硫对地球表层生态系统中镉迁移转化影响的研究进展：以土壤-植物系统为例

张敏; 胡学玉; 胡晓晓; 王子劲; 曹坤坤

doi:10.19509/j.cnki.dzkq.2021.0089

硫对地球表层生态系统中镉迁移转化影响的研究进展：以土壤-植物系统为例

doi: 10.19509/j.cnki.dzkq.2021.0089

基金项目:

湖北省技术创新专项重大项目 2019ABA118

中央高校基本科研业务费专项 CUG170103

详细信息

作者简介:
张敏(1998—)，女，现正攻读环境科学与工程专业硕士学位，主要从事土壤污染修复研究工作。E-mail：15617192832@163.com

通讯作者:
胡学玉(1963—)，女，教授，主要从事土壤环境化学相关教学与科研工作。E-mail：huxueyu@cug.edu.cn

中图分类号: X171
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出版历程
- 收稿日期: 2021-09-09

Research progress on the effects of sulfur on the migration and transformation of cadmium in the earth surface ecosystem: A case study of soil-plant system

摘要

摘要:
硫作为植物体内蛋白质、多种酶和其他生理活性物质的重要组成成分，具有不可替代性，是作物生长必需营养元素。由于硫元素的化学特征及其特殊的生理功能，使得硫在地表生态系统的迁移转化过程中与重金属元素镉的生态环境效应产生一定的耦合作用，并直接或间接影响镉在土壤-植物系统中的迁移和累积。在一定土壤环境条件下，硫通过价态变化直接与重金属元素镉发生作用，影响镉的生物有效性; 另外，硫可通过影响植物根表铁锰胶膜的形成改变镉在土壤中的迁移性; 其次，借助植物体内有机硫化合物的合成间接影响镉在植物体内不同部位的迁移与积累。目前硫对土壤-植物系统中镉迁移积累影响的研究结果不尽一致，两种元素的相互作用存在多向性和复杂性，这可能与土壤环境条件、植物根际微域差异等因素有关，且相关综述性的工作较少。因此，本研究综合国内外相关研究，介绍了硫与镉在土壤-植物系统中的交互作用，并分析了硫影响下镉在土壤-植物系统中迁移累积的相关机制及成因，为硫素及其化合物应用于重金属镉污染农用地土壤的治理及其安全利用提供参考。
- 硫 /
- 镉 /
- 土壤-植物 /
- 影响因素 /
- 地球表层 /
- 生态系统
Abstract:
Sulfur, as an important component of protein, enzymes and other physiological active substances in plants, is irreplaceable and essential for crop growth. Due to the chemical characteristics of sulfur and its special physiological functions, sulfur has a certain coupling effect with the ecological environment effect of cadmium in the process of migration and transformation in the surface ecosystem, and directly or indirectly affects the migration and accumulation of cadmium in the soil-plant system. Under certain soil environment conditions, sulfur directly interacts with cadmium through valence change and affects its bioavailability; in addition, it can change the migration of Cd in soil by affecting the formation of Fe/Mn plaque on root surface; secondly, it indirectly affects the migration and accumulation of cadmium in different parts of plants through the synthesis of organic sulfur compounds in plants. At present, the research results on the effect of sulfur on cadmium migration and accumulation in soil-plant system are not consistent, the interaction between the two elements is multi-directional and complex, which may be related to soil environmental conditions, differences in plant rhizosphere micro domain and other factors, and the related review work is less. Therefore, the interaction between sulfur and cadmium in soil-plant system was introduced in this paper, and the mechanism and causes of cadmium migration and accumulation in soil-plant system under the influence of sulfur were analyzed, which provided reference for the application of sulfur and its compounds in the treatment and safe utilization of heavy metal cadmium contaminated agricultural soil.
- sulfur /
- cadmium /
- soil-plant /
- influencing factors /
- earth surface /
- ecosystem

HTML全文

图 1 硫调节植物镉积累及其耐受作用过程的关键信号传导和代谢途径

LMW Cd-PCs.低分子量的Cd-PCs螯合物; HMW Cd-PCs-S.高分子量的Cd-PCs-S螯合物; SOD.超氧化物歧化酶; APX.抗坏血酸过氧化物酶; MDHA.单脱氢抗坏血酸; MDHAR.单脱氢抗坏血酸还原酶; DHA.脱氢抗坏血酸; DHAR.脱氢抗坏血酸还原酶; GR.谷胱甘肽还原酶; GSSG.氧化型谷胱甘肽
a.GSH合成及PCs螯合Cd²⁺过程; b.AsA-GSH循环

Figure 1. Partial metabolic and signal transduction pathways of sulfur in regulating cadmium accumulation and tolerance

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