Arsenic and heavy metal pollution in wetland soils from tidal freshwater and salt marshes before and after the flow-sediment regulation regime in the Yellow River Delta, China

Bai, Junhong; Xiao, Rong; Zhang, Kejiang; Gao, Haifeng

doi:10.1016/j.jhydrol.2012.05.006

Cited by 219 publications

(116 citation statements)

References 66 publications

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“…In the available literature, Bai et al (2012) applied a geoaccumulation index, correlation analysis, factor analysis, and sediment quality guidelines to compare soil heavy metal concentrations before and after flow-sediment regulation in the tidal freshwater and salt marshes of the Yellow River Delta. The results showed that the concentrations of the heavy metals As and Cd in the marsh soils are much higher after flow-sediment regulation than before .…”

Section: Discussionmentioning

confidence: 99%

“…The contamination index and integrated contamination index show that the mean concentrations of these heavy metals were below the Class I criterion. Bai et al (2012) investigated the characteristics of heavy metal pollution in tidal wetlands before and after the regulation regime. The sediment quality guidelines and geoaccumulation indices showed moderately or strongly polluted As and Cd levels and unpolluted or moderately polluted Cu, Pb, and Zn levels.…”

Section: Initial Eigenvaluesmentioning

confidence: 99%

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Contamination assessment of arsenic and heavy metals in a typical abandoned estuary wetland—a case study of the Yellow River Delta Natural Reserve

Xie

Sun

Zhang

et al. 2014

Environ Monit Assess

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Coastal and estuarine areas are often polluted by heavy metals that result from industrial production and agricultural activities. In this study, we investigated the concentration trait and vertical pattern of trace elements, such as As, Cd, Ni, Zn, Pb, Cu, and Cr, and the relationship between those trace elements and the soil properties in coastal wetlands using 28 profiles that were surveyed across the Diaokouhe Nature Reserve (DKHNR). The goal of this study is to investigate profile distribution characteristics of heavy metals in different wetland types and their variations with the soil depth to assess heavy metal pollution using pollution indices and to identify the pollution sources using multivariate analysis and sediment quality guidelines. Principal component analysis, cluster analysis, and pollution level indices were applied to evaluate the contamination conditions due to wetland degradation. The findings indicated that the concentration of trace elements decreased with the soil depth, while Cd increases with soil depth. The As concentrations in reed swamps and Suaeda heteroptera surface layers were slightly higher than those in other land use types. All six heavy metals, i.e., Ni, Cu, As, Zn, Cr, and Pb, were strongly associated with PC1 (positive loading) and could reflect the contribution of natural geological sources of metals into the coastal sediments. PC2 is highly associated with Cd and could represent anthropogenic sources of metal pollution. Most of the heavy metals exhibited significant positive correlations with total concentrations; however, no significant correlations were observed between them and the soil salt and soil organic carbon. Soil organic carbon exhibited a positive linear relationship with Cu, Pb, and Zn in the first soil layer (0-20 cm); As, Cr, Cu, Ni, Pb, and Zn in the second layer (20-40 cm); and As, Cr, Cu, Ni, Pb, and Zn in the third layer (40-60 cm). Soil organic carbon exhibited only a negative correlation with Cd (P<0.05), in the second and third layers. As, Cr, Cu, Ni, Pb, and Zn exhibited lower geoaccumulation index values (I geo values), which averaged less than 0 in the three soil layers, this finding indicates that the soils have remained unpolluted by these heavy metals. The mean concentrations of these trace elements were lower than Class I criteria. The degradation wetland restoration suggestions have also been provided in such a way as to restore the reserved flow path of the Yellow River. The results that are associated with trace element contamination would be helpful in providing scientific directions to restore wetlands across the world.

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Section: Discussionmentioning

confidence: 99%

Section: Initial Eigenvaluesmentioning

confidence: 99%

Contamination assessment of arsenic and heavy metals in a typical abandoned estuary wetland—a case study of the Yellow River Delta Natural Reserve

Xie

Sun

Zhang

et al. 2014

Environ Monit Assess

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“…In addition, the flow-sediment regulation scheme was implemented from June to July of each year (since 2002) to discharge the water and sediments from the Xiaolangdi Reservoir. Monthly water discharge and sediment loads increased greatly since the regulation was enacted, especially from June to July due to channel scouring in the lower reaches (Bai et al 2012). The variations of water discharge and sediment loads could greatly affect the concentration of heavy metals.…”

Section: Variations Of Heavy Metals In Plants and Sedimentsmentioning

confidence: 99%

“…The variations of water discharge and sediment loads could greatly affect the concentration of heavy metals. Bai et al (2012) implied that the flow-sediment regulation potentially influenced the accumulation of heavy metals in the Yellow River. In this study, the maximums of heavy metal concentration in sediments (especially in MM) were observed in August 9 (Fig.…”

