| Effects of maize stubble and straw mulching on rhizosphere soil bacterial community structure of continuous cropping potato |
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| DOI：10.7606/j.issn.1000-7601.2025.02.14 |
| Key Words: potato continuous cropping obstacle maize rotation straw mulching bacterial community in rhizosphere soil |
| Author Name | Affiliation | | LI Jinyu | School of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China | | XIE Kuizhong | School of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China
Potato Research Institute of Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | HU Xinyuan | Potato Research Institute of Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | DONG Bo | Gansu Academy of Agricultural Sciences Dryland Agriculture Research Institute, Lanzhou, Gansu 730070, China | | CHEN Songhu | School of Resources and Environment, Gansu Agricultural University, Lanzhou, Gansu 730070, China |
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| Abstract: |
| To investigate the effects of maize stumping and straw mulching on soils subjected to long\|term continuous potato cultivation, an experiment was conducted on a field that had been continuously planted with potatoes for eight years. Four treatments were applied: (1) a control without any treatment (CK), (2) maize stover mulching (T1), (3) maize stubble followed by maize stover mulching (T2), and (4) maize stubble fall treatment only (T3). The impact of maize stubble and straw mulching on the structure and diversity of inter\|root soil bacterial communities during the potato bud stage was analyzed using high\|throughput sequencing. The results showed that the abundance of potato inter\|root soil bacteria increased by 3.72% and 5.18% in T1 and T2, respectively, but decreased by 4.91% with maize stubble alone. Additionally, the diversity of potato inter\|root soil bacteria was significantly enhanced by maize stubble and straw mulching, with increases of 7.03%, 8.03%, and 3.43% in T1, T2, and T3, respectively, compared to CK, although these increases were not statistically significant. The similarity of the bacterial community structure of potato soil samples from different treatments was analyzed by clustering, and the treatments were divided into two groups according to the similarity of bacteria, the first group contained CK and T1, and the second group contained T2 and T3. The dominant populations of potato inter\|root soil bacteria under maize stubble and straw mulching were Actinobacteriota, Proteobacteria, Firmicutes, Chloroflexi, Acidobacteriota, Bacteroidota, Gemmatimonadota, and Myxococcota. Among them, Actinobacteriota increased by 10.89% in T1 compared to CK, and decreased by 4.83% and 8.78% in T2 and T3 compared to CK, respectively. Compared with CK, all three treatments of Proteobacteria increased, and T2 had the highest increase of 33.44%. Firmicutes decreased in all treatments compared to CK, with the highest decrease of 77.41% in T2 compared to CK. Chloroflexi increased by 29.09% in T1 compared to CK, and significantly increased by 41.03% in T2 and 34.45% in T3 compared to CK (P<0.05). Acidobacteriota increased in all treatments compared to CK, with 58.86%, 27.69%, and 35.27% increases in T1, T2, and T3, respectively. The results of the environmental factor correlation analysis revealed that soil total phosphorus and soil dehydrogenase were the primary environmental factors influencing the bacterial community in the rhizosphere soil. Maize stubble and straw mulching enhanced the soil microenvironment, significantly reducing the abundance of harmful bacterial genera, such as Bacillus, especially T2 treatment, which significantly reduced by 70.28%, effectively mitigated the spread and occurrence of potato diseases. |
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