Heavy metal contamination and ecological risk assessments in the sediments and zoobenthos of selected mangrove ecosystems, South China

Liu, Jinling; Wu, Hao; Feng, Jianxiang; Li, Zhengjie; Lin, Guanghui

doi:10.1016/j.catena.2014.02.009

Cited by 88 publications

(47 citation statements)

References 34 publications

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“…The large and growing extent of human activities in coastal areas has caused or enhanced a variety of environmental problems (Canuto et al 2013;Cui et al 2013;Liu et al 2014). Coastal wetlands are remarkable and are crucial ecosystems in terms of environmental health, ecosystem services function, distinctive geomorphologic features, typical vegetation and faunal associations, and human activities that are related to their singular environment ).…”

Section: Introductionmentioning

confidence: 99%

“…Many previous studies have reported that heavy metal contamination has occurred in river basins or estuaries due to the cause-effect relationship between human effects and the soil quality (Xiao et al 2011;Karim et al 2013). Therefore, it is necessary to investigate distributions and the extent of heavy metal pollution in coastal wetlands and to provide scientific suggestions for coastal management (Chatterjee et al 2009;Liu et al 2014).…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…This may be caused by the microbial decomposition of mangrove letter and oxidation of FeS 2 and FeS (Zhou et al, 2010), and the secretion of root exudates. Different carboxylic acids, strong organic acids, alcohols, carbohydrates and proteins are components of root exudates, especially the range of low-molecular-weight organic acids, which were responsible for increasing bioavailability of metals in sediments near the rhizosphere (Liu et al, 2014). Furthermore, preferential uptake of metals from the soil to the aboveground biomass actively mobilizes the metals and transports them to the crown canopy and the litter layer (Mertens et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

“…The highest contents of Cd, Cr, Fe, Ni and Cu were found in the sediment with the shrub community of A. corniculatum. The reason for these is that heavy metal accumulation in sediments are complicated and often controlled by an array of factors, such as sediment physicochemical characteristics, metal bioavailability, rhizosphere process, mechanism of plant uptakes, the change of land use and pollution sources (Bai et al, 2011;Clemens, 2006;Klavinš et al, 2000;Liu et al, 2014;Remon et al, 2013;Xin et al, 2014). Additionally, the biomass of a plant species plays an important role in the removal of nutrients and heavy metals from mangrove wetlands (Zhang et al, 2010).…”

Section: Resultsmentioning

confidence: 99%

“…Although great efforts have been undertaken to monitor metal pollution level in mangrove swamp in Leizhou Peninsula (Zhang et al, 2006;Zhu et al, 2014), very few studies have considered the extent of heavy metal contamination in sediments with different mangrove vegetation. Several studies showed that mangroves have high capacity to accumulate heavy metals (Liu et al, 2014;MacFarlane et al, 2003;Qiu et al, 2011), while available heavy metals in the sediment could be reintroduced to water or be uptaken by plants (DeWolf and Rashid, 2008;Liu et al, 2014;MacFarlane et al, 2003). To understand the fate of heavy metals in a mangrove swamp, it is important to explore the difference of heavy metals in the sediments with different vegetation cover.…”

Section: Introductionmentioning

confidence: 99%

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Ecological risk assessments and context-dependence analysis of heavy metal contamination in the sediments of mangrove swamp in Leizhou Peninsula, China

Liu

2015

Marine Pollution Bulletin

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Sediments in eight types of mangroves were sampled in the Leizhou Peninsula. Heavy metals were analyzed to investigate the effects on metal distribution of mangrove communities, to evaluate contamination levels, identify sources and relationships between the two. Results showed that mangrove communities have effects on most heavy metal distributions in sediments, especially in the sediment with shrub communities of Aegiceras corniculatum where the contents of many metals are highest. As, Cr and Ni were identified as metal pollutants of primary concern, while Cd was of no concern. Zn, Pb, As mainly originated from anthropogenic source while the other metals are geogenic. Heavy metal distributions were affected by the independent and joint effects of landscape and sediment context; landscape context explains more variations in heavy metals than does sediment physicochemical variables. Total sulfur, total phosphorus and total potassium in sediment, and the existence of paddy field and forest land within 2000 m around the sampling sites are significant variables also.

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Heavy Metal Pollution in Coastal Environment and Its Remediation Using Mangroves

Singh

Yadav

Gupta

et al. 2021

Wetlands Conservation

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Heavy metal contamination and ecological risk assessments in the sediments and zoobenthos of selected mangrove ecosystems, South China

Cited by 88 publications

References 34 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

Ecological risk assessments and context-dependence analysis of heavy metal contamination in the sediments of mangrove swamp in Leizhou Peninsula, China

Heavy Metal Pollution in Coastal Environment and Its Remediation Using Mangroves

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