Heavy Metal Pollution in a Soil-Rice System in the Yangtze River Region of China
Heavy Metal Pollution in a Soil-Rice System in the Yangtze River Region of China
复制标题
中国长江流域土壤-水稻系统重金属污染
DOI：
10.3390/ijerph13010063
复制
发表时间：
2016-01-01
影响因子：
--
通讯作者：
Zhu, Cheng
中科院分区：
文献类型：
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作者：
Liu, Zhouping;Zhang, Qiaofen;Zhu, Cheng
重金属被认为是环境中有毒的微量元素。土壤或稻米中的重金属污染日益受到关注。在这项研究中，101对土壤和水稻样品收集了中国沿着长江的主要产区。土壤性质和重金属（即，通过分析土壤和水稻籽粒中Cd、Hg、Pb和Cr的含量，评价了土壤-水稻系统中重金属的累积特征。结果表明，土壤中Cd、Hg、Pb和Cr的含量范围分别为0.10 ~ 4.64、0.01 ~ 1.46、7.64 ~ 127.56和13.52 ~ 231.02 mg·kg-1。Cd、Hg、Pb和Cr分别占总样品的37%、16%、60%和70%。土壤-水稻系统中重金属污染程度存在区域差异。重金属元素之间的相互作用也可能影响重金属在土壤或水稻中的迁移和积累。重金属在土壤和水稻籽粒中的积累与土壤pH和有机质有一定的关系。本研究为我国水稻安全生产提供了土壤重金属积累的信息。该研究结果也为生态保护和食品安全风险评估提供了可靠的科学依据。
Heavy metals are regarded as toxic trace elements in the environment. Heavy metal pollution in soil or rice grains is of increasing concern. In this study, 101 pairs of soil and rice samples were collected from the major rice-producing areas along the Yangtze River in China. The soil properties and heavy metal (i.e., Cd, Hg, Pb and Cr) concentrations in the soil and rice grains were analyzed to evaluate the heavy metal accumulation characteristics of the soil-rice systems. The results showed that the Cd, Hg, Pb and Cr concentrations in the soil ranged from 0.10 to 4.64, 0.01 to 1.46, 7.64 to 127.56, and 13.52 to 231.02 mg·kg−1, respectively. Approximately 37%, 16%, 60% and 70% of the rice grain samples were polluted by Cd, Hg, Pb, and Cr, respectively. The degree of heavy metal contamination in the soil-rice systems exhibited a regional variation. The interactions among the heavy metal elements may also influence the migration and accumulation of heavy metals in soil or paddy rice. The accumulation of heavy metals in soil and rice grains is related to a certain extent to the pH and soil organic matter (SOM). This study provides useful information regarding heavy metal accumulation in soil to support the safe production of rice in China. The findings from this study also provide a robust scientific basis for risk assessments regarding ecological protection and food safety.