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  ISSN: 0857-0841 (Print)
  ISSN: 2630-029X (Online)

"Article Journal of Agriculture"
Volume 34 Issue 3 September 2018 , ISSN 0857-0841
Title. : Organic Carbon in Soil Aggregates Induces Methane and Carbon Dioxide Formation in Paddy Soils
Author : Wut Sriwichai, Daungsamorn Tulaphitak, Phrueksa Lawongsa and Patcharee Saenjan
Page : 399-409
index word : อินทรีย์คาร์บอนในดิน(Soil organic carbon) มีเทน(methane) คาร์บอนไดออกไซด์(carbon dioxide) เม็ดดิน(soil aggregate)
The objective of this study was to determine organic carbon types and soil aggregate sizes Induce in methane (CH4) and carbon dioxide (CO2) formation in paddy soils. Loam and sandy loam soil were studied. Each soil was separated into 6 aggregate-size fractions : <4 mm (bulk soil), 4-2 mm (large macro-aggregate, LMa), 2-1 mm (medium macro-aggregate, MMa), 1-0.25 mm (small macro-aggregate, SMa), 0.25-0.053 mm (micro-aggregate, Mi) and <0.053 mm (fine micro-aggregate, FMi). Each aggregate fraction was uncrushed and crushed. Soil organic carbon (SOC) and labile organic carbon (LOC) content as well as non-LOC:SOC ratio were determined. Each soil-aggregate fraction (uncrushed and crushed) was anaerobically incubated for 14 days and measured for CH4 and CO2 production potential. The results found that LOC was more suitable source of SOC induced for CH4 and CO2 production potential than non-LOC was. Average LOC contents of loam and sandy loam were 0.78 mg/kg and 0.70 mg/kg, while average non-LOC:SOC ratio were 0.94 and 0.90, respectively. LOC content and non-LOC:SOC ratio of loam were significantly more than those of sandy loam. In loam soil, CH4 formation locations were founded a lot in aggregate sizes of 2-1 mm followed by 1-0.25 mm and 4-2 mm, while in sandy loam soil was in 2-1 mm. CO2 formation of loam soil was located more in aggregate size of 2-1 mm, while of sandy loam soil were 2-1 mm, <0.053 mm and 1-0.25 mm.
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