Definition of 4C Rice Cultivation Source Category
The anaerobic decomposition of organic material in flooded rice fields produces methane, which escapes to the atmosphere by ebullition (bubbling up) through the water column, diffusion across the water/air interface, and transport through the rice plants. It is suggested that these CH4 emissions be based on lowland rice ecosystems without organic amendments relating to water regime, where lowland refers to fields flooded for a significant period of time. Correction factors for soils with organic amendments should be applied as necessary. Any N2O emissions from the use of nitrogen-based fertilisers in rice cultivation should be reported under 4 D Agricultural Soils.
United Nations Framework Convention on Climate Change (UNFCCC), Updated UNFCCC reporting guidelines on annual inventories following incorporation of the provisions of decision 14/CP.11. 2006.
Available online at: http://unfccc.int/resource/docs/2006/sbsta/eng/09.pdf
Revised 1996 IPCC Guidelines for National Greenhouse Gas Inventories: Reporting Instructions. Section 1.1, "Source/sink categories."
Available online at: http://www.ipcc-nggip.iges.or.jp/public/gl/guidelin/ch1ri.pdf