(A) Plasmids and their containing ARGs retrieved from landfill leachate samples by using PlasFlow (contigs without annotated taxa information); the red and blue nodes represented the identified ARGs and plasmids (identity >75%, coverage >75%); the dark yellow nodes denoted the leachate samples with different landfill ages. (B) Percentage of collected landfill leachates genera attributable to various environmental setting origins (%) including air/dust, soil, fresh and saline water biome (water, sediments), animal and human-associated waste (feces, sebum, saliva) concerning three landfill stages by using SourceTracker2.