Effect of rice straw application on CH₄emission from paddy fields

Modelling methane emissions and grain yields for a double-rice system in Southern China with DAYCENT and DNDC models

“…Compared to no-tillage in the winter fallow season, winter tillage promotes the decomposition of rice stubble, which creates an anaerobic soil environment suitable for methanogenic activity because of oxygen consumption, and thereby enhanced observed/simulated CH 4 emissions in the winter fallow season ( Zhang et al, 2015 , Yang et al, 2018 ). By contrast, as the easily decomposable portion of the rice stubble has largely been decomposed during the whole winter fallow season, the positive effect of the remaining rice stubble (a less-decomposable part of organic matter) on CH 4 production and emissions is greatly reduced during the following seasons ( Watanabe and Kimura, 1998 , Bayer et al, 2015 ).…”

中国南方旱田转水田后温室气体减排年限预测

“…图 6 新稻田 N2O 通量与降水量 以为 CH4产生提供更多底物 [36][37][38] ， 而有实验研究表明 土地利用方式转换后的新转稻田土壤中的有机质 含量较低 [24] ； 与此同时， CH4氧化菌更适应较酸性条 件 [39,40] ， 在一定范围内， 土壤 pH 的降低会对 CH4排放…”

Modeling methane and nitrous oxide emissions from direct‐seeded rice systems

“…The timing of rice straw incorporation also affects growing season CH 4 emissions. When straw is incorporated at the end of the fallow period, immediately prior to rice cultivation, rather than the beginning of the fallow period, higher seasonal CH 4 emissions are typical [Lu et al, 2000a;Watanabe and Kimura, 1998;Xu et al, 2000]. Additionally, higher application rates of rice straw during the fallow period lead to higher CH 4 emissions in subsequent growing seasons [Lu et al, 2000a;Watanabe and Kimura, 1998;Xu and Hosen et al, 2010].…”