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| Effects of River and Lake Sediments on Cultivated Soil DTPA-extractable Heavy Metals and Other Properties |
| Received:July 22, 2014 |
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| KeyWord:soil heavy metal;DTPA;sulfur;acidification |
| Author Name | Affiliation | E-mail | | ZHAO Ru-dong | College of Environment & Natural Resources, Zhejiang University, Hangzhou 310058, China | | | HU Yi-lian | College of Environment & Natural Resources, Zhejiang University, Hangzhou 310058, China | | | Ed Barrett-Lennard | Institute of Agriculture, the University of Western Australia, Crawley, WA 6009, Australia | | | Neil Coles | Institute of Agriculture, the University of Western Australia, Crawley, WA 6009, Australia | | | JIANG Can-lan | College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | WU Jia-ping | Institute of Islands and Coastal Ecosystems, Zhejiang University, Hangzhou 310058, China | jw67@zju.edu.cn |
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| Abstract: |
| River sediment is rich in organic materials and could be used to amend cultivated soils. However, heavy metals in river sediment may threaten soil health and subsequently crop performance following the river sediment applied to soils. This study investigated DTPA-extractable heavy metals in cultivated soils amended with river sediment in river network plain area, Southern China. Soil samples were collected from selected paddy fields and dry land where river sediment had been applied(200~300 t·hm-2), soils from fields without river sediment application as controls. Soil pH decreased obviously(the lowest value was 3.63), while soil available sulfur, electric conductivity, and DTPA-extractable heavy metals(Ni, Zn, As, Cr, Co, Cu, Hg and Sn) increased obviously after sediment applications. The highest values of both soil available sulfur and electric conductivity were observed in dry land(1 667.74 mg·kg-1 and 2 216.67 μS·cm-1, respectively). Statistical analysis(Correlation analysis, cluster analysis and principal component analysis) further showed that river sediment applications caused the enhancement of soil heavy metals in the fields. The present results suggest that accelerated soil acidification and high DTPA-extractable heavy metals(e.g., Ni, Zn, As, Cr, Co, Cu, Hg and Sn) contribute to the poor crop-performance. Additionally, the salinity from river sediment might also affect crop performance.This study shows that environmental safety assessment must be conducted before river and lake sediments can be applied into farming land. |
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