshwater environment of the low coastal zone. Most is deep ombrogenous peat of the raised-bog type, and thus extremely oligotrophic in nutritional status.
     This paper reviews the process of formation, physical and chemical characteristics, and classification of tropical peat, and discusses in detail problems that these characteristics raise in attempts at reclamation. Continuous land subsidence due to dewatering, compaction and decomposition of peat is particularly serious when deep peat is drained for reclamation. Deficiencies in both major and minor elements of oligotrophic peat are no less a problem than subsidence. After disappearance of peat due to decomposition, moreover, the underlying clay may develop into acid sulfate soil. Another unsolved problem in the utilization of peat is the failure of grain formation of paddy rice, which is otherwise the crop most adapted to peat land.
     It is tentatively concluded that only a few percent of total tropical peat land may be reclaimed successfully, and the rest should be conserved as natural swamp forest.
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  • Landuse and Soil Catena in Jeneponto Area of South Sulawesi
    Hisao Furukawa
    1983 Volume 20 Issue 4 Pages 512-527
    Published: March 31, 1983
    Released on J-STAGE: May 31, 2018
    DOIhttps://doi.org/10.20495/tak.20.4_512
    JOURNAL FREE ACCESS
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  • Wet and Dry Analysis for the Cagayan Valley, the Philippines
    Huynh Ngoc Phien, Carlos C. Tan
    1983 Volume 20 Issue 4 Pages 528-547
    Published: March 31, 1983
    Released on J-STAGE: May 31, 2018
    DOIhttps://doi.org/10.20495/tak.20.4_528
    JOURNAL FREE ACCESS
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    In this first step toward a regional analysis of wet and dry events, the theory of runs is coupled with a multi-site data generation technique in order to serve two purposes. The first one is to define the parameters of the wet and dry events in terms of the runs-characteristics such as the run-length and run-sum, thus placing the wet and dry analysis within the scope of statistical and probabilistic treatment. The multi-site data generation scheme incorporates the inter-dependence (in space and time) between the data at various stations in a region into the analysis.
     This approach is illustrated by a simulation study using the rainfall data at nine stations in the Cagayan Valley located in the Northern part of Luzon Island of the Philippines. The duration, magnitude and intensity of the wet and dry events are obtained for different demand levels.
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  • A Comparative Study of Crude Drugs in Southeast Asia, Part XIII:
    Jamu Materials in Yogyakarta (2)
    Aya Nitta
    1983 Volume 20 Issue 4 Pages 548-563
    Published: March 31, 1983
    Released on J-STAGE: May 31, 2018
    DOIhttps://doi.org/10.20495/tak.20.4_548
    JOURNAL FREE ACCESS
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    This article deals with 45 kinds of Indonesian drug (jamu) materials collected in Yogyakarta, comprising plant materials, namely, fruit (22), seed (12), herb (3), and others (4), animal material (1) and minerals (3). These materials represent the remainder of the collection described in the first part of this report [18,19(4): 456–472].
     In total 88 kinds of material were found in Yogyakarta. About 50% of materials in each of three shops were the same.
     The parts of plant, most commonly found were the flower, fruit and seed, which together accounted for 45–50% of materials, least common were leaf and herb. This distribution of plant parts used differed significantly from that of Chinese drug materials.
     Record of 84 vegetable materials was sought in both Indian and Chinese literature. Sixty-eight (81%) and 40 (48%) of them were found respectively in both Indian and Chinese literature, and 37 (44%) in both. This suggests that jamu materials may be based on Indian medicine with the recent addition of a few Chinese drugs.
     Of the 12 identified local Indonesian materials, nine seemed to be indigenously Javanese, one a substitute for an Indian material, one to have been introduced from Sumatra, and one from Malaysia.
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