Arbuscular mycorrhizal fungi reduce cadmium leaching from polluted soils under simulated heavy rainfall
Arbuscular mycorrhizal fungi reduce cadmium leaching from polluted soils under simulated heavy rainfall
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丛枝菌根真菌减少模拟强降雨下污染土壤中镉的淋溶
DOI：
10.1016/j.envpol.2020.114406
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发表时间：
2020-08-01
影响因子：
8.9
通讯作者：
Li, Yuan
中科院分区：
文献类型：
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作者：
He, Yong-mei;Yang, Rui;Li, Yuan
以云南省某铅锌矿周边的荒地、农田和坡地为研究对象，研究了土壤中镉的污染状况。在双室培养系统中用丛枝菌根真菌（AMF）接种玉米植物（宿主），所述双室培养系统包括作为AMF接种处理的一部分的菌根和菌丝室以及作为非接种处理的一部分的根和土壤室。研究了AM真菌对玉米生物量、Cd吸收量、土壤团聚体组成、0-20和20 ~ 40 cm土壤间流Cd浓度以及Cd淋溶的影响。结果表明，AMF能显著提高玉米生物量和Cd吸收量。结果表明，与土壤隔室相比，菌根隔室和菌丝隔室的土壤总球囊霉素相关蛋白（T-GRSP）和>2.0 mm团聚体含量较高，Cd含量较低，溶解态Cd淋溶量较低。双向方差分析表明，AMF显著增加了T-GRSP和>2.0 mm团聚体的含量，降低了壤中流Cd浓度和溶解态Cd淋溶量。此外，AMF与根系广泛的相互作用，影响土壤团聚体组成和Cd含量的interflow。在降雨量为40 mm/h时，T-GRSP和>2.0 mm团聚体含量与壤中流Cd浓度和淋溶Cd浓度均呈显著负相关。此外，镉的浓度在壤中流的溶解态镉淋溶量呈显著正相关。因此，AMF还原的Cd浓度和Cd污染土壤中Cd的淋溶与土壤中T-GRSP含量和大团聚体比例的增加密切相关。(C)2020爱思唯尔有限公司版权所有。
Cadmium (Cd)-polluted soils were collected from wasteland, farmland, and slopeland surrounding a lead ezinc 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 Cdpolluted soils were closely related to increased T-GRSP contents and macroaggregate proportion in the soils. (C) 2020 Elsevier Ltd. All rights reserved.