Estimation of methane emission from rice paddy soils in Japan using the diagnostic ecosystem model

Abstract

AbstactIt is needed to accurately evaluate the methane emission from paddy fi elds at a national scale for both scientifi c and political purposes. The existing approaches have shared a common issue with obtaining the realistic information on spatiotemporal variations of crop management. Satellite sensor could possibly detect them, but the methodology to link the satellite observations to the methane emission has not been established. In this study, we enhanced the existing diagnostic satellite-driven paddy ecosystem model, the Biosphere model integrating Eco-physiological And Mechanistic approaches using satellite data for regional Cropland BEAMS-C Sasai et al., 2012 , by integrating the methane processes and examined the potential of this approach by comparing the estimated nation-wide methane emission with that by the existing approaches. The carbon fl ux estimations had good agreements with the measurements at the Mase paddy fl ux site. In regional-scale analyses in Japan, methane emission averaged from 2001 to 2010 was 15.0 gC m -2 year -1 , which was similar to the Tire-1 and -2 results. If we have a continuing improvement of the diagnostic approach, it could be one of the most effi cient tools for estimating the methane fl ux at national scales.

Agronomic performances of aromatic and non-aromatic M1 rice under drought stress

“…CH 4 emission that come from flooded rice fields is estimated to reach 60 Tg yr -1 and contribute to around 11% of total CH 4 emission globally (Chowdhury and Dick 2013). It is known that the increase of CH 4 emission happens along with the expanding production area and intensification of rice cultivation, especially the flooded rice fields (Burney et al 2010;Sasai et al 2017). Therefore, the effort to reduce CH 4 emission on flooded rice fields can bring significant contribution to control the global warming (Feng et al 2012).…”

Theoretical Analysis of Engineered Plants for Control of Atmospheric Nitrous Oxide and Methane by Modification of the Mitochondrial Proteome

“…Submerged rice culture emits an average of 2.2 kg CH 4 ha −1 d −1 during the growing season, 72,101,102 which is much less than the calculated potential removal (about 25 kg CH 4 ha −1 d −1 ), suggesting that MMO expressing rice could prevent CH 4 emissions from rice fields. This calculation neglects the potential additional uptake of CH 4 in the aerenchyma as it passes through shoot tissue and leaf uptake of CH 4 emitted by diffusion or ebullition from the submerged soil surface as it rises through the plant canopy.…”