Evaluation of methane emissions from Taiwanese paddies
Resource
Science of The Total Environment 333 (1-3): 195-207
Journal
Science of the Total Environment
Journal Volume
333
Journal Issue
1-3
Pages
195-207
Date Issued
2004
Author(s)
Abstract
The main greenhouse gases are carbon dioxide, methane and nitrous oxide. Methane is the most important because the warming effect of methane is 21 times greater than that of carbon dioxide. Methane emitted from rice paddy fields is a major source of atmospheric methane. In this work, a methane emission model (MEM), which integrates climate change, plant growth and degradation of soil organic matter, was applied to estimate the emission of methane from rice paddy fields in Taiwan. The estimated results indicate that much methane is emitted during the effective tillering and booting stages in the first crop season and during the transplanting stage in the second crop season in a year. Sensitivity analysis reveals that the temperature is the most important parameter that governs the methane emission rate. The order of the strengths of the effects of the other parameters is soil pH, soil water depth (SWD) and soil organic matter content. The masses of methane emitted from rice paddy fields of Taiwan in the first and second crop seasons are 28,507 and 350,231 tons, respectively. The amount of methane emitted during the second crop season is 12.5 times higher than that emitted in the first crop season. With a 12% reduction in planted area during the second crop season, methane emission could be reduced by 21%. In addition, removal of rice straw left from the first crop season and increasing the depth of flooding to 25 cm are also strategies that could help reduce annual emission by up to 18%. © 2004 Elsevier B.V. All rights reserved.
Subjects
Emission; Methane; Rice paddy field; Sensitivity analysis
SDGs
Other Subjects
Agriculture; Carbon dioxide; Climate change; Crops; Degradation; Greenhouse effect; Mathematical models; Methane; Plants (botany); Soils; Booting; Emission rate; Tillering; Gas emissions; methane; soil organic matter; emission; methane; paddy field; rice; sensitivity analysis; article; climate change; degradation; greenhouse effect; pH; plant growth; priority journal; rice; soil; soil property; Taiwan; Agriculture; Environmental Monitoring; Hydrogen-Ion Concentration; Methane; Oryza sativa; Seasons; Soil; Taiwan; Temperature
Type
journal article
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