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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 碱解氮/(mg/kg) 有效磷/(mg/kg) 速效钾/(mg/kg) 脲酶/[mg/(24h·g)] 蔗糖酶/[mg/(24h·g)] 磷酸酶/[mg/(24h·g)] 块根积累期 CK1 98.00±22.95a 64.75±4.51cd 215.35±33.89a 36.35±6.76b 22.46±0.72bc 41.11±4.64b CK2 99.17±14.57a 61.83±3.93d 245.46±26.87a 49.74±7.71ab 24.36±0.76a 56.73±7.82a T1 95.67±21.39a 64.91±1.12cd 215.79±21.12a 56.32±10.39ab 22.07±0.72bc 42.45±3.25b T2 96.83±2.02a 71.62±6.91bc 203.94±22.19a 43.91±9.52ab 22.95±0.77ab 45.87±5.78b T3 88.67±4.04a 76.86±6.07ab 215.14±34.04a 75.43±26.16a 21.18±0.08c 41.89±3.64b T4 81.67±7.29a 84.72±8.43a 207.44±10.97a 63.66±18.98ab 24.29±0.80a 57.77±5.27a T5 94.50±10.50a 81.23±6.46a 219.83±18.34a 62.19±21.13ab 21.34±1.32c 40.19±2.91b T6 89.83±7.29a 83.68±1.54a 204.24±21.93a 54.58±14.78ab 24.02±0.46a 55.90±6.92a 收获期 CK1 102.67±12.29a 64.71±5.79ab 273.40±78.49a 35.97±1.73bc 22.23±0.48a 49.59±2.63a CK2 115.50±26.42a 59.49±6.67b 242.97±87.64a 37.75±5.39bc 22.07±2.91a 49.38±10.70a T1 100.33±14.57a 68.74±12.66ab 224.19±1.43a 29.53±3.44c 21.90±2.44a 50.84±5.20a T2 115.50±19.49a 64.82±3.35ab 243.49±70.77a 41.68±4.56abc 22.72±1.12a 48.16±8.96a T3 84.00±10.50a 74.08±6.62ab 211.91±19.29a 44.78±6.16ab 22.32±1.14a 43.14±5.07a T4 114.33±37.42a 76.21±5.66a 282.95±92.16a 55.07±10.95a 24.14±1.09a 43.91±5.06a T5 92.17±4.04a 76.92±2.75a 198.35±18.91a 55.30±3.44a 26.38±8.34a 43.64±5.60a T6 96.83±10.10a 67.20±13.15ab 279.89±117.83a 48.00±15.62ab 24.38±1.13a 44.95±6.95a 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 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 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 表4 施用滤泥生物炭对土壤碳库管理指数的影响 * p<=0.05 ** p<=0.01