Efektivitas Jalur Hijau Jalan Dalam Mengurangi Polutan Gas No2 Di Jalan Tol Jagorawi
Abstract
Commonly, every big cities has a lot of factories and a high amount of
vehicles that contribute to the air pollution which can lead to the decreasing of
urban landscape quality. NO2 pollutant which is emitted by vehicles on the road
can be reduced by modifying a landscape such as utilization of roadside
vegetation. The aim of the research was to analyze the NO2 concentration
distribution and also to analyze the effectiveness of Mahoni (Swietenia
macrophylla) and Glodogan Bulat (Polyalthia fragrans) in reducing NO2
pollutant concentration in the air. This research was conducted in three different
parts of the roadside vegetation of Jagorawi highway, there were plot I which
vegetation was Mahoni (Swietenia macrophylla), Plot II which vegetation was
Glodogan Bulat (Polyalthia fragrans), and Plot III which did not has trees
(control). The canopy density of Mahoni vegetation (Plot I) and Glodogan Bulat
vegetation (Plot II) were analyzed by Leaf Area Index (LAI) Method using
Hemisphericalview Canopy Analyzer and measured by HemiView2.1 Canopy
Analyzer software. NO2 concentrations were analyzed by Griess-Saltzman method
performed by Inviromental research center, Bogor Agricultural University. The
purpose of leaves sampling of Mahoni and Glodogan Bulat vegetations at the
highway and BUPERTA (as a control) conducted on August 27th and September
27th in 2015 was to analyzed total N content on leaves as an indicator of NO2
absorption in the air. Total N content on leaves were analyzed by Kjendhal
Method at Agronomy and Horticulture (AGH) Laboratory. The results of the
analysis showed the distribution of NO2 concentration at Plot I (Mahoni) declined
52.1% and 84.8% in distance of 10 and 30 m respectivety. Meanwhile, the NO2
concentrations at Plot II (Glodogan Bulat) rise at 10 m distance on the
percentage of 21.1% and declined at 30 m distance on the percentage of 18.1%.
Plot III declining of NO2 concentrations tend to be consistent at a distance of 10 m
at 49.4% and 30 m at 43.3% from the pollutant source. The absorption effectivity
of NO2 by Mahoni was greater than control in the amount of 41.4% and also was
greater than Glodogan Bulat in the amount of 66.7%. The results of Leaf Area
Index (LAI) measurement showed that Glodogan Bulat has a higher canopy
surface than Mahoni. However, Mahoni effectiveness of NO2 absorption was
better than Glodogan Bulat. This was reinforced by the increasing of difference in
the percentage of total N of Mahoni leaves which were higher than Glodogan
Bulat leaves.
Collections
- UT - Landscape Architecture [1258]