| Effects of continuous cropping on bacteria community in oil flax soil |
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| DOI：10.7606/j.issn.1000-7601.2022.01.08 |
| Key Words: oil flax continuous cropping high\|through put sequencing soil bacterial community |
| Author Name | Affiliation | | WANG Liguang | Biotechnology Research Institute Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | YE Chunlei | Biotechnology Research Institute Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | CHEN Jun | Biotechnology Research Institute Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | Li Jinjing | Biotechnology Research Institute Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China | | LUO Junjie | Biotechnology Research Institute Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070, China |
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| Abstract: |
| In this study, the samples of the soil being planted oil flax for one year, continuously planted for two or three years were collected to determine the influence of different continuous cropping years on the bacterial community and diversity in the soil.The results showed that the number of bacteria OUT （1773）and the abundance index（Chao index 1 759.07 and Ace index 1 741.89）of bacteria community were the highest after three\|year continuous cropping, but the diversity of bacterial community（Shannon index T1(6.45）＞T2（6.41）＞T3(6.33), Simpson index T1(0.0034）＜T2（0.0037）＜T3(0.0074))decreased with the increase of continuous cropping years. A total of 36 phylum of bacteria were isolated from the samples of oil flax soil with different continuous cropping years. The 12 dominant phylum（＞0.01）were the same in different samples. They were Proteobacteria, Acidobacteria, Actinobacteria and Chloflexi, etc.The abundance of the dominant phylum was different in each sample. With the continuous cropping time increased, the abundance of Proteobacteria（T1（31.74%）＞T2（27.69%）＞T3(25.21%）) gradually decreases, the abundance of Acidobacteria （T1 19.39%,T2 21.99%,T3 14.28%） and Bacteroidetes(T1 7.29%,T2 8.72%,T3 2.59%)increased first and then decreased. The abundance of Actinobacteria（T1（12.16%）＜T2（15.38%）＜T3(24.12%）) and Chloflexi（T1（9.58%）＜T2（10.99%）＜T3(11.82%）) gradually increased. Beta diversity analysis of bacterial community showed that continuous cropping significantly changed the structure of soil bacterial community, and the effect increased with continuous cropping years. All the findings in this experiment indicated that continuous cropping of oil flax decreased the diversity of soil bacteria and affected the structure of bacterial community. |
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