Effects of dominant plant growth on the nutrient composition and bacterial community structure of manganese residues
Creators: name: Luo, Yang
name: Liu, Fang
name: Ren, Jun
name: Zhu, Jian
name: Luo, Xuqiang
name: Xiang, Yangzhou
Publisher: name: Taylor & Francis
Year: 2021
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Environmental Sciences not elsewhere classified
subject: Chemical Sciences not elsewhere classified
subject: Ecology
subject: Biological Sciences not elsewhere classified
subject: Plant Biology

description: The rhizospheres of three dominant plant species (<i>Miscanthus floridulus, Buddleja lindleyana</i>, and <i>Erigeron annuus</i>) growing in manganese residue disposal sites in eastern Guizhou Province, China, were analyzed to study the effects of plant growth on the nutrient levels and bacterial community structure of two types of manganese residues. The results showed that the growth of the three species improved the nutritional composition of manganese residues; the available nitrogen (AN) contents of the manganese mine residue significantly increased by 29.56–60.78% while the available phosphorus (AP) contents of the electrolytic manganese residue significantly increased by 30.24–44.41% compared to those in unvegetated manganese residue. The diversity of the bacterial community in the manganese mine residue increased significantly due to plant growth. <i>Proteobacteria</i>, <i>Acidobacteria</i>, and <i>Bacteroidetes</i> were the dominant phyla in both manganese residues. <i>Sphingomonas</i> and GP6 were the dominant bacterial genera. The relative abundance of the <i>Firmicutes</i> phylum was significantly higher in the manganese mine residue than in the control and that of the <i>Thiobacillus</i> genus was lower, which indicated improvements in the microenvironment. Correlation analysis showed that OM and AN were the main nutrient factors affecting the bacterial community structure in the manganese mine residue. <b>Novelty statement</b> At present, research on the phytoremediation of manganese residue disposal sites focuses mostly on the investigation of different plant types and their heavy metal accumulation and transformation characteristics. However, comparative studies of the differences in growth matrix characteristics between plant growth areas and exposed areas are lacking. In addition, dominant plant species are regionally distributed. The previous studies were mostly concentrated in Chongqing, Guangxi, and Hunan in China. The eastern region of Guizhou Province is located in the “Manganese Triangle” area of China, where the manganese resources account for about 50% of the national total. There is no report on the phytoremediation of manganese residue disposal sites in this region. Therefore, the rhizospheres of three dominant plant species (<i>Miscanthus floridulus</i>, <i>Buddleja lindleyana</i>, and <i>Erigeron annuus</i>) growing in manganese residue disposal sites in eastern Guizhou Province, China, were analyzed to study the effects of plant growth on the nutrient levels and bacterial community structure of two types of manganese residues (manganese mine residue and electrolytic manganese residue). This study could provide useful theoretical information to benefit the ecological restoration of manganese residue disposal sites.