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Journal of Heavy Metal Research
Quarterly Publication

The destructive effects of heavy metals on plant health, soil quality, and agricultural productivity

https://doi.org/10.22034/jhmr.2025.555963.1005
Volume 1, Issue 1 - Serial Number 1
Winter 2026
Pages 1-6
Journal of Heavy Metal Research

Document Type : Review

Author

Abbas Abhari

Research Center of Geographical Sciences and Social Studies, Hakim Sabzevari University

Abstract
Heavy metal contamination poses a significant threat to plant health, soil quality, and agricultural productivity. This review explores the sources, physiological impacts, and biochemical mechanisms underlying heavy metals toxicity in plants. Common heavy metals of concern include cadmium (Cd), lead (Pb), mercury (Hg), nickel (Ni), chromium (Cr), copper (Cu), and zinc (Zn), which originate from both natural processes and anthropogenic activities and anthropogenic activities including industrial emissions, fertilizers, pesticides, and wastewater irrigation. Excessive accumulation of these elements disrupts plant metabolism by generating reactive oxygen species (ROS), leading to oxidative stress, enzyme inhibition, membrane damage, and impaired photosynthesis. Experimental studies show that cadmium and nickel stress significantly alter antioxidant enzyme activities—such as catalase, peroxidase, and superoxide dismutase—indicating a defensive response to oxidative imbalance. Morphological symptoms of metal toxicity include chlorosis, stunted growth, reduced yield, and reproductive failure. In addition to direct plant effects, heavy metals disturb soil microbial communities, alter pH, and inhibit processes like nitrogen fixation and decomposition. Effective mitigation requires regular soil monitoring, use of biochar and organic amendments, phytoremediation with hyperaccumulator plants, and balanced nutrient management. Understanding these interactions provides a foundation for sustainable soil management and the development of resilient crop systems in metal-polluted environments. This review synthesizes current understanding of heavy metal ecotoxicology in agricultural systems and emphasizes the need for integrated management approaches to ensure food safety and environmental sustainability.

Keywords

Heavy metals
Oxidative stress
Antioxidant enzymes
Phytotoxicity
Soil contamination
Phytoremediation
Subjects
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  • Receive Date 28 October 2025
  • Revise Date 10 November 2025
  • Accept Date 12 November 2025
  • Publish Date 01 February 2026

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