Strategies to manage the risk of heavy metal(loid) contamination in agricultural soils

doi:10.15302/J-FASE-2020335

Front. Agr. Sci. Eng.

2020, Vol. 7

Issue (3) : 333-338 https://doi.org/10.15302/J-FASE-2020335

REVIEW

Strategies to manage the risk of heavy metal(loid) contamination in agricultural soils

Fang-Jie ZHAO(

)

College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China

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Abstract

Soil contamination with heavy metal(loid)s threatens soil ecological functions, water quality and food safety; the latter is the focus of this review. Cadmium (Cd) and arsenic (As) are the toxic elements of most concern for food safety because they are relatively easily taken up by food crops. Rice is a major contributor of both Cd and As intakes to the Chinese population. Contamination and soil acidification are the main causes of high Cd levels in rice grains produced in some areas of southern China. The risk of Cd and As accumulation in food crops can be mitigated through agronomic practices and crop breeding. Liming is effective and economical at reducing Cd uptake by rice in acid soils. Paddy water management can produce opposite effects on Cd and As accumulation. Many genes controlling Cd and As uptake and translocation have been characterized, paving the way to breeding low accumulating crop cultivars through marker-assisted molecular breeding or genetic engineering. It is important to protect agricultural soils from future contamination. Long-term monitoring of anthropogenic additions and accumulation of heavy metal(loid)s in agricultural soils should be undertaken. Mass-balance models should be constructed to evaluate future trends of metal(loid)s in agricultural soils at a regional scale.

Keywords arsenic cadmium food safety heavy metals soil contamination

Corresponding Author(s): Fang-Jie ZHAO

Just Accepted Date: 07 May 2020 Online First Date: 27 May 2020 Issue Date: 28 July 2020

Cite this article:

Fang-Jie ZHAO. Strategies to manage the risk of heavy metal(loid) contamination in agricultural soils[J]. Front. Agr. Sci. Eng. , 2020, 7(3): 333-338.

URL:

https://academic.hep.com.cn/fase/EN/10.15302/J-FASE-2020335
https://academic.hep.com.cn/fase/EN/Y2020/V7/I3/333

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