Zhang Xiaoqing, Zhu Yuanjie, Li Zhuangzhuang, Li Jiong, Wei Shan, Chen Wangsheng, Ren Dajun, Zhang Shuqin
College of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, 430081, China; Hubei Key Laboratory for Efficient Utilization and Agglomeration of Metallurgic Mineral Resources, Wuhan University of Science and Technology, Wuhan, Hubei, 430081, China.
College of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan, 430081, China.
Environ Res. 2023 Jan 15;217:114968. doi: 10.1016/j.envres.2022.114968. Epub 2022 Nov 28.
Evaluation joint cadmium (Cd) and copper (Cu) phytotoxicity in wide range of subtropical agricultural soils is highly vital for phytoremediation of soils contaminated with Cd and Cu. In this study, barley root elongation assays were performed in 30 representative soils in response to single and combined Cd and Cu inhibition. The single Cd caused nearly 50% inhibition of barley root elongation, and Cu induced more than 50% inhibition in most soils. Mixed Cd + Cu caused significant inhibition on barley growth with average relative root elongation values of 20.0% and 30.4% in soil with a pH < 7 and pH > 7, respectively. An antagonistic interaction was evaluated in combined Cd + Cu toxicity, which was strong in soils containing low soluble Cu and Cd contents. Soil pH was the controlling factor in predicting single and mixed Cd and Cu phytotoxicity, which could explain 44% and 46% variation of single Cd and Cu toxicity, respectively. Soil organic carbon and effective cation exchange capacity were another important factor positively influencing metal toxicity, which further improved empirical prediction models accuracy, with determined coefficient (r) values of 0.44-0.84. These results provide a theoretical basis for soils Cd and Cu pollution control.
评估亚热带多种农业土壤中镉（Cd）和铜（Cu）的植物毒性对于镉和铜污染土壤的植物修复至关重要。在本研究中，针对镉和铜单一及复合抑制作用，在30种代表性土壤中进行了大麦根伸长试验。单一镉对大麦根伸长造成近50%的抑制，而在大多数土壤中，铜导致的抑制超过50%。镉 + 铜混合处理对大麦生长造成显著抑制，在pH < 7和pH > 7的土壤中，平均相对根伸长值分别为20.0%和30.4%。评估了镉 + 铜复合毒性中的拮抗作用，在低可溶性铜和镉含量的土壤中这种作用较强。土壤pH是预测单一及混合镉和铜植物毒性的控制因素，分别可解释单一镉和铜毒性变化的44%和46%。土壤有机碳和有效阳离子交换容量是另一个对金属毒性有正向影响的重要因素，这进一步提高了经验预测模型的准确性，决定系数（r）值为0.44 - 0.84。这些结果为土壤镉和铜污染控制提供了理论依据。
