Fig 1. Principle coordinate analysis (PCoA) plot (environmental variables as vectors) showing differences in bacterial community structure (a) and As functional gene structure (b) of the five As contaminated soils from different geographical locations.

Soil codes: B1, Faridpur, Bangladesh; B2, Sonargaon, Bangladesh; C1, Chenzhou, China; C2, Qiyang, China; UK, Rothamsted, UK.