Modelling bioaccumulation of heavy metals in soil-crop ecosystems and identifying its controlling factors using machine learning

Environmental Pollution
Bifeng HuZhou Shi

Abstract

The prediction and identification of the factors controlling heavy metal transfer in soil-crop ecosystems are of critical importance. In this study, random forest (RF), gradient boosted machine (GBM), and generalised linear (GLM) models were compared after being used to model and identify prior factors that affect the transfer of heavy metals (HMs) in soil-crop systems in the Yangtze River Delta, China, based on 13 covariates with 1822 pairs of soil-crop samples. The mean bioaccumulation factors (BAFs) for all crops followed the order Cd > Zn > As > Cu > Ni > Hg > Cr > Pb. The RF model showed the best prediction ability for the BAFs of HMs in soil-crop ecosystems, followed by GBM and GLM. The R2 values of the RF models for the BAFs of Zn, Cu, Cr, Ni, Hg, Cd, As, and Pb were 0.84, 0.66, 0.59, 0.58, 0.58, 0.51, 0.30, and 0.17, respectively. The primary controlling factor in soil-to-crop transfer of all HMs under study was plant type, followed by soil heavy metal content and soil organic materials. The model used herein could be used to assist the prediction of heavy metal contents in crops based on heavy metal contents in soil and other covariates, and can significantly reduce the cost, labour, and time requirements involved with...Continue Reading

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Citations

Sep 28, 2020·Environmental Science and Pollution Research International·Varinder Singh KanwarLata Rani
Oct 18, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Ștefan-Mihai PetreaVictor Cristea
Dec 29, 2020·Chemosphere·Mohammad Sakizadeh, Jose Antonio Rodríguez Martín
Feb 5, 2021·Environmental Pollution·Qiao XuJiyan Shi
Jan 29, 2021·International Journal of Environmental Research and Public Health·Shufeng SheZhou Shi
Apr 18, 2021·The Science of the Total Environment·Yefeng JiangZhou Shi
Jun 3, 2021·Sensors·Lefteris BenosDionysis Bochtis
Jul 10, 2021·Bulletin of Environmental Contamination and Toxicology·Zijin BianLonghua Wu
Aug 3, 2021·Journal of Hazardous Materials·G GenovaG Niedrist
Aug 24, 2021·The Science of the Total Environment·Divya LakshmiGovarthanan Muthusamy

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