Effects of Different Crop Rotations on Microbial Diversity and Enzyme Activities in Brassica napus Rhizosphere Soil
Xiaona Tian, Jia Duan, Hongli Huo, Jiuru Huangfu, Mengjiao Yan, Huilin Lu, Ziqin Li, Peiling Song
TL;DR
Rotating crops with wheat improves soil health and microbial diversity in rapeseed fields more than other rotations.
Contribution
Identifies wheat as the optimal preceding crop for enhancing microbial diversity and enzyme activity in Brassica napus rhizosphere soil.
Findings
Wheat rotation (TaBn) showed the highest soil enzyme activities and microbial diversity indices.
Wheat and beet rotations (TaBn, BvBn) significantly altered microbial community structure compared to continuous Brassica napus.
Wheat rotation enriched beneficial bacterial phyla like Pseudomonadota and Actinomycetota.
Abstract
Continuous cropping of Brassica napus impairs sustainable production via soil nutrient imbalance and microecological degradation. We evaluated rhizosphere soil properties and microbial communities under rotations crops (Triticum aestivum [TaBn], Beta vulgaris [BvBn], Glycine max [GmBn], Sorghum bicolor [SbBn], Hordeum vulgare [HvBn], and Brassica napus [BnBn]). BvBn had the highest total nitrogen, total potassium, available potassium, and organic matter contents. TaBn exhibited the highest soil enzyme activities, and its bacterial/fungal Chao1/Simpson indices and unique operational taxonomic units (OTUs; bacteria: 333, fungi: 37) exceeded other patterns. Principal coordinate analysis showed distinct microbial community separation in BvBn/TaBn versus BnBn. TaBn enriched dominant bacterial phyla Pseudomonadota and Actinomycetota; all preceding crops increased fungal phylum Ascomycota…
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Taxonomy
TopicsPlant-Microbe Interactions and Immunity · Soil Carbon and Nitrogen Dynamics · Nitrogen and Sulfur Effects on Brassica