Estimation of Soil Carbon Flux in Cultivated Areas with Aquilaria crassna, Hevea brasiliensis, and Oryza sativa L.

บทคัดย่อ

The objective of this study is the evaluation of soil carbon storages in cultivated areas withAquilaria crassna, Hevea brasiliensis, and Oryza sativa L. at Non Pueai sub-district, Kudchum district, Yasothon province. The experimental plot in this study was 50 x 50 meters. The sample collection was analysed for physical and chemical soil properties. The physical properties consisted of soil bulk density, soil temperature, soil texture and soil moisture. The properties were composed of total Nitrogen (N), available Phosphorus (P), the available Potassium (K), Organic carbon (OC), Soil organic matter (OM), and pH in soil. This study calculated soil carbon storages in various land use patterns.
       The results of soil carbon flux in the cultivated areas with Aquilaria crassna, Hevea brasiliensis, and Oryza sativa L. were 67.20, 77.44, and 20.24 tons-carbon/rai/year, respectively. The total of soil carbon flux was 164.88 tons-carbon/rai/year. The average of available Phosphorus (P) was 0.61 mg/kg in Oryza sativa L. plantation, the average of available Potassium (K) was 3.06 mg/kg in Oryza sativa L. plantation, and the average of total Nitrogen (N) was 0.093 mg/kg in Oryza sativa L. plantation. Moreover, most of soil organic matter (OM) was 2.42% and organic carbon (OC) was 1.4% in Aquilaria crassna plantation. The average soil temperature was 31.55 °C and the rainy season was the most appropriate period for degradation of litter by microorganism in the soil. All average amounts of soil carbon flux depend on the rates of soil organic matter and activities of microbes in the soil as well.