5个蓖麻品种对土壤中镉富集的差异

为了评价能源作物蓖麻对污染农田中重金属镉(Cd)的富集修复能力,本研究以5个蓖麻品种为试验材料,通过大田试验对比了不同蓖麻品种在Cd污染农田中的生长情况、对Cd的富集和转运能力以及对Cd污染土壤的修复能力.结果 表明,5个蓖麻品种在Cd污染农田中生长良好,其中滇蓖2号的株高、茎粗及单株产量显著高于其他品种,分别为440...

Evaluation of Cadmium Enrichment Capacity of Five Castor Varieties in Cd-polluted Soil

In order to evaluate the enrichment and remediation capacity of castor on heavy metal cadmium (Cd) in polluted farmland, five castor varieties were selected for field trials. The agronomic characteristics, yield,Cd enrichment and translocation capacity, remediation capacity in Cd contaminated soil were investigated. The results showed that the five varieties of castor grew well in Cd-polluted farmland. The plant height, stem diameter and seed yield per plant of Dianbi2 were 440.78 cm,5.04 cm and 338.85 g, respectively, which were significantly higher than other varieties. The Cd content, Cd accumulation in roots, stems, leaves, and fruits, and enrichment coefficients were significantly different among five castor varieties. The Cd content in roots, stems, and fruits of Jingzuobima1 were 1.40 mg·kg^-1, 1.14 mg·kg^-1 and 0.33 mg·kg^-1, respectively, which were significantly higher than other varieties. In terms of remediation capacity, the Cd accumulation of Dianbi2 was 3.38 mg per plant, while the annual extraction rate was 5.34%, which was significantly higher than other varieties. Although Jingzuobima1 has the strongest enrichment capacity, its Cd accumulation and annual extraction efficiency are the lowest due to its smallest biomass. This study shows that castor has a strong enrichment capacity to accumulate heavy metal Cd in soil and can be used to remediate the Cd-polluted soil in Gejiu, Yunnan province, and planting Dianbi2 can result in a better remediation effect. This study provides a theoretical basis and reference for remediation of Cd polluted areas in Yunnan.