Pedosphere 9(1): 1--10, 1999
ISSN 1002-0160/CN 32-1315/P
©1999 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Modeling methane emission from rice paddy soils: Ⅰ. Model development |
| HUANG Yao1, R. L. SASS2 and F. M. FISHER2 |
1 Coldege of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095 (China);
2 Department of Ecodogy and Evolutionary Baology, Race Unaversity, Houston, TX 77005-1892 (USA) |
| ABSTRACT |
| With an understanding of the processes of methane production, oxidation and emission, a semi-empirical model, focused on the contributions of rice plants to the processes and also the influence of environmental factors, was developed to predict methane emission from rice paddy soils. In the present model, the amount of methane transported from the soil to the atmosphere was determined by the rates of CH4 production and an emitted fraction. The rates of CH4 production in irrigated rice soils were computed from the availability of methanogenic substrates that are primarily derived from rice plants and added organic matter and the influence of soil texture, soil redox potential and temperature. The fraction of methane emitted was assumed to be modulated by the rice plants and declines with rice growth and development. To make it applicable to a wider area with limited data sets, a simplified version of the model was also derived to predict methane emission in a more practical manner. |
| Key Words: CH4 emission, global warming, greenhouse gases, modeling, rice paddy soils |
| Citation: Huang, Y., Sass, R. L. and Fisher, F. M. 1999. Modeling methane emission from rice paddy soils: Ⅰ. Model development. Pedosphere. 9(1): 1-10. |
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