[目的] 分析施加生物炭配合深松对农田耕层土壤容重、土壤结构稳定性及有机碳的影响，为土壤结构改良提供科学合理的调控措施和理论依据。[方法] 基于冬小麦—夏玉米轮作体系，2017—2019年大田试验期间，在小麦季设置生物炭施用量分别为0，3 000，6 000 kg/hm2(B0，B1和B2)的3个处理，在玉米季设置传统贴茬播种(P)和深松耕作播种(S)2个耕作处理，共计B0P，B1P，B2P，B0S，B1S，B2S 6个处理。[结果] ①两个轮作后，相同耕作方式下，土壤容重随生物炭用量的增加而降低，其中B2S较B0S显著降低(13.59%)；同一施炭水平下，各处理土壤容重呈现出深松＜传统的特征，深松容重整体较传统低4.95%。②连续施加生物炭配合深松耕作两年后，B2S处理下的有机碳含量达到最高，比B0P显著增加(42.15%)，比B2P增加1.03%。③两个轮作后，随生物炭用量的增加机械性团聚体含量(DR0.25)、水稳性团聚体含量(WR0.25)、平均重量直径(MWD)呈上升趋势，相反土壤团聚体破坏率(PAD)及土壤不稳定团粒指数(ELT)呈逐渐下降趋势，且表现为B2S处理均优于其他各处理的特征，表明高添加量生物炭配合深松耕作较传统耕作能更有效地提高团聚体稳定性。[结论] 小麦季基施6 000 kg/hm2生物炭并配合玉米季深松有利于提高土壤团聚体稳定性，改善华北平原农田土壤结构。
[Objective] The effects of applying biochar combined with subsoiling on soil bulk density, soil structure stability, and organic carbon in farmland topsoil were comprehensively analyzed to provide scientific and reasonable control measures and a theoretical basis for soil structure improvement. [Methods] A field experiment was conducted from 2017 to 2019 based on a winter wheat and summer corn rotation system. Biochar was applied at rates of 0, 3 000, and 6 000 kg/hm2 (B0, B1, and B2) during the wheat season in conjunction with two tillage treatments 〔traditional stubble sowing (P) and subsoiling tillage sowing (S)〕 imposed during the corn season to produce a total of six combined treatments of B0P, B1P, B2P, B0S, B1S, and B2S. [Results] ① After two crop rotations, under the same tillage method, soil bulk density decreased with increasing biochar application rate, and bulk density under B2S was significantly lower than under B0S by 13.59%. Under the same biochar application level, soil bulk density under subsoiling was less than under traditional stubble sowing, and the subsoiling bulk density was 4.95% lower than the bulk density under traditional stubble sowing; ② After two years of continuous application of biochar combined with subsoiling tillage, the organic carbon content of B2S was the highest, and was 42.15% greater than observed for B0P and 1.03% greater than observed for B2P; ③ After two crop rotations, the mechanical aggregate content (DR0.25), the water-stable aggregate content (WR0.25), and the mean weight diameter (MWD) showed an upward trend with increasing biochar application rate. In contrast, soil aggregate destruction rate (PAD) and soil unstable aggregate index (ELT) showed a decreasing trend, and B2S produced better results than the other treatments, indicating that high biochar application rates combined with subsoiling tillage more effectively improved aggregate stability than traditional tillage. [Conclusion] A basic application of 6 000 kg/hm2 of biochar during the wheat season combined with corn season subsoiling could improve the stability of soil aggregates and the soil structure of farmland in the North China Plain.