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Including legumes in the cereal cropping could improve the crop yield and the uptake of nitrogen (N) and phosphorus (P) of subsequent cereals. The effects of legume-cereal crop rotations on the soil microbial community have been studied in recent years, the impact on soil functional genes especially involved in P cycling is raising great concerns. The metagenomic approach was used to investigate the impacts of crop rotation managements of soybean-wheat (SW) and maize-wheat (MW) lasting 2 and 7years on soil microbial communities and genes involved in P transformation in a field experiment. Results indicated that SW rotation increased the relative abundances of  Firmicutes  and  Bacteroidetes , reduced  Actinobacteria ,  Verrucomicrobia , and  Chloroflexi  compared to MW rotation.  gcd ,  phoR ,  phoD , and  ppx  predominated in genes involved in P transformation in both rotations. Genes of  gcd ,  ppa , and  ugpABCE  showed higher abundances in SW rotation than in MW rotation, whereas  gadAC  and  pstS  showed less abundances.  Proteobacteria ,  Acidobacteria , and  Gemmatimonadetes  played predominant roles in microbial P cycling. Our study provides a novel insight into crop P, which requires strategy and help to understand the mechanism of improving crop nutrient uptake and productivity in different rotations.

Effects of Rotations With Legume on Soil Functional Microbial Communities Involved in Phosphorus Transformation