The Temperature Sensitivity Of Potential Methane Production In Soils From Three Marshes In The Min River Estuary

Based on global warming, the response of methane production to temperature elevated was an important link to correctly understand the relationship between global climate change and methane emissions in marshes. Using fixed parallel temperature, and taking into two directions, the vertical section of the soil and the incubation time, we studied the response of potential methane production to temperature elevated in an incubation experiment, which the soil samples taken from Cyperus malaccensis marsh, Phragmites australis marsh and Spartina alterniflora marsh in the Minjiang River Estuary.The results showed that:(1)The response of potential methane production to temperature has no obvious regulation followed by the soil depth, but the potential methane production was increases with temperature at the same depth in C. malaccensis marsh and P. australis marsh.(2)The relationship between temperature and potential methane production was well simulated by the Exponential model. When the temperature between20℃to30℃, the temperature sensitivity of potential methane production between topsoil and soil profile was great difference in Cyperus malaccensis marsh. For Phragmites australis marsh, it was more sensitivity in lowwer temperature. For Spartina alterniflora marsh, the temperature sensitivity of potential methane production has no significant difference between topsoil and soil profile, except higher temperature level in growing period.(3) The potential methane production were more sensitivity at higher temperature level for Cyperus malaccensis marsh and Spartina alterniflora marsh, both growing and non-growing period. But for Phragmites australis marsh, it was only more sensitivity in non-growing period at higher temperature level.(4)The potential methane production was positive correlation with temperature in the same marsh. The highest values of potential methane production was appeared in P. australis marsh in the same temperature, the P. australis marsh followed it, and the lowest values was appeared in C. malaccensis marsh.