不同轮作模式对稻田土壤肥力和微生物群落结构的影响OA北大核心CSTPCD

Rotation patterns play a significant role in the ecologically sustainable development of rice cultivation.To evaluate the effects of different rice rotation patterns on soil microbial community structure and its relationship with soil nutrient supply,high-throughput sequencing technology was used to analyze variations in soil bacterial and fungal community compositions under three different rice rotation patterns[rice-wheat rotation,rice-Chinese milk vetch(CMV)rotation,and rice-fallow rotation].Then,the relationship of soil microbial variations with soil environmental factors was discussed.The results showed that the rice-CMV rotation system significantly improved the comprehensive fertility of paddy soil,and the contents of total nitrogen(TN)and available nitrogen(AN)in the soil were significantly increased after CMV was continuously rolled back into the field.Furthermore,the impacts of different rice rotation patterns on soil microbial community composition were greater for soil bacteria than soil fungi.In the rice-CMV rotation pattern,the enrichment of dominant bacteria such as Acidobacteriota and Ascomycota contributed to soil nutrient cycling and ecological health.Changes in soil nutrients such as TN,AN,total potassium(TK),and available potassium(AK)under different rotation patterns are supposed to be the main driving factors for the changes in soil bacterial and fungal community structures.In addition,the results indicated that the bacterial community structure in paddy soil was more sensitive to variations in environmental factors than the fungal community structure.In summary,our results showed that the rice-CMV rotation pattern was better than rice-wheat and rice-fallow rotation patterns for sustainable ecological rice cultivation and can significantly improve soil comprehensive fertility,thus enhancing the health of soil microecology.