水田和旱地土壤氧化甲烷的温度响应

为了探讨温度对农耕区土壤氧化CH4的影响，文中分别采用2种旱地（吉林暗棕壤和河北潮土）和2种水田土壤（江西水稻土和安徽水稻土）样品进行了4个温度下（5、15、25和35℃）氧化高浓度CH4的模拟实验研究。结果表明，4种土壤氧化高浓度CH。的最佳温度为25～35℃，除江西水稻土外，其余土壤在5和15℃没有表现出氧化高浓度...

Effect of temperature on methane oxidation in rice field and irrigative agriculture soil

Temperature affects methane oxidation in soils.We studied CH4 consumption in agricultural soils including dark brown earth(Jilin),fluvo-aquic soil(Hebei),and paddy soils(Anhui and Jiangxi) that were incubated at 5,15,25 and 35 ℃ for up to 44 days.All of the soils except paddy soils(Jiangxi) showed that the suitable temperature for CH4 consumption was 25-35 ℃,but no activity at 5 ℃ and 15 ℃.Both dark brown soil(Jilin) and paddy soil(Anhui) had similar ability at 25 ℃ and 35 ℃,the maximum average rates of CH4 oxidation were 4.42 μg·g-1·d-1and 5.60 μg·g-1·d-1.The average rate of CH4 oxidation of fluvo-aquic soil(Hebei) at 25 ℃ was twice as big as the rate at 35 ℃.Paddy soil(Jiangxi) could consume CH4 at any temperature.The average rates of CH4 oxidation increase with rising temperature and the rate at 35 ℃ was 3 times as the rate at 5 ℃.The maximum rate of CH4 oxidation at 25-35 ℃ follows this sequence:paddy soil(Jiangxi)>fluvo-aquic soil(Hebei)>paddy soil(Anhui)>dark brown earth(Jilin).We concluded that temperature can be an important factor affecting the CH4 consumption in agricultural soils and the temperature 25-35 ℃ would be suitable for CH4 oxidation than 5-15 ℃.Both dry farm and rice field had significant ability of CH4 consumption.This study will provide an important evidence for agricultural soil carbon pool research.