The spatiotemporal variation rules of methane from landfill gas was studied by using a self-made equipment in measuring the concentration of fermentative methane generated from a temporary garbage dump in Hengyang. The results showed the concentration of methane took on obvious gas stratification,and was positively correlated with the vertical depth of the landfill but negatively correlated with the horizontal distance from the boundary of the landfill. At the initial stage of landfilling,in the same horizontal direction,the closer to the ground,the concentration of methane varied greatly in d...