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王腾云, 周国华, 孙彬彬, 贺灵, 曾道明, 陈亚东, 叶荣. 福建沿海地区土壤-稻谷重金属含量关系与影响因素研究[J]. 岩矿测试, 2016, 35(3): 295-301. DOI: 10.15898/j.cnki.11-2131/td.2016.03.013
引用本文: 王腾云, 周国华, 孙彬彬, 贺灵, 曾道明, 陈亚东, 叶荣. 福建沿海地区土壤-稻谷重金属含量关系与影响因素研究[J]. 岩矿测试, 2016, 35(3): 295-301. DOI: 10.15898/j.cnki.11-2131/td.2016.03.013
WANG Teng-yun, ZHOU Guo-hua, SUN Bin-bin, HE Ling, ZENG Dao-ming, CHEN Ya-dong, YE Rong. The Relationship between Heavy Metal Contents of Soils and Rice in Coastal Areas, Fujian Province, including Influencing Factors[J]. Rock and Mineral Analysis, 2016, 35(3): 295-301. DOI: 10.15898/j.cnki.11-2131/td.2016.03.013
Citation: WANG Teng-yun, ZHOU Guo-hua, SUN Bin-bin, HE Ling, ZENG Dao-ming, CHEN Ya-dong, YE Rong. The Relationship between Heavy Metal Contents of Soils and Rice in Coastal Areas, Fujian Province, including Influencing Factors[J]. Rock and Mineral Analysis, 2016, 35(3): 295-301. DOI: 10.15898/j.cnki.11-2131/td.2016.03.013

福建沿海地区土壤-稻谷重金属含量关系与影响因素研究

The Relationship between Heavy Metal Contents of Soils and Rice in Coastal Areas, Fujian Province, including Influencing Factors

  • 摘要: 福建沿海地区土壤Pb含量远高于我国其他地区及全国背景值,其对农产品安全、生态环境的影响值得关注。本文采集该地区典型耕作区58套土壤-水稻样品,查明Pb、Cd等重金属元素含量特征及其关键控制因素。研究表明从水稻根→茎叶→稻谷,重金属元素含量和富集系数呈现明显的下降趋势,有害重金属As、Pb等的递减速率远大于植物营养元素Cu、Zn,指示水稻根部对重金属元素具有一定的阻截作用。土壤-稻谷间Pb具有显著正相关性,显示土壤Pb是稻谷Pb的重要来源;稻谷Pb含量与土壤有机碳呈负相关关系,与土壤pH呈弱负相关关系,说明富含有机碳、相对碱性的土壤环境可降低土壤Pb的生物有效性,减少稻谷对土壤Pb的吸收富集。土壤理化条件对稻谷Cd富集系数有显著影响,富含有机碳、Al2O3、Fe2O3、CaO、MgO、S的土壤条件有利于阻断稻谷对土壤Cd的吸收,降低土壤Cd污染的生态风险。本项研究为开展水田土壤重金属污染治理修复、预测稻谷食用安全提供了依据。

     

    Abstract: Lead content of soil in coastal areas of Fujian Province is higher than that of soil in other areas and in the background level of China, and is therefore of significant influence on food safety and the ecological environment. Based on Pb and Cd contents of 58 suites of soil and rice samples, the characteristic of content and its influencing factors are discussed. Results show that the concentrations and BCF values of heavy metals decrease rapidly from root to stem leaf to rice, and concentrations of toxic elements like arsenic and lead decrease more obviously than those of plant nutrients such as copper and zinc, indicating that rice root has a barrier effect for toxic element uptake. Lead content of rice is positively correlated with that of soil, indicating the soil is the main source of lead in rice. Lead content of rice is negatively correlated with organic carbon contents and pH of soil. This indicates that the abundance of organic carbon and neutral-alkaline soil conditions may reduce bioavailability of lead in soils. The bio-concentration factor of cadmium has a good correlation with physicochemical conditions of soil. Abundance of organic carbon, Al2O3, Fe2O3, CaO, MgO and S can hinder the uptake of cadmium by rice and reduce its eco-risk. This research provides the foundation for restoring paddy fields polluted by heavy metals and contributes in predicting the impact of heavy metal pollution of soil on the safety of rice.

     

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