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METHANE EMISSIONS FROM WETLAND RICE AREAS OF ASIA
Citation:
Bachelet, D. AND H. Neue. METHANE EMISSIONS FROM WETLAND RICE AREAS OF ASIA. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/J-93/149.
Description:
Kahlil and Rasmussen (1990) reviewed eleven global methane budgets published between 1978 and 1988. hey found methane emissions from rice paddies ranged from 18 to 280 Tg year-1 which correspond to between 10 and 70% of the total anthropogenic methane emissions. or this paper, we have reviewed and replicated three published techniques to estimate methane emissions from rice paddies. e present the results obtained and propose to include soil characteristics to revise these estimates. ince 90% of rice production occurs in Asia, we have focused our study on rice in Asia. he first technique we replicated uses the Food and Agriculture Organization (FAO)'s country statistics and crop calendars to determine the land area under rice cultivation each month. The second technique assumes that methane emissions represent a constant fraction of the net primary production and uses empirical relationships between net primary production and temperature and precipitation ecords. he third technique related methane emissions to rice grain roduction. e propose to se a classification of rice soils to categorize rice growing locations from potentially methane producing to non-methane producing area. sing this distinction with any of the three ethods e discussed, Asian rice fields emissions are then reduced by about 25%.