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ESTIMATION OF METHANE FLUX RATE FROM PADDY FIELDS OF SOUTH GUJARAT REGION (INDIA)


Author(s):

Darshana T. Bhatti , VVP Engineering College, Rajkot, Gujarat

Keywords:

Global Warming Potential, Growth stage, Flux rate, Chromatograph, Days After Flooding (DAF)

Abstract:

Methane (CH4) is a potent greenhouse gas with high absorption potential for infrared radiation. In the flooded paddy fields, when organic material is fermentatively decomposed, in the strict anaerobic conditions, methanogenic bacteria, produce CH4 gas. South Gujarat region is a major rice growing area of Gujarat-India, so in the present study, methane flux measurements have been made from paddy fields in the Ankleshwar during kharif season. A closed chamber made up of Acrylic material was used to cover the plants. Samples from this chamber were collected using bladders and sucking tubes at different rice growing stages like tillering stage, panicle stage and milk grain stage. The correction factor for moisture and temperature was applied to the results. The methane flux value estimated from the analysis of these samples were mostly in the range of 4.662-34.783 mg/m2-hr. Hence the average flux during entire rice growing season was 19.720 mg/m2-hr. Overnight flux during the season ranged between 12.572 - 26.426 mg/m2-hr. These preliminary results, from natural fields, gave the flux value nearer to Intergovernmental Panel on Climate Change (IPCC) default values for continuously flooded fields for India.[4] In South Gujarat region paddy cultivation area is 0.238 Mha. Hence Total annual methane emission from this region was calculated as 0.118 Tg/year.


Other Details:

Manuscript Id :IJSTEV1I5043
Published in :Volume : 1, Issue : 5
Publication Date: 01/12/2014
Page(s): 29-35
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