Effects of plant species on soil microbial processes and CH4 emission from constructed wetlands

► The polyculture constructed wetland has the higher contribution to CH4 emission. ► The CH4-C conversion ranged from 0 to 3.7%. ► The Z. latifolia played important roles in methanotrophs growth and CH4 consumption. ► Major influence of T-N, TOC and plant cover on CH4 emission was obtained.