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| Effects of different crop rotation combinations of cabbage, kidney bean, and maize on bacterial community and crop yield in light brown soil |
| Received:October 27, 2021 |
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| KeyWord:crop rotation;soil bacterial;bacterial diversity;bacterial community structure |
| Author Name | Affiliation | E-mail | | WANG Tianle | College of Agronomy, Shanxi Agricultural University, Taigu 030801, China
Shanxi Institute of Organic Dryland Farming, Shanxi Agricultural University, Taiyuan, 030031, China
State Key Laboratory of Sustainable Dryland Agriculture(in Preparation), Shanxi Agricultural University, Taiyuan 030031, China
Shanxi Key Laboratory of Organic Dryland Farming, Shanxi Agricultural University, Taiyuan, 030031, China | | | WANG Xiaojuan | Shanxi Institute of Organic Dryland Farming, Shanxi Agricultural University, Taiyuan, 030031, China
State Key Laboratory of Sustainable Dryland Agriculture(in Preparation), Shanxi Agricultural University, Taiyuan 030031, China
Shanxi Key Laboratory of Organic Dryland Farming, Shanxi Agricultural University, Taiyuan, 030031, China | juanwxj@126.com | | LIU Enke | Shanxi Institute of Organic Dryland Farming, Shanxi Agricultural University, Taiyuan, 030031, China
State Key Laboratory of Sustainable Dryland Agriculture(in Preparation), Shanxi Agricultural University, Taiyuan 030031, China
Shanxi Key Laboratory of Organic Dryland Farming, Shanxi Agricultural University, Taiyuan, 030031, China | | | SHI Xiangyuan | Shanxi Institute of Organic Dryland Farming, Shanxi Agricultural University, Taiyuan, 030031, China
State Key Laboratory of Sustainable Dryland Agriculture(in Preparation), Shanxi Agricultural University, Taiyuan 030031, China
Shanxi Key Laboratory of Organic Dryland Farming, Shanxi Agricultural University, Taiyuan, 030031, China | |
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| Abstract: |
| Soil bacterial community and crop yield are affected by different combinations of continuous cropping and rotation. Cabbage(C), kidney bean(B), and maize(M) commonly grown in northern dry land were selected and used for this study. The experiment comprises a total of ten crop rotation combinations under three crop rotations:CMC, BMC, CCC, CMB, BMB, BBB, CCM, CBM, BBM, and BCM. Illumina HiSeq high-throughput sequencing and physicochemical test methods were used to study the changes in bacterial community structure and diversity in topsoil under the ten cropping rotation modes. To provide basis for rational crop rotation of cabbage, kidney bean, and maize in semiarid region of light brown soil, the effects of different changes on crop yield were analyzed. The results showed that there was a little difference in the OTUs and there was no difference in the richness of bacteria. The OTUs specific to CCC treatment was two, while the OTUs specific to BMC, CMB, CCM, CBM, and BCM treatment was one. The richness index of soil bacteria in BCM treatment was significantly lower than that in CCC treatment. Compared with that of CCC treatment, Ace index of BCM treatment decreased by 2.6%, while Chao1 index decreased by 2.5%. The shannon index of soil bacteria in CMC, BMC, CCC, BMB, CCM, and BBM treatments was significantly higher than that in CBM treatments by 3.3%~3.6%. Compared with those in continuous cropping treatment, the changes in relative abundance and community structure of bacteria in CBM treatment were the largest, followed by BCM treatment. Compared with CCC treatment, crop rotation reduced richness and diversity of soil bacteria. Proteobacteria, Acidobacteria, and Bacteroidetes were the dominant phyla in CMB and BMB treatments. The dominant phyla in other treatments were Proteobacteria, Acidobacteria, Bacteroidetes, and Firmicutes. Proteobacteria was the phylum with the largest relative abundance in each treatment. Compared with those of soil bacteria under continuous cropping, the relative abundance and community structure of soil bacteria under CBM treatment changed the most. It significantly reduced the relative abundance of Proteobacteria, Chloroflexi, and Actinobacteria but increased the relative abundance of Bacteroidetes. Abundance cluster heatmap of bacteria at genus level showed that CMC, BBB, and CCM treatments were more similar to BMC, BBM, and BCM treatments in terms of soil bacterial community, followed by CCC, CMB, and BMB treatments with CMC, BMC, BBB, CCM, BBM, and BCM treatments. CBM treatment had the greatest difference in bacterial communities compared with the remaining nine treatments. Although, there was no significant change in crop yield, CMC, BMB and BBM treatments had the highest yield. In general, kidney bean-kidney bean-maize was the best crop rotation combination. |
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