Objective Composition and diversity of rhizosphere bacterial community in response to straw-mulching and soil conditioning on land of maize field were studied.
Methods Soil at the maize growing fields was treated with either no chemical fertilizer (CK), a single chemical fertilizer (T1), straw-mulching and chemical fertilization (T2), or a soil conditioner plus chemical fertilization (T3). The second-generation technology of Illumina Miseq high-throughput sequencing was used based on the bacterial 16S rRNA genes in V3-V4 region to determine the changes of diversity, richness, composition, and structure of bacterial community in the rhizosphere soil under treatment.
Results The dominant bacteria, which showed their relative abundance greater than 10%, in the rhizosphere bacterial community were 4,183 genera of Proteobacteria, Chloroflexi, and Actinobacteria. The ACE and Chao 1 richness indices of the community under T1 were 17.65% and 17.88%, respectively, lower, while those under T3, 14.52% and 14%, respectively, higher than those under CK. At genera level, the stratified cluster diagram of community structure under T3 differed from those under CK, T1, and T2.
Conclusion T3 significantly affected the structure of the bacteria community and more so than did the other treatments. Among all treatments, T1 lowered, while T3 enhanced, the richness of the community over CK. And the added soil conditioner raised the pH of the acidic soil rendering the greatest effect on the rhizosphere bacterial community in maize field.
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