关键词: 有机物料, 贫瘠稻田, 土壤, 相对丰度, 微生物群落

Abstract: To investigate the effects of different organic materials returning on the soil microbial community structure in infertile paddy fields, a 7-year （2013—2019） positioning experiment was conducted. Six treatments were set up: no fertilization (T1), conventional fertilization (T2), rapeseed straw returning + chemical fertilizer (T3), broad bean straw returning + chemical fertilizer (T4), rice straw returning + chemical fertilizer (T5), and commercial organic materials + chemical fertilizer (T6). High-throughput sequencing technology was used to analyze the structure of soil bacterial and fungal communities. The results showed that the addition of organic materials did not significantly affect the number of microbial OTUs or the α-diversity index, but it significantly altered the community structure.Compared with T1 or T2, T3, T4, and T6 significantly changed the relative abundance of bacterial phyla in the soil, including Hydrogenedentes, Cyanobacteria, Bacteroidetes, Patescibacteria, Omnitrophicaeota, Fibrobacteres, and Gemmatimonadetes; T3 and T6 significantly altered the community composition of the fungal phyla Basidiomycota, Mortierellomycota, and Chytridiomycota. Community structure analysis further indicated that T4 had a significant impact on the soil bacterial community structure, while T4, T5, and T6 all significantly affected the soil fungal community structure. Regarding the predicted gene copy numbers in Level 2 functional categories, only the relative abundance of the anticancer drug resistance gene in T5 was lower than that in T1, with no significant differences observed in other Level 2 functional categories.

Key words: organic materials, infertile, paddy field, soil, relative abundance, microbial community