The effects of calcium combined with chitosan amendment on the bioavailability of exogenous Pb in calcareous soil

作     者：CHANG Hui-qing WANG Qi-zhen LI Zhao-jun WU Jie XU Xiao-feng SHI Zhao-yong CHANG Hui-qing;WANG Qi-zhen;LI Zhao-jun;WU Jie;XU Xiao-feng;SHI Zhao-yong

作者机构：Henan University of Science and TechnologyLuoyang 471000P.R.China Key Laboratory of Plant Nutrition and FertilizerMinistry of Agriculture and Rural Affairs/China-New Zealand Joint Laboratory for Soil Molecular EcologyInstitute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijing 100081P.R.China 

出 版 物：《Journal of Integrative Agriculture》 (农业科学学报（英文版）)

年 卷 期：2020年第19卷第5期

页      面：1375-1386页

核心收录：

学科分类：12[管理学] 082803[工学-农业生物环境与能源工程] 08[工学] 0710[理学-生物学] 0832[工学-食品科学与工程（可授工学、农学学位）] 1204[管理学-公共管理] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 1004[医学-公共卫生与预防医学(可授医学、理学学位)] 0905[农学-畜牧学] 0828[工学-农业工程] 0906[农学-兽医学] 0901[农学-作物学] 0703[理学-化学] 0902[农学-园艺学] 120405[管理学-土地资源管理] 0713[理学-生态学] 

基　　金：funded by the National Key Technology R&D Program of China(2017YFD0801304) the National Natural Science Foundation of China(41571319) 

主　　题：exogenous Pb maize calcareous soil speciation transformation amendments 

摘      要：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 rootleafstemgrain 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.