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| DOI：10.13522/j.cnki.ggps.2023171 |
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| Effects of Biogas Slurry Application on Soil: A Review |
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PENG Xianjin, XIA Jing, SHI Jingtao, YING Xiaocheng, SUN Wenyuan, HUANG Xiaomin, SHEN Xinping
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1. Yangzhou University, Yangzhou 225009, China; 2. Yangzhou University (Changshu) Modern Agricultural Development Research Institute Co, Suzhou 215000, China; 3. Changshu Water Conservancy Technology Extension Station, Suzhou 215000, China
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| Abstract: |
| 【Objective】Biogas liquid application as fertilizer is an important way of using biogas as a resource, and is a key part of building a highly efficient biogas liquid production and utilization cycle.【Method】Therefore, clarifying the impact of biogas liquid application on the soil can provide a scientific basis for the rational and safe use of biogas liquid resources.【Result】To this end,six representative soil quality indicators, namely soil bulk, soil nutrients, soil pH, soil enzyme activity, soil microorganisms and soil heavy metals, are selected to review the effects of biogas liquid return to the field on soil quality. Overall, on the basis of a clear definition of the optimum amount of biogas liquid to be applied, the reasonable application of biogas liquid is conducive to a reasonable reduction in soil capacity, enhancement of soil nutrient accumulation capacity, improvement of soil pH values and enhancement of soil enzyme activity. However, long-term application of biogas liquid may lead to a shift in soil microbial type from “bacterial” to “fungal” and pose a certain risk of heavy metal pollution.【Conclusion】In addition, it was pointed out that the current research difficulties are mainly in the heterogeneity of biogas liquid and the lack of unified soil evaluation methods, and that exploring the optimal amount of biogas liquid application, clarifying the maximum soil biogas liquid carrying capacity, studying the mechanism of biogas liquid affecting soil quality, and establishing a unified soil quality evaluation method are the future research priorities. |
| Key words: biogas liquid; soil quality; soil nutrient; carrying capacity |
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