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Different fertilization treatments in coal mining-affected soils change bacterial populations and enable soil reclamation
Annals of Microbiology ( IF 3.0 ) Pub Date : 2020-07-23 , DOI: 10.1186/s13213-020-01589-2 Yanzhuan Cao , Bingrui Zhou , Xiangying Wang , Huisheng Meng , Jian Zhang , Li Li , Jianping Hong
Annals of Microbiology ( IF 3.0 ) Pub Date : 2020-07-23 , DOI: 10.1186/s13213-020-01589-2 Yanzhuan Cao , Bingrui Zhou , Xiangying Wang , Huisheng Meng , Jian Zhang , Li Li , Jianping Hong
Coal mining activities result in large-scale soil degradation and ecosystem imbalances in many countries. Fertilization is an effective way to improve soil fertility and microbial activity. However, the effect of different fertilizers and remediation time on the subsided soil is not clear. The aim of this study is to explore the effects on soil fertility and the bacterial community. In this study, we compared three fertilization regimes (inorganic, organic, and combined) applied over a 5-year period for the purpose of rehabilitating subsoil through measurement of soil’s chemical properties and microbial biomass. Bacterial diversity was evaluated in different reclaimed soils via high-throughput 16S rDNA sequencing; 1,938,561 total sequences were obtained. The results showed that fertilization improved various soil properties, including the concentrations of available phosphorus, available potassium, and alkali-hydrolysable nitrogen, therefore, increasing microbial biomass. A significant increase in soil microbial diversity was observed in fertilized soils compared to the initial conditions. A positive correlation between microbial diversity and soil properties was observed. Regarding an improvement in soil properties and crop yields, the organic fertilizer demonstrated significantly more effectiveness compared to the inorganic fertilizer. Meanwhile, the relative abundance of Proteobacteria, Bacteroidetes, and Verrucomicrobia increased, but the relative abundance of Chloroflexi and Nitrospirae decreased. More specifically, we found that several Proteobacteria subgroups, such as Rhizobiales, Myxococcales, Sphingomonadales, Rhodospirillales, Xanthomonadales, and Burkholderiales, increased after the restoration. Additionally, the composition of the bacterial community in the 5-year groups (M5, O5, and MO5) was similar to the composition of the FS group, and the yield of the maize test crop following the 5-year restoration period was close to the average in China. This result indicates that soil reclamation via fertilization can contribute to soil recovery over time. Therefore, we concluded that fertilization is an effective strategy for the restoration of soil properties and bacterial communities in mining soil.
更新日期：2020-07-23
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