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| Effect of biogas slurry combined with straw biochar on soil organic matter and total nitrogen content |
| Received:November 14, 2019 |
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| KeyWord:biogas slurry;biochar;biochar mixing amount;biochar mixing thickness;soil organic matter content;soil total nitrogen content |
| Author Name | Affiliation | | ZHENG Jian | College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Western China Energy & Environment Research Center, Lanzhou University of Technology, Lanzhou 730050, China | | LI Xin-yi | College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Key Laboratory of Complementary Energy System of Biomass and Solar Energy, Gansu Province, Lanzhou 730050, China | | MA Jing | College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Key Laboratory of Complementary Energy System of Biomass and Solar Energy, Gansu Province, Lanzhou 730050, China | | MA Biao | College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Key Laboratory of Complementary Energy System of Biomass and Solar Energy, Gansu Province, Lanzhou 730050, China | | WANG Yan | College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
China Northwestern Collaborative Innovation Center of Low-carbon Urbanization Technologies, Lanzhou 730050, China | | WANG Lei | Dryland Agriculture Institute, Gansu Academy of Agriculteral Sciences, Lanzhou 730070, China |
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| Abstract: |
| To increase the retention of nutrients in soil and improve the utilization efficiency of biogas slurry, the effect of different biochar mixing amounts (BMAs), biochar mixing thicknesses (BMTs), and soil bulk densities (ρ)on soil organic matter (SOM)and total nitrogen (TN)content was studied in laboratory soil column experiments. The results showed that the infiltration rate of the soil column increased with increases in BMA and BMT when ρ remained constant. When ρ increased, the infiltration rate was lower in the soil column also increased; however, the SOM and TN content exhibited the opposite behavior. In contrast, the SOM and TN content in the soil column increased when BMA increased; the most remarkable impact was found for a BMA of 2.0%. Moreover, the SOM content rose with the increase in BMT; the biggest influence in these experiments for a BMT=20 cm. The TN content with different BMTs was related to ρ; when ρ=1.30 and 1.35 g.cm-3, the effect was most significant for BMT=10 and 15 cm, respectively. The results indicate that the effect of biochar on SOM and TN content is also dependent on the BMA, BMT, and ρ. |
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