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Effects of Biogas Slurry Application Years on Remediation of Pennisetum x sinese on Soil Physical and Chemical Properties and Microorganisms of Rare Earth Tailings
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Effects of Biogas Slurry Application Years on Remediation of Pennisetum x sinese on Soil Physical and Chemical Properties and Microorganisms of Rare Earth Tailings
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Effects of Biogas Slurry Application Years on Remediation of Pennisetum x sinese on Soil Physical and Chemical Properties and Microorganisms of Rare Earth Tailings
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Journal Article
Effects of Biogas Slurry Application Years on Remediation of Pennisetum x sinese on Soil Physical and Chemical Properties and Microorganisms of Rare Earth Tailings
2024
Overview
[Objectives] This study was conducted to analyze the effects of continuous application of biogas slurry for many years on soil ecosystem restoration of rare earth tailings by planting Pennisetum × sinese, in order to provide basis for scientific application of biogas slurry. [Methods] The fields with different years of continuous application of biogas slurry in Dingnan Rare Earth Tailings Ecological Restoration Demonstration Park were selected as the research object, and the differences in soil physical and chemical properties and microbial community structure after application of biogas slurry for different years (0, 3 and 5 years) were studied. [Results] The bulk density of soil with continuous application of biogas slurry showed a downward trend, while the maximum water holding capacity, capillary water holding capacity, porosity, aeration, pH, organic matter, nitrogen, phosphorus and potassium, alkali-hydrolyzable nitrogen and available phosphorus showed an upward trend. Moreover, the effects achieved by application for 5 years were better than those by application for 3 years. Continuous application of biogas slurry could significantly improve the activity of soil urease, acid phosphatase, sucrase and cellulase, and it effects increased with the application year increasing. Continuous application of biogas slurry could significantly improve the abundance of dominant bacteria in soil, and with the increase of application years, the abundances of dominant bacteria also increased. [Conclusions] Continuous application of biogas slurry effectively improved soil physical and chemical properties and soil fertility in rare earth tailings areas where Pennisetum x sinese was planted to restore rare earth tailings. This study provides a theoretical support for establishing key ecological restoration technoiques.
