Wiharto, Muhammad, Indonesia

  • Forum Pasca Sarjana Vol. 31 No. 3 (2008): Forum Pascasarjana - Articles

    The aims of this research is to study various vegetation associations on Mount Salak.  Sampling was done by using systematic sampling with random start. Cluster analysis was used to determine the vegetation association.  The relationship between abiotic factors and vegetation association was analyzed using Chi-Square statistic.  There are 5 vegetation associations at alliance 1, 6 associations at alliance 2, and 7 associations at alliance 3.  Calcium, phosphorus content of soil, soil’s texture and slope direction are the abiotic factors that affected the association at alliance 1.  Calcium and phosphorus content of soil, and minimum altitude of plot are abiotic factors that affected the association at alliance 2.  Phosphorus content of soil and minimum altitude plot are the abiotic factors that affected the association at alliance 3.

     

    Key words: Mount Salak, vegetation association, cluster analysis, chi-square statistic
    Abstract  PDF
  • Forum Pasca Sarjana Vol. 31 No. 1 (2008): Forum Pascasarjana - Articles

    One of the important factors for the management activity at Salak Mountain is the presence of Salak Mountain’s vegetation classification, which until recently has never been done. The research objectives were to classify the variety of vegetation types at Salak Mountain. Vegetation sampling was made with systematic sampling with random start. Vegetation type at alliance level was determined with vegetation ordination. Three vegetation alliances can be extracted from the ordination. These alliances are Shcima walichii-Pandanus punctatus/ Cincora sinensis forest alliance; Glocidion apus-Mallotus blumeana/Chima sinensis forest alliance; and Pinus merkusii-Dysoxiylum arborescens/Dysoxiylum dichotoma forest alliance. Vegetation alliances are forming mainly because of their similarity in their structure, composition, and physiognomy of vegetation. The abiotic factors that consistently differentiate alliance 1 with the other alliances are N total, dust content of the soil, and slope. P soil’s content is the abiotic factor that consistently differentiates alliance 2 with the other alliances, while C organic soil’s content and cation exchange capacity of the soil are the abiotic factors that consistently differentiate alliance 3 with the other alliances. There are five vegetation association at allinace 1, six alliance 2 and seven at alliance 3. Each dominant spesies has uniquely preference to abiotic factor in their distribution at Gunung Salak. Stand structures of alliance 1 and 3 forming J reverse curve.

     

    Key words: association, ordination, Salak Mountain, vegetation alliance, vegetation classification
    Abstract  PDF
  • Forum Pasca Sarjana Vol. 32 No. 4 (2009): Forum Pascasarjana - Articles
    The research objective was to study tree's vegetation structure based on diameter class distribution on varians vegetation types at Salak Mountain.  Samples were taken at north, south, east, and west facing slope of Salak Mountain using line transect.  Systematic sampling with random start was used to locate the transetcs.  Measuring stem diameter at breast height was done in order to study the tree diameter class distribution.  Non parametric U Man Whitney statistic was used to know whether there was a different in number of individual at all diameter class in each vegetation type.  At mix forest and plantation forest, the tree diameter class distribution forming J curve shape.  At bamboo forest, the individual number increase at the highest class diameter.  The number of individual trees were highest at mix forest and lowest at bamboo forest. Key words: Mount Salak, Reverse J Curve, tree diameter class,  vegetation type
    Abstract  PDF