College of Resources and Environment, Yunnan Agricultural University, Kunming, Yunnan, China.
College of Water Conservancy, Yunnan Agricultural University, Kunming, Yunnan, China.
Environ Pollut. 2020 Aug;263(Pt B):114406. doi: 10.1016/j.envpol.2020.114406. Epub 2020 Mar 18.
Cadmium (Cd)-polluted soils were collected from wasteland, farmland, and slopeland surrounding a lead-zinc mine in Yunnan Province, Southwest China. Maize plants (the host) were inoculated with arbuscular mycorrhizal fungi (AMF) in a dual-compartment cultivation system that included mycorrhizal and hyphal compartments as part of an AMF inoculation treatment and root and soil compartments as part of a the non-inoculation treatment. The effects of AMF on maize biomass and Cd uptake, soil aggregate composition, and Cd concentration in the interflow within two soil layers (0-20 and 20-40 cm) as well as the Cd leaching from these three Cd-polluted soils under simulated heavy rainfall (40 and 80 mm/h) were investigated. The results demonstrated that AMF led to increased maize biomass and Cd uptake. There were greater contents of total glomalin-related soil protein (T-GRSP) and >2.0 mm aggregates and lower Cd concentrations in the interflow and lower dissolved Cd leaching in the mycorrhizal and hyphal compartments than in the soil compartment. A two-way analysis of variance revealed that AMF significantly increased the contents of T-GRSP and >2.0 mm aggregates and reduced both Cd concentrations in the interflow and dissolved Cd leaching. Moreover, AMF interacted extensively with the roots and affected soil aggregate composition and Cd concentrations in the interflow. Under 40 mm/h of rainfall, the contents of T-GRSP and >2.0 mm aggregates were significantly negatively correlated with both Cd concentrations in the interflow and dissolved Cd leaching. In addition, the Cd concentrations in the interflow were significantly positively correlated with the amount of dissolved Cd leaching. Therefore, both AMF-reduced Cd concentrations in the interflow and Cd leaching from Cd-polluted soils were closely related to increased T-GRSP contents and macroaggregate proportion in the soils.
从中国西南部云南省的一个铅锌矿周围的荒地、农田和坡地采集了镉（Cd）污染土壤。在一个双室培养系统中，将玉米植株（宿主）接种丛枝菌根真菌（AMF），该系统包括菌根和菌丝室作为 AMF 接种处理的一部分，以及根和土壤室作为非接种处理的一部分。研究了 AMF 对玉米生物量和 Cd 吸收、土壤团聚体组成以及两个土壤层（0-20 和 20-40cm）内的壤间流中 Cd 浓度以及这三种 Cd 污染土壤在模拟强降雨（40 和 80mm/h）下 Cd 浸出的影响。结果表明，AMF 导致玉米生物量和 Cd 吸收增加。菌根和菌丝室内的总球囊霉素相关土壤蛋白（T-GRSP）和>2.0mm 团聚体含量较高，壤间流中的 Cd 浓度较低，土壤室内的溶解 Cd 浸出量较低。双向方差分析表明，AMF 显著增加了 T-GRSP 和>2.0mm 团聚体的含量，并降低了壤间流中的 Cd 浓度和溶解 Cd 浸出量。此外，AMF 与根系广泛相互作用，影响土壤团聚体组成和壤间流中的 Cd 浓度。在 40mm/h 的降雨下，T-GRSP 和>2.0mm 团聚体的含量与壤间流中的 Cd 浓度和溶解 Cd 浸出量呈显著负相关。此外，壤间流中的 Cd 浓度与溶解 Cd 浸出量呈显著正相关。因此，AMF 降低了壤间流中的 Cd 浓度和 Cd 污染土壤的浸出量，这与土壤中 T-GRSP 含量的增加和大团聚体比例的增加密切相关。
