**6.1 Effects of temperature on methane production**

Temperature is one of the major determining factors on the biological process (e.g., within the soil), which controls the CH4 production. Previous studies showed that increased soil temperature leads to an increase in CH4 production [35]. There is a lot of qualitative evidence showing that CH4 production from rice field increase with the increasing temperature [35]. A laboratory experiment regarding CH4 production from two rice cultures incubated at temperatures between 20 and 38°C showed Eα values of 41 and 53 kJ mol−1. CH4 production in anoxic paddy soil suspensions incubated between 7 and 43°C showed Eα values between 53 and 132 kJ mol−1 with an average value of 85 kJ mol−1 [36]. The paddy soil temperature could control the amount of CH4 production and there is a positive and strong correlation in both soil temperature and CH4 production pattern [37]. The effect of temperature on CH4 production in paddy soil was investigated by [38], they found that in continuously flooded soil, the temperature optimum for CH4 production was 40°C, however, this shifted to 45°C during a period of intermittent irrigation accompanied by a marked decrease in activity. The optimum temperature during the non-cropping season was also 45°C (**Figure 3**).
