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A New Sight of Influencing Effects of Major Factors on Cd Transfer from Soil to Wheat ( Triticum aestivum L.): Based on Threshold Regression Model

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  • Zhifan Chen

    (College of Geography and Environmental Science, Henan University, Kaifeng 475004, China
    Henan Engineering Research Center for Control & Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng 475004, China)

  • Wencai Geng

    (School of Economics, Henan University, Jinming District, Kaifeng 475004, China)

  • Xingyuan Jiang

    (College of Geography and Environmental Science, Henan University, Kaifeng 475004, China
    Henan Engineering Research Center for Control & Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng 475004, China)

  • Xinling Ruan

    (College of Geography and Environmental Science, Henan University, Kaifeng 475004, China
    Henan Engineering Research Center for Control & Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng 475004, China)

  • Di Wu

    (College of Geography and Environmental Science, Henan University, Kaifeng 475004, China
    Henan Engineering Research Center for Control & Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng 475004, China)

  • Yipeng Li

    (College of Geography and Environmental Science, Henan University, Kaifeng 475004, China
    Henan Engineering Research Center for Control & Remediation of Soil Heavy Metal Pollution, Henan University, Kaifeng 475004, China)

Abstract

Due to the high toxicity and potential health risk of cadmium (Cd), the influencing effects of major factors (like pH, OM, and clay, etc.) on Cd bioaccumulation and transfer from soil to crop grains are highly concerned. Multiple linear regression models were usually applied in previous literature, but these linear models could not reflect the threshold effects of major factors on Cd transfer under different soil environmental conditions. Soil pH and other factors on Cd transfer in a soil–plant system might pose different or even contrary effects under different soil Cd exposure levels. For this purpose, we try to apply a threshold regression model to analyze the effects of key soil parameters on Cd bioaccumulation and transfer from soil to wheat. The results showed that under different soil pH or Cd levels, several factors, including soil pH, organic matter, exchangeable Cd, clay, P, Zn, and Ca showed obvious threshold effects, and caused different or even contrary impacts on Cd bioaccumulation in wheat grains. Notably, the increase of soil pH inhibited Cd accumulation when pH > 7.98, but had a promotional effect when pH ≤ 7.98. Thus, threshold regression analysis could provide a new insight that can lead to a more integrated understanding of the relevant factors on Cd accumulation and transfer from soil to wheat. In addition, it might give us a new thought on setting regulatory limits on Cd contents in wheat grains, or the inhibitory factors of Cd transfer.

Suggested Citation

  • Zhifan Chen & Wencai Geng & Xingyuan Jiang & Xinling Ruan & Di Wu & Yipeng Li, 2022. "A New Sight of Influencing Effects of Major Factors on Cd Transfer from Soil to Wheat ( Triticum aestivum L.): Based on Threshold Regression Model," IJERPH, MDPI, vol. 19(19), pages 1-15, September.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:19:p:12363-:d:928200
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    References listed on IDEAS

    as
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