| Effects of combined application of biochar and biogas slurry on percolate electrical conductivity, total nitrogen and soil physical and chemical properties |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn81000-7601.2020.03.18 |
| Key Words: biogas slurry biochar matching application electrical conductivity total nitrogen leaching physical and chemical properties of soil |
| Author Name | Affiliation | | ZHENG Jian | College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
Western China Energy & Environment Research Center, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
China Northwestern Collaborative Innovation Center of Low-Carbon Urbanization Technologies, Lanzhou, Gansu 730050, China | | LI Xinyi | College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
Western China Energy & Environment Research Center, Lanzhou University of Technology, Lanzhou, Gansu 730050, China | | MA Jing | College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
Western China Energy & Environment Research Center, Lanzhou University of Technology, Lanzhou, Gansu 730050, China | | XIANG Peng | College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China
Western China Energy & Environment Research Center, Lanzhou University of Technology, Lanzhou, Gansu 730050, China | | WANG Jian | Water Conservancy and Architectural Engineering, Northwest Agriculture and Forestry University, Yangling, Shaanxi 712100, China |
|
| Hits: 909 |
| Download times: 842 |
| Abstract: |
| In order to increase the retention of nutrients in the soil and improve the utilization efficiency of biogas slurry, an indoor soil\|column experiment was carried out. Different biogas slurry ratios (1∶4, 1∶6, and 1∶8 of biogas slurry∶water, volume ratio), biochar mixing rates (0.0%, 0.5%, 1.0%, and 2.0% of soil mass fraction), and biochar mixing thickness (5, 10, 15 cm, and 20 cm) were set up to study the effect of biochar combined with biogas slurry on soil column exudate. Soil physical and chemical properties including electrical conductivity, total nitrogen (N), bulk density, water stability aggregates, total porosity, pH value, and organic matter were studied. The results showed that when biogas slurry ratio was at 1∶8, biochar combined with biogas slurry had no significant effect on total N leaching. When biogas slurry ratio was at 1∶6, the leaching range of total N in exudate was 34.49%~66.79%. When biogas slurry ratio was at 1∶4, the leaching range of total N in exudate was 4.17%~71.67%, that indicated that biochar combined with biogas slurry effectively improved the total N content in soil. With increasing biochar ratio, the soil had more water stable aggregate > 0.25 mm, higher soil total porosity and soil organic matter with a range of CK < 0.5% < 1.0% < 2.0%. With decreasing biogas slurry ratio in an order of 1∶4>1∶6>1∶8, soil water stable aggregate >0.25 mm increased by 8.47%~31.99%, soil total porosity increased by 0.76%~3.72%, and soil organic matter increased by 4.83%~37.17%. Soil bulk density increased with increasing the proportion of biochar and biogas slurry in the soil with a decreasing range of 2.22%~8.15%, which showed that biochar with biogas slurry improved the physical and chemical properties of the soil. |
|
|
|