Li Jian, Liu Jingchun, Lu Haoliang, Jia Hui, Yu Junyi, Hong Hualong, Yan Chongling
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361102, China; Institute of Environment and Ecology, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, China.
Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361102, China.
Chemosphere. 2016 Feb;144:2206-13. doi: 10.1016/j.chemosphere.2015.10.128. Epub 2015 Nov 18.
Phenols exert a great influence on the dynamic process of Cd in the soil-plant interface. We investigated the influence of phenols on the biogeochemical behavior of cadmium in the rhizosphere of Avicennia marina (Forsk) Vierh. All combinations of four levels of cadmium (0, 1, 2 and 4 mg/kg DW) and two levels of phenol (0 and 15 mg/kg DW) were included in the experimental design. We found that phenols facilitated increasing concentrations of exchangeable cadmium (Ex-Cd), acid volatile sulfide (AVS) and reactive solid-phase Fe (II) in sediments, and iron in plants, but inhibited Cd accumulation in iron plaque and roots. The concentrations of AVS and reactive solid-phase Fe (II) were significantly positively correlated with Cd treatment. As for the biogeochemical behavior of Cd in mangrove sediments, this research revealed that phenols facilitated activation and mobility of Cd. They disturbed the "source-sink" balance of Cd and turned it into a "source", whilst decreasing Cd absorption in A. marina. Additionally, phenols facilitated iron absorption in the plant and alleviated the Fe limit for mangrove plant growth.
酚类物质对土壤-植物界面中镉的动态过程有很大影响。我们研究了酚类物质对白骨壤（Avicennia marina (Forsk) Vierh.）根际中镉生物地球化学行为的影响。实验设计涵盖了镉的四个水平（0、1、2和4毫克/千克干重）与酚的两个水平（0和15毫克/千克干重）的所有组合。我们发现，酚类物质促使沉积物中可交换镉（Ex-Cd）、酸挥发性硫化物（AVS）和活性固相铁（II）以及植物中铁的浓度增加，但抑制了铁锰结核和根部中镉的积累。AVS和活性固相铁（II）的浓度与镉处理显著正相关。关于镉在红树林沉积物中的生物地球化学行为，这项研究表明酚类物质促进了镉的活化和迁移。它们扰乱了镉的“源-汇”平衡，使其变成一个“源”，同时减少了白骨壤对镉的吸收。此外，酚类物质促进了植物对铁的吸收，并缓解了红树林植物生长的铁限制。
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