Biochar is porous and rich in functional groups on its surface. When applied to Cd-contaminated soils, it can reduce Cd availability and decrease Cd uptake by crops. However, the combined effect of biochar application with vegetables on soil biogeochemistry is often neglected. In the pot experiment of this study, biochar (B) derived from straws of Pennisetum hydridum was applied (2% by weight) to a Cd-contaminated soil planted with two cultivars of Chinese flowering cabbage (Brassica parachinensis L.): Bilvcutai (C+B) and Teqingchixin#4 (T+B). The results showed that in C+B and T+B, soil textures were loam, while CK, C, T were silty loam, and B was sandy loam; soil moisture increased by 19 % and 12 %, respectively; soil pH increased significantly by 0.29 and 0.30 units, respectively; soil organic matter increased by 28 % and 11 %, respectively; soil cation exchange capacity increased by 40 % and 29 %, respectively; Urease, neutral phosphatase, and sucrose activities did not change significantly in C+B, but urease activity increased significantly while phosphatase activity decreased sign ificantly in T+B; Bacterial abundance increased 3.7- and 3.4-fold, and fungal abundance increased 1.2- and 1.7-fold, while actinomycete abundance increased 2.4- and 1.6-fold in C+B and T+B, respectively; soil available nitrogen increased by 38 % and 58 %, respectively; soil available phosphorus increased by 55 % and 66 %, respectively; while soil available Cd was decreased by 30 % and 25 %, respectively. In addition, biochar application improved vegetable gowth, and the plant Cd content in the roots decreased by approximately 18 % and 14 % in C+B and T+B, respectively, and that in the aboveground parts decreased by approximately 10 % in C+B and T+B. Thus, biochar application improved soil fertility and quality while reducing Cd bioavailability and uptake by Chinese flowering cabbage.

生物炭是多孔的，其表面富含官能团。当应用于受镉污染的土壤时，它会降低镉的有效性并减少作物对镉的吸收。然而，生物炭与蔬菜施用对土壤生物地球化学的综合影响往往被忽视。在本研究的盆栽试验中，将源自Pennisetum hydridum秸秆的生物炭 (B) （按重量计 2%）施用到种植有两种大白菜 ( Brassica parachinensis)品种的 Cd 污染土壤中。L.): Bilvcutai (C+B) 和 Teqingchixin#4 (T+B)。结果表明，C+B和T+B土壤质地为壤土，CK、C、T为粉质壤土，B为砂壤土；土壤水分分别增加了 19% 和 12%；土壤pH值分别显着增加0.29和0.30个单位；土壤有机质分别增加了 28% 和 11%；土壤阳离子交换能力分别提高了40%和29%；尿素酶、中性磷酸酶和蔗糖活性在C+B中没有显着变化，但在T+B中脲酶活性显着增加而磷酸酶活性显着降低；在 C+B 和 T+B 中，细菌丰度增加了 3.7 倍和 3.4 倍，真菌丰度增加了 1.2 倍和 1.7 倍，而放线菌丰度分别增加了 2.4 和 1.6 倍；土壤有效氮增加了 38% 和 58%，分别; 土壤有效磷分别增加了55%和66%；而土壤有效镉分别降低了 30% 和 25%。此外，生物炭的施用改善了蔬菜的生长，C+B和T+B中植物根部Cd含量分别降低了约18%和14%，C+中地上部分Cd含量降低了约10% B 和 T+B。因此，生物炭的施用提高了土壤肥力和质量，同时降低了大白菜对 Cd 的生物有效性和吸收。C+B 和 T+B 的地上部分下降约 10%。因此，生物炭的施用提高了土壤肥力和质量，同时降低了大白菜对 Cd 的生物有效性和吸收。C+B 和 T+B 的地上部分下降约 10%。因此，生物炭的施用提高了土壤肥力和质量，同时降低了大白菜对 Cd 的生物有效性和吸收。