Concentration of Heavy Metals in Soils and Rice and Its Influence by Soil pH in Jinqu Basin

LIU Dong; HE Ling; WEN Xue-qin; SUN Bin-bin; ZENG Dao-ming; WU Chao; CHENG Xiao-meng

doi:10.15898/j.cnki.11-2131/td.202011100139

LIU Dong, HE Ling, WEN Xue-qin, SUN Bin-bin, ZENG Dao-ming, WU Chao, CHENG Xiao-meng. Concentration of Heavy Metals in Soils and Rice and Its Influence by Soil pH in Jinqu Basin[J]. Rock and Mineral Analysis, 2021, 40(6): 883-893. DOI: 10.15898/j.cnki.11-2131/td.202011100139

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Concentration of Heavy Metals in Soils and Rice and Its Influence by Soil pH in Jinqu Basin

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BACKGROUNDThe absorption of heavy metals in soil by crops is affected by various factors such as crop types, collection sites and physical and chemical soil properties. In recent years, soil acidification of an area in the Jinqu Basin has increased year by year, and the degree of acidification has gradually deepened.OBJECTIVESIn order to find out the content characteristics of heavy metals in soil and crops, the influence of soil acidification on the absorption of heavy metals by crops was studied.METHODSBased on 264 samples of root soil-rice samples from a typical area of the Jinqu Basin, the characteristics and influencing factors of heavy metal content in soil and crops were studied.RESULTSThe results showed that: (1) The variation coefficient of most heavy metal elements in 264 soil samples was greater than 0.5. Significant positive correlations (P < 0.01) occurred among the elements of As, Cd, Cr, Cu, Ni, and Zn in soil. 23 soil samples of Cd exceeded the standard, and the over-standard rate was 8.7%. The soil samples number of other elements(As, Cr, Cu, Hg, Ni, Pb and Zn) exceeding the standard were no more than 2. (2) The contents of Cu, Zn and Cd in rice were positively correlated, and the enrichment coefficient of the toxic heavy metal element Cd was higher than that of plant nutrient elements Cu and Zn. (3) Zn and Cu in rice were positively correlated with soil pH at P < 0.1. Bioconcentration factor (BCF) of Cd, Cr and Hg were negatively correlated with pH.CONCLUSIONSIt is believed that adjusting soil acidity will reduce the activity of Cd, Hg and other heavy metal elements in the soil, in order to achieve the goal of minimizing the absorption and transport of heavy metal elements in crops. The research results provide scientific data for local food production safety decision and reference for land management and protection.

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Concentration of Heavy Metals in Soils and Rice and Its Influence by Soil pH in Jinqu Basin

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