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Pollution characteristics and ecological risk assessment of heavy metals in three land-use types on the southern Loess Plateau, China

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Abstract

The accumulation of heavy metals in agricultural soils has been the subject of great concern because these metals have the potential to be transferred to soil solutions and subsequently accumulate in the food chain. To study the persistence of trace metals in crop and orchard soils, representative surface soil samples were collected from terrace farmland that had been cultivated for various numbers of years (3, 8, 12, 15, and >20 years), terrace orchard land that had been cultivated for various numbers of years (4, 7, 10, 12, 15, 18, 25, and >30 years), and slope farmland with various gradients (3°, 5°, 8°, 12°, 15°, and 25°) and analyzed for heavy metals (As, Cr, Cu, Hg, Ni, and Zn). These samples were collected from Nihegou catchment of Chunhua county in the southern Loess Plateau of China. The six heavy metals demonstrated different trends with time or gradient in the three land-use types. The Cu and Zn contents of the soil were higher than the referee background values of the loessal soil, and the contents of Cr and Ni, and especially those of As and Hg, were lower. Cu was the only heavy metal that just met the Grade III Environmental Quality Standard for Soils of China, while the others reached grade I. Cu and Hg were considered contaminant factors and Hg was a moderate potential ecological risk factor in the catchment. Of the sites investigated, 89.5% fell into the category with a low degree of contamination (C d ) and rest were moderate, while all three land-use types had low potential ecological risk (RI). Changes of C d and RI were consistent with the cultivated time in the terrace farmland and terrace orchard land. Values of RI increased while C d decreased with the increasing of slope gradient in the slope farmland. Evaluating the ecological risk posed by heavy metals using more soil samples in a larger study area is necessary on the Loess Plateau of China.

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Acknowledgments

This work was supported by the National Key R&D Program of China (No. 2016YFD0300301-03) and the Natural Science Foundation of China (No. 41203049). The two anonymous reviewers and the Editor are acknowledged for their comments, which significantly improved the quality of the manuscript.

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Correspondence to Ning Cao.

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Zhang, Y., Wu, F., Zhang, X. et al. Pollution characteristics and ecological risk assessment of heavy metals in three land-use types on the southern Loess Plateau, China. Environ Monit Assess 189, 470 (2017). https://doi.org/10.1007/s10661-017-6140-y

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