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[1]WANG Lixin,LI Haibo,LI Yinghua,et al.Effects of Freeze-Thaw Cycle on the Physical and Chemical Properties and Pb Transformation of Brown Soil[J].Research of Soil and Water Conservation,2022,29(06):199-205.

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Effects of Freeze-Thaw Cycle on the Physical and Chemical Properties and Pb Transformation of Brown Soil

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 06 Page number: 199-205 Column: Public date: 2022-10-20

Title:: Effects of Freeze-Thaw Cycle on the Physical and Chemical Properties and Pb Transformation of Brown Soil

Author(s):: WANG Lixin, LI Haibo, LI Yinghua, LI Geng, ZHANG Chenxi, DENG Ningcan; (School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China)

Keywords:: freeze-thaw cycles; brown soil; Pb; physical and chemical property; transformation

CLC:: X131.3

DOI:: -

Abstract:: In order to explore the effects of Freeze-Thaw Cycles on soil properties and heavy metals under the background of climate change, simulated experiments were used to explore the effects of the frequency of the Freeze-Thaw Cycle on brown soil micro-aggregates, pH value, electrical conductivity(EC), organic matter(OM), cation exchange capacity(CEC), PO^3-₄, enzyme activity, transformations of Pb and the influence of each form content, which reveal the correlation between Pb transformations and soil physical and chemical properties under periodic Freeze-Thaw Cycles. The results show that: Freeze-Thaw Cycle disturbance causes a ratio of 2～0.25 mm particle decrease, a ratio of 0.25～0.05 mm particle increase, and the stability of micro-aggregates is destroyed, pH value, EC, OM, CEC and urease(URE)activity of the soil increase, PO^3-₄, and catalase(CAT)activity decrease. Specifically, when the Freeze-Thaw Cycle increases, the content of Acid Soluble Pb increases(p<0.05). It was observed that the content of Reducible Pb first increases and then decreases, the content of Residual Pb happens to be the opposite of reducible Pb, and the content of Oxidisable Pb fluctuates. In addition, the Pb extracted by weak acid and PO^3-₄(p<0.05), the Reducible Pb and soil pH value(p<0.05), the Oxidisable Pb and OM(p<0.05)have a significantly positive correlation respectively. Studies have shown that Freeze-Thaw Cycle can increase the eco-toxicity of Pb by changing the physical and chemical properties of the soil, which increases the environmental risk of Pb to deep soil, groundwater and the atmosphere to a certain extent.

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Last Update: 2022-10-20