Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8364744 | Soil Biology and Biochemistry | 2014 | 12 Pages |
Abstract
Methane (CH4) is a potent greenhouse gas and the huge CH4 fluxes emitted from paddy fields can prejudice the eco-compatibility of rice cultivation. CH4 production in submerged rice crops is known to be highly influenced by water temperature. Hence, lowering ponding water temperature (LPWT) could be an option to mitigate CH4 emissions from paddy environments when it is possible either to irrigate with slightly colder water or to increase ponding water depth. However, paddy soil is a complex environment in which many processes are simultaneously influenced by temperature, leading to a difficult prediction of LPWT effects. For this reason, LPWT efficiency is here theoretically investigated with a one-dimensional process-based model that simulates the vertical and temporal dynamics of water temperature in soil and the fate of chemical compounds that influence CH4 emissions. The model is validated with literature measured data of CH4 emissions from a paddy field under time-variable temperature regime. Based on modeling results, LPWT appears promising since the simulated reduction of CH4 emissions reaches about â12% and â49% for an LPWT equal to â5 °C during the ripening stage only (last 30 days of growing season, when rice is less sensitive to temperature variations) and â2 °C over the whole growing season, respectively. LPWT affects CH4 emissions either directly (decreasing methanogenic activity), indirectly (decreasing activity of bacteria using alternative electron acceptors), or both. The encouraging results provide the theoretical ground for further laboratory and field studies aimed to investigate the LPWT feasibility in paddy environments.
Related Topics
Life Sciences
Agricultural and Biological Sciences
Soil Science
Authors
A. Rizzo, F. Boano, R. Revelli, L. Ridolfi,