Effects of heterogeneous Cd stress on root growth of Vicia faba and Sonchus asper

• Published in: Journal of agricultural resources and environment 2019-01, Vol.36 (1), p.62
• Main Authors: Li, Bo, Xing-Chao, Yuan, Fang-Dong, Zhan, Xiao-Qing, Yin, Jiang, Ming, Li, Qin, Yan-Qun, Zu, Li, Yuan
• Format: Article
• Language: Chinese
• Subjects: Agriculture; Cadmium; Corn; Ecology; Greenhouses; Heavy metals; Morphology; Patches (structures); Science; Soil contamination; Soil depth; Soil sciences; Soils; Sonchus; Sonchus asper; Stress; Surface area; Vicia faba
• ISSN: 2095-6819; 2095-6819
• DOI: 10.13254/j.jare.2017.0313

为了研究蚕豆和续断菊根系对异质Cd胁迫的生态学响应，探讨间作体系影响Cd累积的根系可塑性机理，以蚕豆和Cd富集植物续断菊为试验材料，设置异质Cd胁迫根箱模拟试验，将根箱平均分为左、右两室，分别填充Cd处理（50 mg·kg-1）土壤和无Cd土壤，分别测定蚕豆和续断菊的根长、根表面积、根体积等形态指标，比较异质Cd胁迫对蚕豆和续断菊根系生长影响的差异。结果表明，异质Cd胁迫下，蚕豆的根长、根表面积、根体积表现为无Cd右室大于Cd胁迫左室，续断菊表现为Cd胁迫左室大于无Cd右室。蚕豆根系直径为0~0.5 mm、土壤深度为15~20 cm时，无Cd右室根长、根表面积和根体积是Cd胁迫左室的4.63、3.14倍和2.39倍；根系直径为0.5~1 mm和大于1 mm、土壤深度为30~35 cm时，无Cd右室根长分别是Cd胁迫左室的1.69倍和5.04倍，根表面积分别是Cd胁迫左室的1.78倍和5.05倍，根体积分别是Cd胁迫左室的1.85倍和33.00倍。续断菊根系直径为0~0.5 mm、土壤深度为0~5 cm时，Cd胁迫左室根长、根表面积和根体积是无Cd右室的1.66、1.36倍和1.57倍；根系直径为0.5~1 mm、土壤深度为35~40 cm时，Cd胁迫左室根长、根表面积和根体积是无Cd右室的2.86、2.16倍和2.81倍；根系直径大于1 mm、土壤深度为15~20 cm时，Cd胁迫左室根长、根表面积和根体积是无Cd右室的26.94、52.26倍和139.33倍。综上结果表明Cd胁迫抑制了蚕豆根系的生长，促进了续断菊根系的生长，这可能是蚕豆和续断菊间作模式修复Cd污染土壤的机理之一。 A controlled glasshouse experiment was conducted to explore the effects of heterogeneous Cd stress on root growth of Vicia faba and Sonchus asper. The root length, root surface area and root volume were examined. The results showed that the root length, root surface area and root volume of Vicia faba was greater increas