Versatile diazotrophs drive multiple heavy metal(loid) transformation in long-term mercury-impacted farmland soils

Multiple heavy metal(loid)s (HMs) contamination caused by mining activity leads to notorious legacy effects on biodiversity and multi-services of surrounding soils. Diazotrophs are of great importance for supplying bioavailable nitrogen and supporting primary productivity. Here we systematically evaluated the taxonomical profile and functional potential of diazotrophic community in historic mercury (Hg) mining-impacted farmlands (upland and paddy soils) with HMs pollution gradients.