Carbon Dioxide Absorption of Common Trees in Chulalongkorn University

Abstract

<p><span style="font-size: x-small;">This paper studies the relevance between carbon dioxide (CO</span>_{<span style="font-size: x-small;">2</span>}<span style="font-size: x-small;">) absorption rates of common trees in Chulalongkorn University (Thailand), and environmental factors -- light intensity, air temperature, leaf temperature, and CO</span>_{<span style="font-size: x-small;">2</span>}<span style="font-size: x-small;"> concentration in air -- by forming non-linear models. The common tree species are </span><span style="font-size: x-small;"><em>Pterocarpus indicus, Samanea saman, Peltophorum pterocarpum, </em></span><span style="font-size: x-small;">and</span><span style="font-size: x-small;"><em> Terminalia catappa</em></span><span style="font-size: x-small;">. Measuring CO</span>_{<span style="font-size: x-small;">2</span>}<span style="font-size: x-small;"> absorption was done by chamber analysis approach. The experiment was carried out by gauging 10 leaves, 7 hours per day, and 2 days per species. According to the models, it is obvious that light intensity is the most influential factor to CO</span>_{<span style="font-size: x-small;">2</span>}<span style="font-size: x-small;"> absorption for all studied species.</span><span style="font-size: x-small;"><em> Peltophorum pterocarpum</em></span><span style="font-size: x-small;"> and </span><span style="font-size: x-small;"><em>Samanea saman</em></span><span style="font-size: x-small;"> reach their maximum CO</span>_{<span style="font-size: x-small;">2</span>}<span style="font-size: x-small;"> uptake rates of 24.5 and 20.9 CO</span>_{<span style="font-size: x-small;">2</span>}<span style="font-size: x-small;"> µmol m</span>^{<span style="font-size: x-small;">-2</span>}<span style="font-size: x-small;">s</span>^{<span style="font-size: x-small;">-1</span>}<span style="font-size: x-small;">, when photosynthetically active radiation is 1100 and 1500 µmol m</span>^{<span style="font-size: x-small;">-2</span>}<span style="font-size: x-small;">s</span>^{<span style="font-size: x-small;">-1</span>}<span style="font-size: x-small;"> respectively. The other two do not reach their maximum rate within model data range. The regressions were best fitted with Gaussian function and Sigmoidal function. It is also suggested that </span><span style="font-size: x-small;"><em>Peltophorum pterocarpum</em></span><span style="font-size: x-small;"> and </span><span style="font-size: x-small;"><em>Samanea saman</em></span><span style="font-size: x-small;"> are good carbon sink and they should be planted more in the city for optimal CO</span>_{<span style="font-size: x-small;">2</span>}<span style="font-size: x-small;"> absorption.</span></p

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