Assessing the heavy metal contamination of soils in the water-level fluctuation zone upstream and downstream of the Manwan Dam, Lancang River

Liu, Shiliang; Wang, Cong; Yang, Juejie; Zhao, Qinghe

doi:10.1007/s11368-014-0855-y

Cited by 24 publications

(13 citation statements)

References 36 publications

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“…Recently, more studies have focused on heavy metal investigations in soils and river sediments (Wu et al 2012;Liu et al 2014;Filho et al 2015) but few on agricultural soils amended with river sediments over an extended period in pain river network region. River sediments contain high levels of organic matter and nutrients and can be utilized to improve soil quality and crop performance (Coelho et al 2011;Wu et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Status of heavy metals in soils following long-term river sediment application in plain river network region, southern China

Zhao

Coles

2015

J Soils Sediments

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Purpose Using river sediments as a soil amendment has hundreds to a thousand years of history in the river plain network region of southern China. This study aimed to investigate the pollution conditions of heavy metals in cultivated soils consistently amended with river sediments for a long term. Materials and methods Soil samples were collected in agricultural fields which were amended with river sediments for a long term. Soil heavy metals (Cr, Ni, Cu, Zn, Pb, Hg, As, and Cd) were determined and then assessed using Nemerow's comprehensive pollution (NCP) and potential ecological risk (PER) indices. A combination of correlation, principal components, and hierarchical cluster analysis was employed to analyze the source of soil heavy metals. Results and discussion Soil Cu, Zn, Ni, Cd, and Cr exceeded the Chinese criterion with excessive Ni levels (719.0 %) in paddy soils and Cu levels (367.8 %) in dryland soils. Soil Cd and Hg had moderate levels of ecological risk. The contamination of soils with heavy metals was graded as heavy by the NCP index or high (paddy soils) and moderate (dryland soils) by the PER index. That is, the soils have accumulated serious levels of heavy metals according to the Chinese assessment criterion. The source of heavy metals in the studied soils is shown to be mainly attributed to anthropogenic activities and environmental effects (e.g., river sediment application, atmospheric deposition). Conclusions Therefore, as a traditional practice for soil amendment, the use of localized river sediments in this region should cease until the quality of the sediments has been assessed.

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Section: Introductionmentioning

confidence: 99%

Status of heavy metals in soils following long-term river sediment application in plain river network region, southern China

Zhao

Coles

2015

J Soils Sediments

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“…The first component, with a variance of 65.03%, was highly correlated with As, Cd, Cu, Pb and Zn. This component could be identified as an "anthropogenic factor" and might originate from a common source due to road traffic [49]. The second component accounted for 17.45% of the total variance with high loadings on Cr and Ni.…”

Section: Source Identification Of Pollutantsmentioning

confidence: 99%

Effects of Landscape Features on the Roadside Soil Heavy Metal Distribution in a Tropical Area in Southwest China

et al. 2021

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Soil heavy metals along roadsides pose a great threat to ecosystems while their spatial variations and influencing factors still remain unclear in some regions, especially in tropical areas with complex landscape characteristics. Our study was carried out to determine how the land use, vegetation characteristics, topographical factors and distance to the road affect the soil heavy metal distribution. Taking Jinghong county in Yunnan Province, Southwest China as a case, soil samples were collected at different distances off roads and canonical correspondence analysis (CCA) methods were used to determine the relative importance of different factors. Our results showed that heavy metal sources were obtained mainly from the road, based on the principle component analysis (PCA) identification. There were no obvious trends of soil quality index (SQI) with distance to the road in natural soils, while SQI nutrients and SQI metals in farmlands had a decreasing and increasing trend, respectively, which could both be expressed by logarithm models. However, soil properties showed little differences for road levels while they showed significant differences under land use types. The CCA further showed that heavy metal variations in natural soils were jointly affected by distance, plant coverage, relative elevation and soil properties in decreasing order.

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“…Dams change a spatial pattern of fluvial sediments exposed to the variation of redox conditions. The change in the ratios of risk elements, i.e., Pb and Zn on one hand and Fe on the other, in littoral areas subjected to regular (seasonal) water-level changes in a dam have recently been described (Liu et al 2014 ). It is probable that prolonged waterlogging near the reservoir shore with a variable level will promote redox-driven processes and enhance mobility in a periodically or permanently inundated littoral zone.…”

Section: Storage Of Heavy Metals In Dam Reservoirsmentioning

confidence: 99%

A Review of Flood-Related Storage and Remobilization of Heavy Metal Pollutants in River Systems

Ciszewski

Grygar

2016

Water Air Soil Pollut

167

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Recently observed rapid climate changes have focused the attention of researchers and river managers on the possible effects of increased flooding frequency on the mobilization and redistribution of historical pollutants within some river systems. This text summarizes regularities in the flood-related transport, channel-to-floodplain transfer, and storage and remobilization of heavy metals, which are the most persistent environmental pollutants in river systems. Metal-dispersal processes are essentially much more variable in alluvia than in soils of non-inundated areas due to the effects of flood-sediment sorting and the mixing of pollutants with grains of different origins in a catchment, resulting in changes of one to two orders of magnitude in metal content over distances of centimetres. Furthermore, metal remobilization can be more intensive in alluvia than in soils as a result of bank erosion, prolonged floodplain inundation associated with reducing conditions alternating with oxygen-driven processes of dry periods and frequent water-table fluctuations, which affect the distribution of metals at low-lying strata. Moreover, metal storage and remobilization are controlled by river channelization, but their influence depends on the period and extent of the engineering works. Generally, artificial structures such as groynes, dams or cut-off channels performed before pollution periods favour the entrapment of polluted sediments, whereas the floodplains of lined river channels that adjust to new, post-channelization hydraulic conditions become a permanent sink for fine polluted sediments, which accumulate solely during overbank flows. Metal mobilization in such floodplains takes place only by slow leaching, and their sediments, which accrete at a moderate rate, are the best archives of the catchment pollution with heavy metals.

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Assessing the heavy metal contamination of soils in the water-level fluctuation zone upstream and downstream of the Manwan Dam, Lancang River

Cited by 24 publications

References 36 publications

Status of heavy metals in soils following long-term river sediment application in plain river network region, southern China

Status of heavy metals in soils following long-term river sediment application in plain river network region, southern China

Effects of Landscape Features on the Roadside Soil Heavy Metal Distribution in a Tropical Area in Southwest China

A Review of Flood-Related Storage and Remobilization of Heavy Metal Pollutants in River Systems

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