| Effects of biochar application rates on agglomerate characteristic and organic carbon distribution in Shajiang black soil |
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| DOI：10.7606/j.issn.1000-7601.2025.04.08 |
| Key Words: biochar soil aggregate soil organic carbon easily oxidized organic carbon Shajiang black soil |
| Author Name | Affiliation | | HE Xiaomei | College of Resources and Environment, Anhui Agricultural University, Hefei, Anhui 230036, China | | JIANG Yulin | College of Resources and Environment, Anhui Agricultural University, Hefei, Anhui 230036, China | | ZHANG Luohan | College of Resources and Environment, Anhui Agricultural University, Hefei, Anhui 230036, China | | GAO Lei | College of Resources and Environment, Anhui Agricultural University, Hefei, Anhui 230036, China | | KONG Haiyan | College of Resources and Environment, Anhui Agricultural University, Hefei, Anhui 230036, China |
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| Abstract: |
| In this study, the effects of biochar application rate on soil aggregate stability and organic carbon distribution in Shajiang black soil were investigated, and the results can provide scientific support for improving the quality and soil structure of Shajiang black soil. Four treatments, CK (no biochar), B1 (1% biochar, biochar accounts for 1% of the total weight of biochar and soil, the same below), B3 (3% biochar), and B6 (6% biochar)were set up in a soil column incubation test using Shajiang black soil as the experimental material. The results showed that, compared with CK, B3 and B6 treatments significantly increased the 1~2 mm agglomerate content by 57.89% to 78.95%. B6 treatment significantly increased the >2 mm agglomerate content by 44.44%, but decreased the <0.053 mm agglomerate content. Compared to CK, B3 treatment significantly increased mean weight diameter (MWD) and geometric mean diameter (GMD) by 16.25% and 22.64%, respectively, and B6 treatment significantly increased the >0.25 mm agglomerate content (R0.25), MWD, and GMD by 6.15%, 23.75%, and 33.96%, respectively, but decreased fractal dimension (D) by 5.44%. Compared to CK, B3 and B6 treatments significantly promoted total soil organic carbon (SOC) accumulation by 66.37% and 162.85%, respectively. B1 and B3 treatments significantly increased the organic carbon contribution of the <0.053 mm aggregates by 105.45% and 74.88%, respectively, while the B6 treatment significantly increased the organic carbon contribution of 1~2 mm aggregates by 59.46%. Different biochar application rates treatments significantly increased the organic carbon content of the <0.053 mm agglomerates as B6>B3>B1 and significantly increased the easily oxidized organic carbon (EOC) content of the 0.5~1 mm and the 0.053~0.25 mm agglomerates. SOC exhibited a significant positive correlation with R0.25, GMD, and MWD, while it had a significant negative correlation with D value (P<0.05). In conclusion, the application of 3% and 6% biochar significantly promoted the formation of water\|stable macroaggregates as well as the increase of SOC and EOC content, which improved the soil structure, enhanced the soil quality, and facilitated the abatement of obstacle factors in Shajiang black soil. |
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