Back to Search Start Over

Fly Ash Application Effects on CH4and CO2Emission in an Incubation Experiment with a Paddy Soil

Authors :
Han-Yong Kim
Kwang-Sik Yoon
Jae-Woon Jung
Woo-Jung Choi
Sang-Sun Lim
Source :
Korean Journal of Soil Science and Fertilizer. 45:853-860
Publication Year :
2012
Publisher :
Korean Society of Soil Science and Fertilizer, 2012.

Abstract

To estimate potential use of fly ash in reducing and emission from soil, and fluxes from a paddy soil mixed with fly ash at different rate (w/w; 0, 5, and 10%) in the presence and absence of fertilizer N () addition were investigated in a laboratory incubation for 60 days under changing water regime from wetting to drying via transition. The mean flux during the entire incubation period ranged from 0.59 to with a lower rate in the soil treated with N fertilizer due to suppression of production by that acts as an electron acceptor, leading to decreases in electron availability for methanogen. Fly ash application reduced flux by 37.5 and 33.0% in soils without and with N addition, respectively, probably due to retardation of diffusion through soil pores by addition of fine-textured fly ash. In addition, as fly ash has a potential for removal via carbonation (formation of carbonate precipitates) that decreases availability that is a substrate for reduction reaction (one of generation pathways) is likely to be another mechanisms of flux reduction by fly ash. Meanwhile, the mean flux during the entire incubation period was between 0.64 and , and that of N treated soil was lower than that without N addition. Because N addition is likely to increase soil respiration, it is not straightforward to explain the results. However, it may be possible that our experiment did not account for the substantial amount of produced by heterotrophs that were activated by N addition in earlier period than the measurement was initiated. Fly ash application also lowered flux by up to 20% in the soil mixed with fly ash at 10% through removal by the carbonation. At the whole picture, fly ash application at 10% decreased global warming potential of emitted and by about 20%. Therefore, our results suggest that fly ash application can be a soil management practice to reduce green house gas emission from paddy soils. Further studies under field conditions with rice cultivation are necessary to verify our findings.

Details

ISSN :
03676315
Volume :
45
Database :
OpenAIRE
Journal :
Korean Journal of Soil Science and Fertilizer
Accession number :
edsair.doi...........377fc074865c2dab6fdc16de3f6c29fe
Full Text :
https://doi.org/10.7745/kjssf.2012.45.5.853