Abstract
China has the world's largest area of rice paddy. As such, emissions of methane (CH 4) from China are of interest in understanding the global CH 4 budget. Using a simplified process-based methane emission model and a georeferenced database, CH 4 emission rates from 329 defined agricultural zones in China, where rice production occurred, were estimated in this study. The calculated daily CH 4 emission rates ranged from 0.12 g m −2 to 0.70 g m −2 with an average value of 0.44 g m −2. The annual CH 4 emissions varied between 25 g m −2 and 80 g m −2. On average across the whole rice growing area in China, 59.9 g m −2 CH 4 was released annually. Total CH 4 emission was 16.2 Tg year −1 (1 Tg = 10 12 g). Although the model and supporting database used had some uncertainties, these results demonstrated the ability to assess CH 4 emissions at the regional level within the framework of climate-plant-soil interactions.
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