Dissertation : Effectivity of Roadside Vegetation in Reducing Lead Particle Emitted by Motor Vehicle (Case Study Acacia mangium Greenbelt, Jagorawi Highway)
R. Hermawan, C. Kusmana, N. Nasrullah & L.B. Prasetyo
Reducing lead concentration in ambient air is supposed to be affected by structure of roadside vegetations. One of the structure factors is number of rows. The objectives of the research were : (a) to determine the effects of the number of plant rows in reducing lead concentration; (b) to know a capturing pattern of Pb particle on leaves in roadside vegetation; (c) to study dispersion pattern of Pb particle in surrounding roadside vegetation. Determining Pb particle concentration were conducted in point emission (roadside), 5 m, 15 m and 30 m behind greenbelt; besides of that, it also was conducted in openspace plot. To know pattern of capturing Pb particle on leaves was conducted to observe on front and back crown on three tree in first rows. Interpolation Kriging Method with software ArcGIS9.3.1 was used to arrange dispersion pattern of Pb particle. The results showed that differences of tree row number affected decreasing Pb particle concentration; the more tree row numbers was the greather in reducing Pb particle concentration. There is a trend that further from the roadside, the reducing level of lead concentration is higher. Pb particle concentration on leaves decrease according to distance from emission sources. Isopleth of Pb particle concentration decrease gradually from emission source.
Keywords: Pb particle, roadside vegetation, capture