The characterization of DOM and its effect on heavy metal solubility in soils have been widely concerned, while few concerns on the phytostabilization of multi-metal contaminated soils. A pot experiment was performed to characterize dissolved organic matter (DOM) in the rhizosphere of the mining ecotype (ME) and non-mining ecotype (NME) of Athyrium wardii (Hook.) when exposed to Cd and Pb simultaneously, and investigate its effect on Cd and Pb solubility in soils. The ME presented more DOM in the rhizosphere when exposed to Cd and Pb simultaneously than that exposed to single Cd or Pb, and also than the NME. The acid fractions (hydrophilic acid, hydrophobic acid) and hydrophilic fractions (hydrophilic acid, hydrophilic neutral, and hydrophilic base) were the dominant parts of DOM in the ME rhizosphere. The ME presented more acid and hydrophilic fractions in the rhizosphere when exposed to Cd and Pb simultaneously. Meanwhile, there were more O–H, C–O, N–H and C–H, assigned to carboxylic groups, phenolic groups, hydroxyl groups, and/or amino groups, present in DOM from the rhizosphere of ME when exposed to Cd and Pb simultaneously. These results highlighted the acid characteristics of DOM in the rhizosphere of ME when exposed to Cd and Pb simultaneously. DOM in the rhizosphere of ME thereby showed greater complexation degree for Cd (68%) and Pb (77%), thus showing greater ability to enhance Cd and Pb solubility in soils when exposed to Cd and Pb simultaneously. This is thereby considered to be one of the key processes for enhancing Cd and Pb uptake by the ME when exposed to Cd and Pb simultaneously.

DOM的表征及其对土壤中重金属溶解度的影响已广受关注，而对多金属污染土壤的植物稳定性却鲜有关注。进行了盆栽试验中的采矿生态型（ME）和非采矿生态型（NME）的根际以表征溶解有机物质（DOM）蹄wardii（Hook。）同时暴露于Cd和Pb时，研究其对Cd和Pb在土壤中溶解度的影响。当同时暴露于Cd和Pb时，ME在根际中呈现出更多的DOM，而不是单一Cd或Pb以及NME。酸级分（亲水性酸，疏水性酸）和亲水性级分（亲水性酸，亲水性中性和亲水性碱）是ME根际中DOM的主要部分。当同时暴露于Cd和Pb时，ME在根际中表现出更多的酸和亲水部分。同时，当暴露于Cd时，来自ME根际的DOM中存在更多的O，H，C–O，N–H和C–H，它们分别属于羧基，酚基，羟基和/或氨基。和铅同时出现。这些结果突出了当同时暴露于Cd和Pb时，ME根际中DOM的酸性特征。因此，ME根际中的DOM对Cd（68％）和Pb（77％）表现出更高的络合度，因此当同时暴露于Cd和Pb时显示出更高的增强Cd和Pb在土壤中溶解度的能力。因此，当同时暴露于Cd和Pb时，这被认为是提高ME对Cd和Pb吸收的关键过程之一。