The objective of this study was to test the tolerance of two species of Schinus and two species of Handroanthus cultivated in iron mining tailings from the rupture of the dam in Mariana, Brazil. Samples of mining tailings were collected 1 km away from the dam location and then dried, stored in plastic bags and further analysed for elemental composition. The seeds, later seedlings, were cultivated in the mining waste and in sand in two experiments separately and the experimental design was in a 2 × 3 factorial scheme (two substrates and three combinations of species), with six replications (n = 36). After 60 d of the establishment of the experiments, the germination data, biometric and anatomical measurements of the leaves were evaluated, in addition to the elemental characterization of the tailings. Mining tailings showed macro and micronutrients in addition to potentially toxic elements (As, Al, Cr, Pb and Ni). Seeds germinated and seedlings survived in the mining tailings. Mining tailings reduced the seedling emergence in Handroanthus, whereas it increased the emergence in S. molle and had no significant effect in S. terebinthifolia. Mining tailings reduced the number and length of roots in Schinus but increased these traits in Handroanthus species. Moreover, mining tailings reduced the fresh mass in Handroanthus but had no effect in the Schinus species. Mining tailings reduced the palisade and spongy parenchyma Handroanthus but only the spongy parenchyma was reduced in Schinus species. Therefore, mining tailings provided conditions for seed germination and seedling growth and Schinus species showed higher tolerance.

本研究的目的是测试巴西马里亚纳大坝破裂后在铁矿尾矿中培养的两种Schinus和两种Handroanthus的耐受性。在距大坝位置 1 公里处收集采矿尾矿样品，然后将其干燥，储存在塑料袋中，并进一步分析元素成分。种子，后来的幼苗，分别在采矿废料和沙子中培养，分别在两个实验中进行，实验设计采用 2×3 因子方案（两种基质和三种物种组合），重复 6 次（n= 36)。在实验建立 60 天后，除了尾矿的元素特征外，还评估了叶片的发芽数据、生物特征和解剖测量。除了潜在的有毒元素（As、Al、Cr、Pb 和 Ni）外，尾矿还含有大量和微量营养素。种子发芽，幼苗在采矿尾矿中存活。尾矿开采减少了Handroanthus的出苗率，而增加了S. molle的出苗率，而对S. terebinthifolia没有显着影响。尾矿开采减少了Schinus根的数量和长度，但增加了Handroanthus的这些特征物种。此外，尾矿的开采减少了Handroanthus的新鲜质量，但对Schinus物种没有影响。采矿尾矿减少了栅栏和海绵薄壁组织Handroanthus但只有海绵薄壁组织在Schinus物种中减少。因此，开采尾矿为种子萌发和幼苗生长提供了条件，而石竹品种表现出更高的耐受性。