Effect of Pennisetum sp. and its different growth periods on physical-chemical properties and bacterial diversity in sandstone areas

Abstract:

[Objective] This study aimed to analyze the effect of Pennisetum sp. in different growth stage on soil physical-chemical properties and bacterial community structure, and provide a theoretical basis for better application of Pennisetum sp. to improve soil in Pisha sandstone area. [Methods] We used Illumina MiSeq sequencing to compare the effect of Pennisetum sp. in different growth stage on soil bacterial community structure. [Results] After planting Pennisetum sp., the water content of each plot was lowest in tillering stage and highest in maturity period. The soil organic content increased and soil pH did not change significantly. The dominant bacteria of every plot obtained at phylum level were Actinobacteria and Proteobacteria. At genus level, the highest abundance was unidentified. Bacterial diversity and species abundance in three sample plots were higher than those before planting Pennisetum sp. The soil bacterial diversity and species abundance of farmland were highest in jointing stage, the amount of bacteria was highest in tillering stage. The soil bacterial diversity and species abundance of hilltop were highest in tillering stage. The soil bacterial diversity of flood and was highest in seedling stage, the species abundance was highest in jointing stage. [Conclusion] The soil bacterial community structure in Pisha sandstone was similar in different growth stage of Pennisetum sp. Pennisetum sp. can obviously promote soil bacterial diversity and species abundance and improve soil organic matter content effectively. However, the soil bacterial diversity, amounts and organic matter content reached a maximum in different growth stage.