Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 649, Issue -, Pages 1250-1259Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2018.08.242
Keywords
Karst rocky desertification; Soil microbial community; Bacterial network; Soil microbiome
Categories
Funding
- Scientific and technological cooperation Project of Guizhou province [LH20167208]
- Program for Changjiang Scholars and Innovative Research Team in University of China [IRT1227]
- Science and Technology Platform Construction Project of Guizhou province [Z20114005]
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Karst rocky desertification is a severe irreversible ecosystem failure. The karst ecosystem is so fragile that it is vulnerable to environmental changes, degrading into rocky desertification. Prior studies revealed the potential connections between the soil bacterial community, the edaphic properties and the aboveground vegetation cover in the karst ecosystem. However, how these three elements affect each other and work together in propelling in the karst rocky desertification progress largely remains unexplored. To answer this question, we monitored the bacterial community variations in soils sampled from multiple sites at a successional karst rocky desertification region by sequencing the 16S rRNA V3-V4 regions. Overall, we detected 34 bacterial phyla in the karst soils, of which Proteobacteria, Actinobacteria, and Acidobacteria are the most abundant. Network analysis of the bacterial community- vegetation-edaphic property-vegetation interactions identified 6 bacterial herds that had significant correlation with soil Ca2+ and available phosphorus change during vegetation degradation. Further functional simulation of these bacterial herds unveiled the change of Ca2+ and available phosphorus might disturb the soil carbon and nitrogen metabolism, and thus weakened soil quality. In summary, we hypothesized a calcium-driven bacterial response mechanism in the karst rocky desertification progress. (C) 2018 Published by Elsevier B.V.
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