Oat/Soybean Intercropping Reshape the Soil Bacterial Community for Enhanced Nutrient Cycling

Summary

This field study evaluated how oat/soybean intercropping reshapes rhizosphere soil bacterial communities compared with monoculture at two sites in Northern China. Intercropping substantially altered bacterial community composition—increasing Bacteroidetes and Patescibacteria in oat rhizospheres whilst decreasing Patescibacteria and Nitrospirae in soybean rhizospheres—and these shifts correlated positively with enhanced nutrient availability and enzyme activities. The findings suggest intercropping is an effective practice for optimising nitrogen and phosphorus cycling through microbial community restructuring, with potential implications for sustainable soil nutrient management.

Regional applicability

This study was conducted in Northern China (semi-arid conditions) and may have limited direct applicability to United Kingdom temperate agricultural systems, which differ in climate, soil type, and existing microbiota. However, the mechanistic insights regarding intercropping-induced shifts in bacterial functional groups and nutrient cycling could inform intercropping strategies in UK arable and mixed farming systems, particularly for nitrogen and phosphorus cycling optimisation, though site-specific validation would be needed.

Key measures

Rhizosphere bacterial community structure and composition (relative abundance of phyla); soil parameters (available nitrogen, available phosphorus); nitrogen- and phosphorus-acquiring enzyme activities; bacterial co-occurrence networks

Outcomes reported

The study measured rhizosphere soil bacterial community structure, composition, and co-occurrence networks in oat/soybean intercropping versus monoculture systems at two field sites in Northern China. It assessed relationships between bacterial functional groups and soil nutrient parameters including available nitrogen, available phosphorus, and enzyme activities.

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