Section: Variations Of Heavy Metals In Plants and Sedimentsmentioning

confidence: 99%

“…Various hydrological processes and sediment physicochemical properties significantly influence the biochemical processes of heavy metals in marshes. There has been intensely increasing interest in understanding the pollution of heavy metals in coastal marsh due to the great influences of human activities (Li et al 2000(Li et al , 2007Caeiro et al 2005;Abrahim and Parker 2008;Bai et al 2011Bai et al , 2012Xiao et al 2013). Exploring heavy metal accumulation in plants for the remediation (or phytoremediation) of coastal environment is of great significance (Chaney et al 1997;Deng et al 2004).…”

Section: Introductionmentioning

confidence: 99%

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Temporal variations and bioaccumulation of heavy metals in different Suaeda salsa marshes of the Yellow River estuary, China

Song

Sun

2014

Environ Sci Pollut Res

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To understand the temporal variations and bioaccumulation of heavy metals in the coastal marshes, the concentrations of heavy metals (Cr, Ni, Pb, and Cu) in the two Suaeda salsa marshes [middle S. salsa marsh (MM) and low S. salsa marsh (LM)] of the Yellow River estuary were determined from May to November in 2008 by in situ sampling and inductively coupled plasma mass spectrometry (ICP-MS) analysis. Results showed that heavy metal concentrations in S. salsa of MM and LM were generally in the order of Cu>Cr>Pb>Ni, while those in sediments fell in the order of Cr>Ni>Cu>Pb. Heavy metal concentrations of S. salsa in MM and LM were different, and significant differences were observed in stems (F = 4.797, p= 0.046) and litters (F=6.799, p=0.026) for Ni. Litter was the main stock of heavy metals, and the allocations of Cr, Ni, and Pb reached 31. .64 % (in LM), respectively. The ratios of roots/ leaves (R/L) and roots/stems (R/S) for Cr and Ni in MM were mostly greater than 1, while those ratios in LM were mostly less than 1, indicating that Cr and Ni in S. salsa at LM had greater mobility compared with those at MM. Moreover, the [accumulation factor, AF] plant of Cr, Ni, Cu, and Pb in LM, especially [AF] root and [AF] stem of Cr and [AF] litter of Ni, was also higher than that in MM. These indicated that S. salsa grown in LM was more suitable for potential biomonitor or phytoremediation of Cr, Ni, Cu, and Pb if intertidal sediments were seriously contaminated with an increase of pollutant loading (especially heavy metals) in the Yellow River estuary. The use of biomonitor (S. salsa) living and growing in LM could yield valuable information not only on the presence of anthropogenic stressors, but, more importantly, on the adverse influence the stressors are having on the environment.

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A Wetland Network Design for Water Allocation Based on Environmental Flow Requirements

Yang

Cui

2012

CLEAN Soil Air Water

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Excessive water use with economic development has led to the shortage of environmental flow requirements (EFRs) for different wetlands in the past years, a number of wetlands become degraded or disappeared. A suitable water allocation used for wetland restoration has become focus in the field. This article presents a wetland network design approach to achieve the objective of water allocation. First, a wetland network was designed by linking linear wetlands (as edges) and patch wetlands (as nodes), the EFRs were then calculated for restoration of wetlands under three scenarios (normal years, dry years, and extremely dry years) defined by annual precipitation; second, the water trade-off between human use and wetland network was determined, and after that water allocation was arranged within the designed wetland network based on certain priorities. Finally, the satisfaction proportion of EFRs, flood-control capacity, and connectivity for the designed wetland network were assessed by two functional indicators and one structural indicator. The results showed that the designed network with three new patch wetlands and water trade-off scenarios made additional water available to wetlands. This additional water amount ranges from 56.1 to 79.4 million m 3 in different scenarios. The three assessment indicators reflect the improved performance of the designed wetland network. This article can promote the understanding of wetland network and serve as water management tool that goes beyond conservation of individual wetland.Abbreviations: EFRs, environmental flow requirements; PDZ, prohibited development zone; RDZ, restricted development zone; SDZ, suitable development zone

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Arsenic and heavy metal pollution in wetland soils from tidal freshwater and salt marshes before and after the flow-sediment regulation regime in the Yellow River Delta, China

Cited by 219 publications

References 66 publications

Contamination assessment of arsenic and heavy metals in a typical abandoned estuary wetland—a case study of the Yellow River Delta Natural Reserve

Contamination assessment of arsenic and heavy metals in a typical abandoned estuary wetland—a case study of the Yellow River Delta Natural Reserve

Temporal variations and bioaccumulation of heavy metals in different Suaeda salsa marshes of the Yellow River estuary, China

A Wetland Network Design for Water Allocation Based on Environmental Flow Requirements

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