Microbial linkages to soil biogeochemical processes in a poorly drained agricultural ecosystem

Soil microorganisms mediate biogeochemical processes, but how microbial community composition influences these processes remains contested. We combined monthly sequencing of soil 16S rRNA genes and intensive measurements of nitrogen (N), carbon (C), and iron (Fe) cycling along a topographic gradient in a poorly drained intensive agricultural ecosystem (corn–soybean rotation) in the midwestern United States. Observed microbial composition changed...