Effects of Geomorphology on the Distribution of Metal Abundance in Salt Marsh Sediment

Chen, Si; Torres, Raymond

doi:10.1007/s12237-012-9494-y

Cited by 10 publications

(6 citation statements)

References 42 publications

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“…Differences in the topography of riparian zones often result in important differences in hydrological and pedological processes (Du Laing et al, 2009). However, the effect of topography on the distribution and storage of heavy metals in soils has been little described in the literature (Chen and Torres, 2012;Rezapour et al, 2014;Yu et al, 2014). Our results indicated that topographic variables, including elevation and distance from the river mouth, were the main factors affecting the heavy metal concentrations in riparian soils in the Han River, China (Table 3 and 5).…”

Section: Discussionmentioning

confidence: 60%

“…It has been reported that fine particle-related metals, such as Cd, Cr, Cu, Zn and Ni, will accumulate more at lower elevations (Chen and Torres, 2012). In general, low-elevation areas experience longer inundation times during flooding events than high-elevation areas.…”

Section: Discussionmentioning

confidence: 99%

“…Compared with steep areas, flat areas have a longer water residence time and therefore may have a greater capacity to accumulate heavy metals in soils. However, only a few studies have examined the effect of topography on the soil heavy metal concentrations in river ecosystems (e.g., Du Laing et al, 2007;Chen and Torres, 2012). One such study has demonstrated that metal abundances in soils are strongly influenced by elevation and distance from the channel in an estuary (Chen and Torres, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Heavy metal concentrations in riparian soils along the Han River, China: The importance of soil properties, topography and upland land use

Liu

Xiong

Jiang

et al. 2016

Ecological Engineering

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Riparian zones can act as an important sink for various contaminants, including heavy metals. The retention and accumulation of heavy metals in riparian soils varies spatially and is related to many local factors, such as soil properties, topography and land use. However, the relative importance of such factors in determining the heavy metal contamination of riparian soils remains unclear. In this study, we investigated the concentrations of 10 heavy metals (i.e., Ba, Cd, Co, Cr, Cu, Mn, Ni, Pb, Sr and Zn) and their relationships to environmental features in 67 soil samples collected from 26 riparian sites along the Han River, China. Our results showed that there were significant and positive correlations among the concentrations of all heavy metals except for Ba, Mn and Sr. Heavy metal concentrations were, in general, positively associated with conductivity, fine substrate, carbon, nitrogen and phosphorus contents in soils but were negatively related to soil pH and density. Among the topographic conditions studied, elevation and distance from the river mouth were positively associated with the concentrations of Ba, Cd, Cr and Ni in riparian soils. Upland land use had a significant effect on the concentrations of Co, Cu and Zn. Generalized linear models revealed that soil properties, topography and land use together accounted for 11-69% of the variance in single metal concentrations, while redundancy analysis showed that such factors could explain 48% of the variance in overall metal levels. Our findings suggest that heavy metal concentrations in riparian soils are regulated not only by soil properties but also by physical characteristics such as topography and land use.

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Section: Discussionmentioning

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heavy metal concentrations in riparian soils along the Han River, China: The importance of soil properties, topography and upland land use

Liu

Xiong

Jiang

et al. 2016

Ecological Engineering

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“…Field and numerical studies indicate that the primary controls on salt marsh circulation and associated material redistribution include vegetation drag [Leonard and Luther, 1995;Christiansen et al, 2000;Leonard and Reed, 2002;Temmerman et al, 2005] and topography [French and Stoddart, 1992;Lawrence et al, 2004;Torres and Styles, 2007;Chen and Torres, 2012]. However, the detailed bathymetry necessary for assessing the role of very subtle relief on overmarsh circulation is typically not available, and therefore, the role of salt marsh microtopography cannot be fully evaluated.…”

Section: Introductionmentioning

confidence: 99%

Complexity in salt marsh circulation for a semienclosed basin

et al. 2015

Self Cite

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The fine details of overmarsh circulation remain largely unexplored and yet they are typically assumed to control many attributes of salt marsh material cycling, transport, and accretion. We characterized the spatial and temporal variability in overmarsh circulation at a 2 km2 Georgia, USA, salt marsh using field observations, dye tracer, and numerical simulations. The marsh bathymetry was created with a high‐precision Global Positioning System survey that details the geomorphic structure of intertidal creeks and salt marsh platform features greater than about 1 m in width. We assessed flow path dynamics at four spatial scales ranging from 1 m to 1000 m. Results show the development and decay of simultaneous flow divergence and convergence, concentrated flow and large‐scale rotational flow, and strong differences between flood and ebb pathways. This current complexity is set by submergence and emergence of subtle salt marsh platform geomorphic structure, and it highlights the role of topography in system‐wide flow processes.

