Mechanistic role of wildfire ash in mediating post-fire nitrogen transformation: A transient biogeochemical engine driven by fuel characteristics

In this study, wildfire ash samples were collected from combustion experiments conducted under various preset conditions. During combustion experiments, fire behavior indexes were recorded. Additionally, soil incubation experiments were performed in the laboratory to obtain soil samples. Subsequently, the properties of the wildfire ash, as well as the properties and mineral N content of the soil, were analyzed in the laboratory.