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Journal of Integrative Agriculture  2020, Vol. 19 Issue (5): 1375-1386    DOI: 10.1016/S2095-3119(19)62861-3
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The effects of calcium combined with chitosan amendment on the bioavailability of exogenous Pb in calcareous soil
CHANG Hui-qing1, WANG Qi-zhen1, LI Zhao-jun2, WU Jie1, XU Xiao-feng1, SHI Zhao-yong1 
1 Henan University of Science and Technology, Luoyang 471000, P.R.China
2 Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture and Rural Affairs/China-New Zealand Joint Laboratory for Soil Molecular Ecology, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
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Lead (Pb) in soil may accumulate in crops and enter the human body.  This study aimed to understand the speciation transformation and accumulation characteristics of exogenous Pb in calcareous soil with or without the application of soil amendments.  Field experiments with continuous maize cultivation have been carried out for two years.  The results showed that the contents of total Pb were slightly lower in 2016 than in 2015 for the same treatments; however, no significant difference between the years was observed.  Soil Pb existed mainly in the residual fraction without exogenous Pb addition, and its proportion was more than 33% of the total soil Pb in the control and Ca treatments.  When Pb was added to calcareous soil, Pb existed largely in the oxidizable and reducible fractions during the two-year experimental period, and those fractions made up over 83% of the total Pb.  The proportion of the water-soluble Pb, regardless of the addition of Pb, was the lowest and was less than 0.0019% in all treatments, but the addition of Ca and chitosan amendments reduced the water-soluble and exchangeable Pb contents.  The Pb content in different parts of maize followed the order root>leaf>stem>grain during the experimental period.  Although maize had low transfer and enrichment factors in calcareous soil, which make the Pb content in the grain show no significant difference among the five treatments in the same year, adding Ca and chitosan to calcareous soil can reduce the Pb contents of maize, especially reduce the Pb contents of root, stem and leaf.  Therefore, the addition of calcium and chitosan is an effective strategy for reducing Pb availability in calcareous soils.
Keywords:  exogenous Pb        maize        calcareous soil        speciation transformation        amendments  
Received: 22 August 2019   Accepted: 25 March 2020
Fund: The study was funded by the National Key Technology R&D Program of China (2017YFD0801304), and the National Natural Science Foundation of China (41571319).
Corresponding Authors:  Correspondance LI Zhao-jun, Tel: +86-10-82108657, E-mail:   
About author:  CHANG Hui-qing, Tel: +86-379-62836240, E-mail: hqchang;

Cite this article: 

CHANG Hui-qing, WANG Qi-zhen, LI Zhao-jun, WU Jie, XU Xiao-feng, SHI Zhao-yong. 2020.

The effects of calcium combined with chitosan amendment on the bioavailability of exogenous Pb in calcareous soil
. Journal of Integrative Agriculture, 19(5): 1375-1386.

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