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“…Natural transport processes of heavy metals mainly depend on the presence and transport of fine-grained sediment, which is an efficient sink for heavy metals, with the capacity to concentrate and retain heavy metals which is related to its unique physical (grain size, surface area, and charge) and chemical (composition, cation exchange capacity) properties (Horowitz and Elrick 1987). Furthermore, the bed morphology, hydrodynamic processes, and vegetation in the wetland also influence heavy metal transport and accumulation (Duarte et al 2010;Zhou et al 2010;Almeida et al 2011;Chen and Torres 2012). In addition, rapid industrialization and economic development are accompanied by severe environmental problems (Fang et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Heavy metal accumulation reflecting natural sedimentary processes and anthropogenic activities in two contrasting coastal wetland ecosystems, eastern China

Gao

et al. 2015

J Soils Sediments

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Purpose Due to the impacts of natural processes and anthropogenic activities, different coastal wetlands are faced with variable patterns of heavy metal contamination. It is important to quantify the contributions of pollutant sources, in order to adopt appropriate protection measures for local ecosystems. The aim of this research was to compare the heavy metal contamination patterns of two contrasting coastal wetlands in eastern China. In addition, the contributions from various metal sources were identified and quantified, and influencing factors, such as the role of the plant Spartina alterniflora, were evaluated. Materials and methods Sediment samples were taken from two coastal wetlands (plain-type tidal flat at the Rudong (RD) wetland vs embayment-type tidal flat at Luoyuan Bay (LY)) to measure the content of Al, Fe, Co, Cr, Cu, Mn, Mo, Ni, Sr, Zn, Pb, Cd, and As. Inductively coupled plasma atomic emission spectrometry, flame atomic absorption spectrometry, and atomic fluorescence spectrometry methods were used for metal detection. Meanwhile, the enrichment factor and geoaccumulation index were applied to assess the pollution level. Principle component analysis and receptor modeling were used to quantify the sources of heavy metals.Results and discussion Marked differences in metal distribution patterns between the two systems were present. Metal contents in LY were higher than those in RD, except for Sr and Mo. The growth status of S. alterniflora influenced metal accumulations in RD, i.e., heavy metals were more easily adsorbed in the sediment in the following sequence: Cu> Cd>Zn>Cr>Al>Pb≥Ni≥Co>Fe>Sr≥Mn>As>Mo as a result of the presence and size of the vegetation. However, this phenomenon was not observed in LY. A higher potential ecological risk was associated with LY, compared with RD, except for Mo. Based on a receptor model output, sedimentary heavy metal contents at RD were jointly influenced by natural sedimentary processes and anthropogenic activities, whereas they were dominated by anthropogenic activities at LY. Conclusions A combination of geochemical analysis and modeling approaches was used to quantify the different types of natural and anthropogenic contributions to heavy metal contamination, which is useful for pollution assessments. The application of this approach reveals that natural and anthropogenic processes have different influences on the delivery and retention of metals at the two contrasting coastal wetlands. In addition, the presence and size of S. alterniflora can influence the level of metal contamination in sedimentary environments.

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Effects of Geomorphology on the Distribution of Metal Abundance in Salt Marsh Sediment

Cited by 10 publications

References 42 publications

Heavy metal concentrations in riparian soils along the Han River, China: The importance of soil properties, topography and upland land use

Heavy metal concentrations in riparian soils along the Han River, China: The importance of soil properties, topography and upland land use

Complexity in salt marsh circulation for a semienclosed basin

Heavy metal accumulation reflecting natural sedimentary processes and anthropogenic activities in two contrasting coastal wetland ecosystems, eastern China

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