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• Effects of Combined Application of Sugar Mill Sludge and Biochar on Basic Properties and Organic Carbon Components of Black Soil in Northeast China ZHAO Jia, HU Xiaohang, LI Yanli Chinese Agricultural Science Bulletin    2024, 40 (26): 38-45.   DOI: 10.11924/j.issn.1000-6850.casb2024-0231 Abstract   （78） HTML （1） PDF（pc） （1648KB）（101）   The study investigated the effects of combined application of beet and sugar plant waste sludge and biochar on the fundamental properties and organic carbon components of farmland soil in Northeast China black soil region. Eight treatments were set up for comparison: no material returned to the field (CK1), 20000 kg/hm2 biochar without filter mud (CK2), 16.67 kg/hm2 filter mud without biochar (T1), 16.67 kg/hm2 filter mud with 20000 kg/hm2 biochar (T2), 33.33 kg/hm2 filter mud without biochar (T3), 33.33 kg/hm2 filter mud with 20000 kg/hm2 biochar (T4), 50 kg/hm2 filter mud without biochar (T5), and 50 kg/hm2 filter mud with 20000 kg/hm2 biochar (T6). Soil total carbon, total organic carbon, easily oxidized organic carbon, water-soluble organic carbon, particulate organic carbon, environmental factors such as alkali-hydrolyzed nitrogen, available phosphorus and available potassium, as well as soil biological activities including urease, phosphatase and sucrase were analyzed to discuss the effects of each treatment on organic carbon components and carbon pool management index. The results indicated that the combined application of filter sludge and biochar significantly increased soil total organic carbon content, easily oxidized organic carbon content and carbon pool management index. The application also affected active carbon components by enhancing available nutrients and enzyme activities which led to an increase in the soil's overall stability. In conclusion, it was found that T4 treatment, a combination of 33.33 kg/hm2 filter sludge with 20000 kg/hm2 biochar, yielded the most favorable results in terms of achieving soil carbon sequestration, increasing CPMI content, and improving the stability of soil organic carbons. 时期 处理 CPI A AI CPMI 块根积累期 CK1 1.00±0.09a 0.32±0.04ab 1.00±0.13ab 99.30±5.13b CK2 1.06±0.08a 0.18±0.04c 0.57±0.13c 59.73±9.04cd T1 1.03±0.07a 0.31±0.05ab 0.98±0.15ab 100.28±13.46b T2 1.20±0.20a 0.25±0.05bc 0.77±0.17bc 90.35±11.11b T3 1.03±0.06a 0.16±0.02c 0.51±0.05c 52.65±5.01d T4 1.22±0.26a 0.37±0.10a 1.15±0.33a 133.70±13.56a T5 1.05±0.03a 0.24±0.05bc 0.76±0.17bc 79.66±16.19bc T6 1.12±0.10a 0.37±0.10a 1.16±0.32a 127.31±22.99a 收获期 CK1 1.00±0.05a 0.14±0.00b 1.00±0.02b 99.95±4.23b CK2 1.01±0.06a 0.13±0.02b 0.91±0.15b 92.15±10.51b T1 1.00±0.04a 0.22±0.02a 1.54±0.11a 154.06±15.94a T2 1.00±0.05a 0.21±0.03a 1.44±0.22a 143.09±14.03a T3 0.97±0.02a 0.14±0.02b 0.96±0.11b 93.23±10.41b T4 0.99±0.01a 0.20±0.06a 1.37±0.41a 135.14±41.76a T5 1.01±0.05a 0.13±0.01b 0.94±0.05b 95.30±9.32b T6 1.00±0.06a 0.22±0.03a 1.52±0.22a 151.53±14.18a 表4 施用滤泥生物炭对土壤碳库管理指数的影响 Other Images/Table from this Article 表1 试验小区土壤基本理化性质 mg/kg 表2 试验处理 表3 施用滤泥生物炭对土壤理化性质和土壤生物活性的影响 图1 图a~e分别为不同还田处理对土壤总碳、总有机碳、水溶性有机碳、颗粒有机碳、易氧化有机碳的影响 * p<=0.05 ** p<=0.01