The sorption of the allelochemical scopoletin (7-hydroxy-6-methoxycoumarin) was studied in eight agricultural soils and different model sorbents. We also determined its degradation in selected soils and related sorption and degradation results to the expression of scopoletin phytotoxicity in soil towards two model plant species, Eruca vesicaria and Hordeum vulgaris. Scopoletin was sorbed to a greater extent in acid soils than in alkaline soils. Correlations with soil properties indicated that the soil pH and fine (silt/clay) fraction played a primary role in the sorption of scopoletin by soils. Weak interactions controlled its sorption in acid soils, whereas stronger interactions, probably with mineral clay constituents, became more relevant in alkaline clay soils. Dissipation of scopoletin in the soils was microbial-mediated and occurred more slowly in acid than alkaline soils. As a result, the phytotoxic activity of scopoletin was expressed in acid but not in alkaline soil. The results point to the influence that soil properties are expected to exert on the expression of the phytotoxicity of scopoletin in natural and agricultural ecosystems.

研究了八种农业土壤和不同模型吸附剂对化感性大麦草素（7-羟基-6-甲氧基香豆素）的吸附。我们还确定了在选定的土壤和相关的吸附和降解效果退化土壤东莨菪药害表达对两个型植物物种，芸vesicaria和大麦寻常。在酸性土壤中，比天然土壤中的天冬菊酯更易被吸收。与土壤特性的相关性表明，土壤的pH值和细颗粒（淤泥/粘土）在土壤中scopoletin的吸附中起主要作用。弱相互作用控制了其在酸性土壤中的吸附，而更强的相互作用（可能与矿物粘土成分）在碱性粘土中变得更加重要。大麦草根素在土壤中的耗散是微生物介导的，在酸性条件下的发生速度比碱性土壤慢。结果，草素的植物毒性活性在酸性中表达，而在碱性土壤中不表达。结果表明，土壤性质有望对天然和农业生态系统中pole草素的植物毒性表达产生影响。