This study assessed how the Sonchus asper L.—Zea mays intercropping influenced the plant Cd level, as well as the organic acid (low molecular mass) types and concentrations in root secretions, which was accomplished by conducting pot experiments with soil that was collected from a farmland surrounding a mining area. The results showed that the oxalic and citric acids were the prevailing organic acids in the plant root secretions, and that the intercropping led to prominently elevated root exudate concentrations of the two acids for S. asper by 43.8 and 75.4%, respectively, while decreased such concentrations by 18.5 and 18.7% for Z. mays, compared to monoculture. According to observations, the root exudate concentrations of citric and oxalic acids were significantly positively related to the available rhizosphere soil Cd and plant Cd. The results indicate that changes in root exudation of oxalic acid and citric acid result in different available Cd contents of the rhizosphere soil, thereby affecting the bioavailability of soil Cd, which increases Cd uptake and accumulation in S. asper but inhibits Cd accumulation in Z. mays.

本研究评估了Sonchus asper L.- Zea mays间作如何影响植物 Cd 水平，以及根分泌物中的有机酸（低分子质量）类型和浓度，这是通过对从土壤中收集的土壤进行盆栽试验来完成的。矿区周围的农田。结果表明，草酸和柠檬酸的酸是在植物根分泌物现行有机酸，并且该间作导致两种酸为突出升高根渗出物浓度S.蝮43.8和75.4％，分别而降低，使得Z. mays 的浓度分别为 18.5% 和 18.7%，与单一栽培相比。据观察，根系分泌物中柠檬酸和草酸的浓度与根际土壤有效镉和植物镉呈显着正相关。结果表明，草酸和柠檬酸根系分泌物的变化导致根际土壤有效Cd含量不同，从而影响土壤Cd的生物有效性，增加了S. asper对Cd的吸收和积累，但抑制了Z.的Cd积累。梅斯。