| Effects of biocontrol agents on fungal community diversity and structure in rhizosphere soil of continuous cropping celery |
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| DOI：10.7606/j.issn.1000-7601.2024.02.07 |
| Key Words: celery continuous cropping microbial agent soil physical and chemical properties fungal community structure mountainous area of southern Ningxia |
| Author Name | Affiliation | | FENG Haiping | Institute of Horticulture,Ningxia Academy of Agriculture and Forestry Sciences,Yinchuan, Ningxia 750002, China | | CHEN Zhuo | Institute of Horticulture,Ningxia Academy of Agriculture and Forestry Sciences,Yinchuan, Ningxia 750002, China | | YANG Hu | Institute of Horticulture,Ningxia Academy of Agriculture and Forestry Sciences,Yinchuan, Ningxia 750002, China |
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| Abstract: |
| To provide a theoretical basis for alleviating the obstacles of continuous cropping of celery in the mountainous area of southern Ningxia, a field positioning experiment combined with high\|flux sequencing technology was used to study the effects of conventional fertilization + mixed bactericides (MF), conventional fertilization + Bacillus subtilis (BS), and conventional fertilization + Trichoderma harzianum (TH) on fungal diversity and community composition of rhizosphere soil of celery in continuous cropping for 4 years, using conventional fertilization as a control (CK). The results showed that the application of Bacillus subtilis and Trichoderma harzianum compound bacteria increased the content of available phosphorus and available potassium in soil, with an increase of 34.29% and 9.98%, respectively. The application of microbial agents increased the activities of urease and sucrase, with an average increase of 43.16% and 12.98%, respectively, and significantly changed the β-diversity of soil fungi. Mortierella, Plectosphaerella, Gibberella, Alternaria, Fusarium were the dominant genera in each treatment. The application of compound microbial agent of Bacillus subtilis and Trichoderma harzianum treatment significantly reduced the relative abundance of fungal pathogens such as Gibberella, Alternaria and Fusarium by 59.88%, 51.63%and 36.13%, respectively. Redundancy analysis showed that sucrase, urease, alkaline phosphatase, pH and total phosphorus were the main driving factors affecting the composition of the fungal community. In summary, the application of compound microbial agent of Bacillus subtilis and Trichoderma harzianum not only reduced the enrichment of pathogens such as Fusarium, Alternaria, and Gibberella, but also further reshaped the soil fungal community structure by changing soil physical and chemical properties such as available phosphorus and potassium. |
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