Effects of Land Reclamation on Soil Bacterial Community and Potential Functions in Bauxite Mining Area

Abstract

Studying the characteristics of microorganisms in mine reclamation sites can provide a scientific reference basis for mine land reclamation. Soils in the plough layer (0–20 cm) of the bauxite mine plots in Pingguo city, Guangxi Zhuang Autonomous Region, China, with different reclamation years were used as the research objects. The community structure of soil bacteria was analyzed with high-throughput sequencing technology. The results show the following: (1) Reclamation significantly increased the contents of soil nutrients (p < 0.05). (2) The relative abundances of Proteobacteria were high (22.90~41.56%) in all plots, and reclamation significantly reduced the relative abundances of Firmicutes (3.42–10.77%) compared to that in the control plot (24.74%) (p < 0.05). The relative abundances of α-proteobacteria generally increased while the reclamation year increased. The relative abundances of α-proteobacteria and γ-proteobacteria showed significant positive correlations with soil carbon, nitrogen, and phosphorus nutrients (p < 0.01). The relative abundance of Acidobacteria Group 6 showed significant positive correlations with soil exchangeable Ca and Mg (p < 0.01). (3) Bacterial co-occurrence network showed more Copresence interactions in all plots (50.81–58.39%). The reclaimed plots had more nodes, higher modularity, and longer characteristic path length than the control plot, and the keystone taxa changed in different plots. (4) The chemoheterotrophy and aerobic chemoheterotrophy were the most abundant functional groups in all plots (35.66–48.26%), while reclamation reduced the relative abundance of fermentation groups (1.75–11.21%). The above findings indicated that reclamation improved soil nutrients, changed the bacterial community structure and potential functions, and accelerated the microbial stabilization of the reclaimed soil.

Microbial Communities and Soil Respiration during Rice Growth in Paddy Fields from Karst and Non-Karst Areas

“…Soil physicochemical properties were analyzed by routine methods [33]. Briefly, soil moisture content was measured using the drying method.…”

The Allocation Change of Rural Land Consolidation Type Structure under the Influence Factors of Different Geographical and Economic Development of China

“…Since 1999, various types of land consolidation in China have different functions: Land arrangement is an activity that adjusts the land’s form, land ownership, and land-use structure, improves and builds infrastructure facilities to increase land-use efficiency and productivity, and improves production, living, ecological conditions and functions, including agricultural land consolidation and construction land consolidation [ 9 , 10 , 11 ]. Land development is the process of making unused land available through engineering, biological, or comprehensive measures, including agricultural land development and construction land development [ 12 ]. Land reclamation is an activity that makes land destroyed due to production and construction activities and natural disasters available by taking comprehensive control measures (land consolidation terminology issued by the Ministry of land and resources in March 2018 (TD/T 1054-2018)).…”