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Contamination and Spatial Variation of Heavy Metals in the Soil-Rice System in Nanxun County, Southeastern China

There is an increasing concern about heavy metal contamination in farmland in China and worldwide. In order to reveal the spatial features of heavy metals in the soil-rice system, soil and rice samples were collected from Nanxun, Southeastern China. Compared with the guideline values, elevated conce...

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Detalles Bibliográficos
Autores principales: Zhao, Keli, Fu, Weijun, Ye, Zhengqian, Zhang, Chaosheng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4344681/
https://www.ncbi.nlm.nih.gov/pubmed/25635917
http://dx.doi.org/10.3390/ijerph120201577
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author Zhao, Keli
Fu, Weijun
Ye, Zhengqian
Zhang, Chaosheng
author_facet Zhao, Keli
Fu, Weijun
Ye, Zhengqian
Zhang, Chaosheng
author_sort Zhao, Keli
collection PubMed
description There is an increasing concern about heavy metal contamination in farmland in China and worldwide. In order to reveal the spatial features of heavy metals in the soil-rice system, soil and rice samples were collected from Nanxun, Southeastern China. Compared with the guideline values, elevated concentrations of heavy metals in soils were observed, while heavy metals in rice still remained at a safe level. Heavy metals in soils and rice had moderate to strong spatial dependence (nugget/sill ratios: 13.2% to 49.9%). The spatial distribution of copper (Cu), nickel (Ni), lead (Pb) and zinc (Zn) in soils illustrated that their high concentrations were located in the southeast part. The high concentrations of cadmium (Cd) in soils were observed in the northeast part. The accumulation of all the studied metals is related to the long-term application of agrochemicals and industrial activities. Heavy metals in rice showed different spatial distribution patterns. Cross-correlograms were produced to quantitatively determine the spatial correlation between soil properties and heavy metals composition in rice. The pH and soil organic matter had significant spatial correlations with the concentration of heavy metals in rice. Most of the selected variables had clear spatial correlation ranges for heavy metals in rice, which could be further applied to divide agricultural management zones.
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spelling pubmed-43446812015-03-18 Contamination and Spatial Variation of Heavy Metals in the Soil-Rice System in Nanxun County, Southeastern China Zhao, Keli Fu, Weijun Ye, Zhengqian Zhang, Chaosheng Int J Environ Res Public Health Article There is an increasing concern about heavy metal contamination in farmland in China and worldwide. In order to reveal the spatial features of heavy metals in the soil-rice system, soil and rice samples were collected from Nanxun, Southeastern China. Compared with the guideline values, elevated concentrations of heavy metals in soils were observed, while heavy metals in rice still remained at a safe level. Heavy metals in soils and rice had moderate to strong spatial dependence (nugget/sill ratios: 13.2% to 49.9%). The spatial distribution of copper (Cu), nickel (Ni), lead (Pb) and zinc (Zn) in soils illustrated that their high concentrations were located in the southeast part. The high concentrations of cadmium (Cd) in soils were observed in the northeast part. The accumulation of all the studied metals is related to the long-term application of agrochemicals and industrial activities. Heavy metals in rice showed different spatial distribution patterns. Cross-correlograms were produced to quantitatively determine the spatial correlation between soil properties and heavy metals composition in rice. The pH and soil organic matter had significant spatial correlations with the concentration of heavy metals in rice. Most of the selected variables had clear spatial correlation ranges for heavy metals in rice, which could be further applied to divide agricultural management zones. MDPI 2015-01-28 2015-02 /pmc/articles/PMC4344681/ /pubmed/25635917 http://dx.doi.org/10.3390/ijerph120201577 Text en © 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Zhao, Keli
Fu, Weijun
Ye, Zhengqian
Zhang, Chaosheng
Contamination and Spatial Variation of Heavy Metals in the Soil-Rice System in Nanxun County, Southeastern China
title Contamination and Spatial Variation of Heavy Metals in the Soil-Rice System in Nanxun County, Southeastern China
title_full Contamination and Spatial Variation of Heavy Metals in the Soil-Rice System in Nanxun County, Southeastern China
title_fullStr Contamination and Spatial Variation of Heavy Metals in the Soil-Rice System in Nanxun County, Southeastern China
title_full_unstemmed Contamination and Spatial Variation of Heavy Metals in the Soil-Rice System in Nanxun County, Southeastern China
title_short Contamination and Spatial Variation of Heavy Metals in the Soil-Rice System in Nanxun County, Southeastern China
title_sort contamination and spatial variation of heavy metals in the soil-rice system in nanxun county, southeastern china
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4344681/
https://www.ncbi.nlm.nih.gov/pubmed/25635917
http://dx.doi.org/10.3390/ijerph120201577
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