[Rhizosphere bacterial metabolism of plants growing in landfill cover soil regulates biodegradation of chlorobenzene].

The regulation of rhizosphere bacterial community structure and metabolism by plants in municipal solid waste landfills is a key to enhancing the biodegradation of chlorobenzene (CB). In this study, we employed biodiversity and metabolomics methods to systematically analyze the mechanisms of different plant species in regulating the rhizosphere bacterial community structure and metabolic features and then improved the methane (CH) oxidation and CB degradation capacity. The results showed that the rhizosphere soil of exhibited the highest CH oxidation and CB degradation capacity of 0.08 g/(kg·h) and 1.72×10 g/(L·h), respectively, followed by the rhizosphere soil of L., with the rhizosphere soil of showing the weakest activity. promoted the colonization of in the rhizosphere, and the small-molecule organic amine, such as triethylamine and N-methyl-aniline, secreted from the roots of this plant enhanced the tricarboxylic acid cycle and nicotinamide metabolism, thereby increasing microbial activity and improving CH and CB degradation efficiency. Conversely, cinnamic acid and its derivatives secreted by acted as autotoxins, inhibiting microbial activity and exacerbating the negative effects of salt stress on key microbes such as methanotrophs. This study probed into the mechanisms of typical plants growing in landfill cover soil in regulating bacterial ecological functions, offering theoretical support and practical guidance for the plant-microbe joint control of landfill gas pollution.