文献类型： 外文期刊

作者： Xiang, Diying ¹ ; Zhang, Gang ¹ ; Gong, Ruijuan ² ; Di, Bao ¹ ; Tian, Yaran ¹ ;

作者机构： 1.Hebei Agr Univ, Coll Hort, Lekai South St 2596, Baoding, Hebei, Peoples R China

2.Hebei Acad Agr & Forestry Sci, Inst Cotton, Shijiazhuang, Hebei, Peoples R China

关键词： Heavy metals; Root system; Cd content; water content; Specific extracellular resistance

期刊名称：WATER AIR AND SOIL POLLUTION （ 影响因子：2.52； 五年影响因子：2.574 ）

ISSN： 0049-6979

年卷期： 2018 年 229 卷 8 期

页码：

收录情况： SCI

摘要： The use of plants for ecological remediation is an important method of controlling heavy metals in polluted land. Cotinus coggygria is a landscape plant that is used extensively in landscaping and afforestation. In this study, the cadmium tolerance level of C. coggygria was evaluated using electrical impedance spectroscopy (EIS) to lay a theoretical foundation for broad applications of this species in Cd-polluted areas and provide theoretical support to broaden the application range of the EIS technique. Two-year-old potted seedlings of C. coggygria were placed in a greenhouse to analyse the changes in the growth, water content and EIS parameters of the roots following treatment with different Cd concentrations (50, 100, 200, 500, 1000 and 1500 mg kg(-1)), and soil without added Cd was used as the control. The roots grew well following Cd treatments of 50 and 100 mg kg(-1). The Cd contents increased with the increase in Cd concentration in the soil. However, the lowest root Cd content was found at 4 months of treatment. The extracellular resistance r (e) and the intracellular resistance r (i) increased first overall and then decreased with the increasing Cd concentration, and both parameters increased with a longer treatment duration. The water content had a significant negative correlation with the Cd content (P < 0.01) and the r (e) (P < 0.05). C. coggygria could tolerate a soil Cd concentration of 100 mg kg(-1). There was a turning point in the growth, water content and EIS parameters of the C. coggygria roots when the soil Cd concentration reached 200 mg kg(-1). The root water content and r (e) could reflect the level of Cd tolerance in C. coggygria.