Biotechnology Bulletin ›› 2025, Vol. 41 ›› Issue (4): 312-322.doi: 10.13560/j.cnki.biotech.bull.1985.2024-0645

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Effects of Rotating Cropping and Continuous Cropping on Soil Nutrients, Enzyme Activities and Microbial Community Structure of Rhizosphere Soil in Tobacco

ZHAO Chun-duo1(), LI Yu-e2, LIU You-jie2, WANG Xin-hang3, ZHAO Wei3, HUANG Yong-cheng3, LI Hu-lin1, JI Wen-xiu1()   

  1. 1.Yanbian University, Yanji 133002
    2.Jilin Tobacco Industry Co. , Ltd. , Yanji 133000
    3.Jilin Tobacco Company Changchun Tobacco Company Liuhe Tobacco Company, Tonghua 135300
  • Received:2024-07-07 Online:2025-04-26 Published:2025-04-25
  • Contact: JI Wen-xiu E-mail:2735175249@qq.com;jwxlyq@ybu.edu.cn

Abstract:

Objective Continuous planting of tobacco for many years will lead to the deterioration of soil microbial ecological environment, the aggravation of diseases and the reduction of quality, while corn-tobacco rotation can effectively alleviate the obstacles by continuous cropping. It is aimed to clarify the effects of rotating cropping and continuous cropping on rhizosphere soil and microecology of Jiyan 9, and to provide theoretical support for alleviating the obstacles by tobacco continuous cropping and farmland soil detection and restoration. Method The experiment was carried out in the tobacco planting demonstration field of Sanyuanpu town, Liuhe county, Tonghua city, Jilin province in 2023, and the rhizosphere soil of maize-tobacco rotation and tobacco continuous cropping was taken as the research object. The soil nutrients and enzyme activities of rotating croppng and continuous cropping were determined, and the microbial community structure and diversity were analyzed based on 16S rDNA and ITS sequences. Result Rotating cropping significantly increased the total nitrogen, available potassium, organic matter content, urease and protease activities in rhizosphere soil, and significantly reduced peroxidase activity. Compared with continuous cropping, rotating cropping significantly increased the diversity and richness of rhizosphere soil bacterial community. There was no significant difference in fungal community diversity between the two planting modes, and continuous cropping significantly increased the richness of rhizosphere soil fungi (P<0.05).The relative abundance of Gematimonas in the rotating cropping mode was significantly higher than that in continuous cropping, and the relative abundance of fungi such as Penisilium, Astrostroma and Fusariumsignificantly increased in continuous cropping compared with rotating cropping. Continuous cropping induced the enrichment of oxidative phosphorylation,pyruvate metabolism related microbial communities in the rhizosphere of tobacco. Rotating cropping can promote the aggregation of functionally related microorganisms such as nitrate reduction and aromatic compound degradation, promote soil nutrient cycling, and inhibit potential pathogenic bacteria. Gemmatimonas was positively correlated with total nitrogen, available potassium, organic matter content, urease and protease activities. Penicillium, Asterostroma, Fusarium were positively correlated with total phosphorus content and peroxidase and phosphatase activities. Conclusion Maize-tobacco rotation can effectively improve soil fertility, make bacteria more abundant, and increase the proportion of indicator beneficial bacteria, while continuous cropping leads to a large number of pathogenic bacteria. The increase in the relative abundance of pathogenic fungi may be the main factor leading to the occurrence of tobacco continuous cropping disorder. This study provides theoretical support for alleviating tobacco continuous cropping obstacles and soil detection and remediation in farmland.

Key words: tobacco, rotating cropping, continuous cropping, soil nutrients, enzyme activity, microbial structure