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| Effects of Different Treatments on Structure and Diversity of Soil Bacterial Community in Pepper Continuous Cropping Soil |
| XUE Guoping1，BAI Hongmei1，DU Jinwei1，ZHU Chunxia1，FU Chongyi1，JIANG Wei1*，SONG Qingcheng2，LI Jie3，GUO Huanhuan4，ZHANG Xiaomei3 |
| 1Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences，Hohhot 010031，Inner Mongolia，China；2Ningcheng County Agriculture and Animal Husbandry Technology Promotion Center，Ningcheng 024200，Inner Mongolia，China；3Chifeng Academy of Agricultural and Animal Husbandry Sciences，Chifeng 024031，Inner Mongolia，China；4Tongliao Agricultural Technology Promotion Center，Tongliao 028000，Inner Mongolia，China |
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Abstract Taking soil with 20 years pepper continuous cropping as research object，this paper set up 4 treatments，including：returning decompoed corn straw to fields，wheat filling，adding anti-crop biological bacterial fertilizer，weibaimu fumigation and disinfection，etc.；and took pepper continuous cropping soil without any amendment as the contrast．The paper explored the effect of different treatments on composition of soil bacterial community and diversity in pepper continuous cropping soil．The results showed that returning decompoed corn straw to fields，wheat filling，adding anti-crop biological becterial bacterial fertilizer，all had significantly increased Chao1 index and Shannon index．And the diversity index of treatment by adding anti-crop biological bacterial fertilizer was the highest．Different treatments had extremely significant effect on bacterial community structure of pepper continuous cropping soil．At the phylum level，treatments of returning decompoed corn straw to fields and wheat filling had significantly increased the relative abundance Gemmatimonadetes．Treatment of returning decompoed corn straw to fields and weibaimu fumigation and disinfection had significantly increased the relative abundance of Actinobacteria．All these 4 treatments had significantly increased the relative abundance of Verrucomicrobia．Weibaimu fumigation and disinfection treatment had significantly increased the relative abundance of Firmicutes and decreased that of Proteobacteria．At the genus level，4 treatments had significantly increased the relative abundance of Flavisolibacter．Treatments of returning decompoed corn straw to fields，wheat filling and adding anticrop biological bacterial fertilizer had significantly increased the relative abundance of Steroidobacter and Terrimonas．Treatments of returning decompoed corn straw to fields，and wheat filling significantly increased the relative abundance of MND1 and Haliangium．Treatments of returning decompoed corn straw to fields，and adding anti-crop biological bacterial fertilizer had significantly increased the relative abundance of Subgroup_10 and Niastella．The wheat filling treatment had significantly increased the relative abundance of Bacillus．Adding anti-crop biological bacterial fertilizer had significantly increased the relative abundance of Sphingomonas，Pseudomonas，and Streptomyces．To sum up，treatments of returning decompoed corn straw to fields，wheat filling and adding anti-crop biological bacterial fertilizer had better effect，and the effect of weibaimu fumigation and disinfection treatment was the worst．
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Received: 01 August 2022
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