Aarhus University, Department of Environmental Science, 4000 Roskilde, Denmark.
Aarhus University, Department of Agroecology, 8830 Tjele, Denmark.
Environ Sci Process Impacts. 2021 Jun 24;23(6):855-866. doi: 10.1039/d1em00027f.
We propose a conceptual model that describes the in situ formation of androstenedione in agricultural soil from a phytosterol, β-sitosterol, released after crop harvest and soil fertiliser amendment. Based on the recorded agricultural practice at a spring barley field, β-sitosterol and androstenedione concentrations were modelled over the year. While decomposition of crop residues created low soil levels, the application of pig slurry led to an androstenedione soil concentration of 54 μg kg-1. The elevated soil concentration of androstenedione is not due to the introduction of the endocrine disruptor in the fertiliser, but a result of the addition of large concentrations of β-sitosterol as a natural precursor. The limited available data on β-sitosterol and androstenedione concentration in soil prohibited their accurate prediction by our model. However, the potential implication of endocrine-disrupting steroid hormones being formed in situ from currently little considered phytosterols justifies a conceptual description and further research.
我们提出了一个概念模型，描述了农业土壤中雄烯二酮的原位形成，该雄烯二酮来自作物收获后和土壤肥料添加时释放的植物甾醇β-谷甾醇。基于春大麦田间的记录农业实践，我们对β-谷甾醇和雄烯二酮的浓度进行了年度建模。虽然作物残体的分解导致土壤中含量较低，但猪粪的施用导致土壤中雄烯二酮的浓度达到 54μgkg-1。土壤中雄烯二酮浓度的升高不是由于肥料中引入了内分泌干扰物，而是由于大量天然前体β-谷甾醇的添加。土壤中β-谷甾醇和雄烯二酮浓度的有限可用数据限制了我们模型对其的准确预测。然而，目前很少考虑的植物甾醇在原位形成具有内分泌干扰作用的甾体激素的潜在影响，证明了概念描述和进一步研究的合理性。
