MODEL OF TREES APPRAISAL USING AN INTERNATIONAL SHADING TREE EVALUATION METHOD AT THE CILIWUNG RIPARIAN AREA, INDONESIABudi Susetyo, Hadi Susilo Arifin, Machfud, Widiatmaka and Nurhayati H.S. Arifin
Riparian zones are globally dominated by illegal settlements leading to reduced green open space area (GOS) and negative ecological impacts. Several tree appraisal methods were implemented in many researches in the world, such as ISA formula-Texas, CTLA-USA, Burnley-Australia, Helliwell-UK, STEM-New Zealand and Norma Granada-Spain. Commonly, the methods considered the basic value, species of tree, condition and location aspect of the tree. The main objective of this research is to evaluate trees value around the Ciliwung riparian area. The current research is a case study of the Ciliwung riparian area of Bogor City, Indonesia. Tree appraisal method in this research is ISTEM (International Shading Tree Evaluation Method), as the modification of ISA formula. The total researched area was approximately 303.84 ha, which consisted of a buffer area of 200 meters on either side of the river up to a distance of 15.19 km from the Ciliwung River, limited to Bogor City. The land cover consisted of a settlement area of 58% and a GOS area of 42%. Potential trees were evaluated using the standard sampling plot method with three repetitions of each type of structure (i.e. rare, moderate and dense areas) depending on the density of building (settlement) and density of standing trees (GOS). The percentage of standing trees area in the settlement were; rare area 12% of total settlement area, moderate area 17%, and dense area 30%, while in the GOS the values were rare area 8% of total GOS area, moderate area 16%, and dense area 8%. Total tree values for 2014 were calculated to be US $ 16.791.234. Current dynamic model was designed to estimate the projected trees value until the year 2030. Three scenarios developed resulted in trees yield value of U.S. $ 64,706,109 (optimistic); U.S. $ 78,556,923 (moderate), and U.S. $ 93,623,117 (pessimistic). The finding of research is implementation of trees appraisal model using ISTEM to predict the potential trees value in the river riparian through the urban area in Indonesia. Hence the model should serve as a tool for new regulations formulation of riparian management.
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