Importance of rice root oxidation potential as a regulator of CH4 production under waterlogged conditions

Aboveground morphological traits do not predict rice variety effects on CH4 emissions

“…Thus, differences in CH 4 emissions among rice varieties should primarily stem from the effect of rice plants on the belowground processes (CH 4 production and/or oxidation in soil). These results are in consistent with the increasing recognition of the importance of belowground processes over methane emissions (Aulakh et al, 2001;Gutierrez et al, 2014;Kerdchoechuen, 2005;Lee et al, 2014). Relative to the indirect effect of aboveground plant traits on the CH 4 emission, rice roots play an important role in all CH 4 -related processes, contributing to the direct impact on the CH 4 emission.…”

Effect of rice cultivars on yield-scaled methane emissions in a double rice field in South China

“…Thus, the yield-scaled approach may provide a tool to address dual goals of increasing rice production and environmental sustainability (Pittelkow et al 2014). Most previous studies have relied on pot or lab incubation (Ma et al 2010;Gutierrez et al 2014), and little long-term synthetic research on the yieldscaled GWP of rice production has been conducted (Zheng et al 2013). This has impeded the demonstration of the low carbon technologies by optimizing rice varieties.…”

“…Of the total methane emitted from a rice field during the growing season, 60-90% is transported through the rice plants rather than through molecular diffusion across water-air interfaces or through the release of gas bubbles (Holzapfel-Pschorn et al 1986;Schütz et al 1989;. Rice plant have three key functions regulating the methane budget (Setyanto et al 2004;Zheng et al 2013): (1) as a source of methanogenic substrate through root exudates and/or dead root cells Kerdchoechuen 2005); (2) as a channel for methane through well-developed intercellular air spaces (aerenchyma) in leaf blades, leaf sheaths, culms and roots of rice plants, which provide an effective channel for gas exchange (methane transport capacity (MTC)) between the atmosphere and the anaerobic soil (Raskin & Kende 1985;Butterbach-Bahl et al 1997;Shao & Li 1997;Aulakh et al 2000;Fu et al 2007);and (3) as an active methane oxidizing site in the rice rhizosphere by supporting oxygen counter transport through the aerenchyma system (Win et al 2012;Gutierrez et al 2014).…”

Effect of Plant Spacing and Organic Fertilizer Doses on Methane Emission in Organic Rice Fields

“…Delay of soil reduction is caused by the ability of roots to oxidize by diffusing O2 from the atmosphere to the rhizosphere through aerencyhma. So, that it is one of the important characteristics in rice cultivation which can control CH4 production (Gutierrez et al, 2014). Therefore, the presence of PFA with tight plant spacing causes jarwo 2:1 have lower total CH4 emission than tegel.…”