International Journal of Environmental Science and Development

Abstract—The propose of this study was to evaluate CO2 flux and accumulative CO2 absorbance of the first ratoon cane by using Eddy Covariance Technique. First ratoon cane was produced at Cane and Sugar Industry Promotion Center, Kanchanaburi province, from June 2010 to April 2011. From the results, the CO2 flux was fluctuated from -2.4 to 2.8 mgCO2m-2s-1. The negative values showed in the day time and it means CO2 was absorbed by plant via photosynthesis. On the other hand the positive values means CO2 was emitted by plant and soil respiration in night time. Different CO2 flux was observed in each growth stages. CO2 flux was lower at germination stage (June 2010) and the total CO2 absorbance at this stage was 63.1 gCO2m-2. CO2 flux reached its maximum at stalk elongation stage (September 2010-January 2011) and total CO2 absorbance at this stage was 2,448.3 gCO2m-2. Totally, CO2 absorbance for the entire period of experiment was 4,300.4 gCO2m-2. Carbon use efficiency of the 1st ratoon cane was 2.13 tyield/tCO2. From the results, it was concluded that the 1st ratoon sugarcane ecosystem was a CO2 source during night hours and a CO2 sink during the day time. Finally, for the entire growing season the 1st ratoon cane system is the sink of CO2.

Index Terms—Carbon use efficiency, eddy covariance technique, first ratoon cane.

T. Pakoktom and N. Chaichana are with the Department of Agronomy, Faculty of Agriculture at Kamphaeng Saen, Kasetsart University, Kamphaeng Saen Campus, Thailand (e-mail: agrtwp@ku.ac.th; nongpat.chai@gmail.com).
J. Phattaralerphong is with the Faculty of Natural Resource and Agro-Indrustry, Kasetsart University, Chalermprakiat Sakon Nakorn, Thailand (e-mail: csnjdp@ku.ac.th).
J. Sathornkich, is with the Department of Horticulture, Faculty of Agriculture Kasetsart University, Bangkok, Thailand (e-mail: psdjate@ku.ac.th).

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Cite:Tiwa Pakoktom, Nongpat Chaichana, Jessada Phattaralerphong, and Jate Sathornkich, "Carbon Use Efficiency of the First Ratoon Cane by Eddy Covariance Technique," International Journal of Environmental Science and Development vol. 4, no. 5, pp. 488-491, 2013.