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Liming increases yield and reduces grain cadmium concentration in rice paddies: a meta-analysis

机译：石灰提高产量并降低稻田籽粒镉浓度：荟萃分析

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摘要

Background and aims In China and several other rice growing countries, lime application is a common practice to alleviate soil acidification in rice paddies. Liming may also reduce the concentration of the common toxin Cadmium (Cd) in rice plants. We evaluated to what extent lime application affects rice yield and grain Cd concentration. Methods We conducted a meta-analysis to quantify the effect of liming on rice yield and grain Cd concentration, synthesizing data from 35 studies. Results Averaged across our dataset, lime application significantly increased rice yield (+ 12.9) and soil pH (+ 0.85 units), and reduced grain Cd concentrations (-48). Overall, grain Cd uptake and soil available Cd were reduced by 48 and 44 under liming, respectively. Liming increased rice yield more strongly 1) in soils with initial pH = 4.5, and 2) at lime rates >= 3.0 t ha(-1) than at lime rates < 3.0 t ha(-1). Liming-induced reductions in grain Cd concentration, grain Cd uptake and soil available Cd all increased with lime application rates. Lime application rates exceeding 1.0 and 6.0 t ha(-1) reduced average grain Cd concentrations to meet food safety standards set by the FAO/WHO and China, respectively. Conclusions Lime application is effective in both enhancing grain yield and reducing grain Cd concentrations in acidic rice paddies.
机译：背景和目的 在中国和其他几个水稻种植国，施用石灰是缓解稻田土壤酸化的常用做法。石灰还可以降低水稻植物中常见毒素镉（Cd）的浓度。我们评估了石灰施用对水稻产量和籽粒镉浓度的影响程度。方法 综合35项研究资料，定量石灰对水稻产量和籽粒Cd含量的影响。结果 在我们的数据集中，施用石灰显著提高了水稻产量（+12.9%）和土壤pH值（+0.85单位），并降低了籽粒Cd浓度（-48%）。总体上，石灰处理下籽粒镉吸收量和土壤速效镉分别降低了48%和44%。1）初始pH值= 4.5的土壤更能提高水稻产量，2）石灰用量>= 3.0 t ha（-1）的土壤比石灰用<3.0 t ha（-1）的土壤更能提高水稻产量。石灰诱导的籽粒Cd浓度、籽粒Cd吸收量和土壤速效Cd的降低均随石灰施用量的增加而增加。石灰施用量超过1.0和6.0 t ha（-1）可降低谷物平均镉浓度，分别达到粮农组织/世界卫生组织和中国制定的食品安全标准。结论 施用石灰可有效提高酸性稻田产量，降低籽粒Cd浓度。

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  • 来源
    《Plant and Soil》 |2021年第2期|157-169|共13页
  • 作者

    Liao Ping; Huang Shan; Zeng YongjunShao HuaZhang Junvan Groenigen Kees Jan;

  • 作者单位

    Yangzhou Univ, Res Inst Rice Ind Engn Technol, Jiangsu Coinnovat Ctr Modern Prod Technol Grain C, Nurturing Ctr,Jiangsu Natl Key Lab Crop Genet & P, Yangzhou 225009, Jiangsu, Peoples R China;

    Jiangxi Agr Univ, Minist Educ, Nanchang 330045, Jiangxi, Peoples R China;

    Soil & Fertilizat Technol Extens Stn Jiangxi Prov, Nanchang 330046, Jiangxi, Peoples R ChinaChinese Acad Agr Sci, Inst Crop Sci, Beijing 100081, Peoples R ChinaUniv Exeter, Dept Geog, Coll Life & Environm Sci, Exeter EX4 4RJ, Devon, England;

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  • 原文格式 PDF
  • 正文语种 英语
  • 中图分类 土壤学;
  • 关键词

    Food safety; Soil acidification; Soil contamination; Heavy metal; Cadmium uptake;

    机译：食品安全;土壤酸化;土壤污染;重金属;镉吸收;

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