Although selenium (Se) is an essential microelement for humans and animals, it is a potentially toxic element due to its bioaccumulation potential. In this study, Se fertilizer was supplied in a greenhouse vegetable (cucumber) plantation using an innovative system consisting of nanobubbles (NB_Se) and compared to that under conventional conditions of fertigation (C_Se) with six doses. The results revealed that

NB_Se significantly reduced soil Se accumulation (38%−144%) and increased cucumber Se content compared with the C_Se treatments at the same Se dose. NB_Se significantly lowered the soil bacterial diversity, with an initial increase and then decrease with the Se doses. Bacterial associations and potential keystone taxa also differed between the NB_Se and C_Se. The greater abundance of oxidizing bacteria (indicated by the function composition of bacterial community) and the improved soil redox environment created by NBs sustained more available Se for plants, leading to a reduction in soil Se residual and an increase in the plant Se content. Our results highlight the feasibility and efficiency of NB_Se and demonstrate the important implications of Se for the maintenance of soil health and sustainability.

尽管硒 (Se) 是人类和动物必需的微量元素，但由于其生物累积潜力，它是一种潜在的有毒元素。在这项研究中，使用由纳米气泡 (NB_Se) 组成的创新系统在温室蔬菜（黄瓜）种植园中提供硒肥，并与常规施肥条件下的硒肥（C_Se）进行比较，共 6 剂。结果表明，

与相同硒剂量的 C_Se 处理相比，NB_Se 显着降低了土壤硒积累（38%-144%）并增加了黄瓜硒含量。NB_Se 显着降低土壤细菌多样性，随着硒剂量的增加先增加后减少。NB_Se 和 C_Se 之间的细菌关联和潜在的关键类群也不同。更多的氧化细菌（由细菌群落的功能组成表明）和由NBs创造的改善的土壤氧化还原环境维持了植物更多的可用硒，导致土壤硒残留减少和植物硒含量增加。我们的结果突出了 NB_Se 的可行性和效率，并证明了 Se 对维持土壤健康和可持续性的重要意义。