High Level of Iron Inhibited Maize Straw Decomposition by Suppressing Microbial Communities and Enzyme Activities

In order to study the linkages between crop straw decomposition rate and change in soil biological properties after returned with different iron (Fe2+) contents, a 180-day incubation experiment was performed examine of maize (MS) under three Fe2+ levels, i.e., 0, 0.3, 1 mg g−1. Enzyme activities regarding microbial communities 0 g−1 Fe addition were also detected. The results showed that significantly inhibited MS decomposition. This evidenced by higher contents hemicellulose, cellulose, lignin treatments on day 180. High-Fe (1 g−1) decreased activity Laccase (Lac) 71.82% compared control 30. Furthermore, principal coordinates analysis (PCoA) indicated high-Fe mainly affected bacterial community. particular, it suppressed relative abundance Microbacteriaceae phylum Actinomycota that, turn, is potential decomposer secreting lignocellulolytic enzymes. A high level reducing Actinobacteria bacteria suppressing Lac activity. Our findings provide guidance for returning straws soils content.