Modelling Hg mobility in podzols: Role of soil components and environmental implications

Gómez-Armesto, Antía; Cortizas, Antonio Martínez; Ferro-Vázquez, Cruz; Méndez-López, Melissa; Arias‐Estévez, Manuel; Nóvoa-Muñoz, Juan Carlos

doi:10.1016/j.envpol.2020.114040

Cited by 18 publications

(7 citation statements)

References 75 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Richardson et al [24] draw similar conclusions, stating that Hg accumulation in mineral soils is primarily controlled by soil properties. However, the somewhat weak subsoil Hg accumulation indicated that the vertical Hg mobility associated with dissolved organic matter and its stabilization by Al o and Fe o (as described by Gómez-Armesto et al [18]) occurs only to a limited extent. The association with soil texture suggests that Hg contents decreased with increasing particle size, which is in accordance with early observations [14,21].…”

Section: Effect Of Tree Species On the Bioaccumulation Of Hg In Mushrooms And The Related Health Risksmentioning

confidence: 91%

See 1 more Smart Citation

Vertical Distribution of Mercury in Forest Soils and Its Transfer to Edible Mushrooms in Relation to Tree Species

Pecina

Valtera

Trávníčková

et al. 2021

Forests

View full text Add to dashboard Cite

Soil pollution by mercury (Hg) is a global problem that poses risks to natural ecosystems and to human health. Forests represent an important recipient of Hg deposition, however, so far, very little is known about the tree species identity effects on the distribution of Hg in forest soils and its accumulation in edible mushrooms. To clarify the effect on the two main Central-European commercial forest tree species, soil samples were collected from organic F+H horizons and from mineral soil depths of 0–2, 2–10, 10–20, and 20–30 cm in mature Norway spruce (Picea abies (L.) H. Karst.) and European beech (Fagus sylvatica L.) dominated stands. Mushroom samples of the Boletaceae family were also collected at each sampling site. The highest Hg contents were found in the F+H layer and were significantly higher in spruce- (mean 0.46 ± 0.03 mg/kg) than in beech- (mean 0.29 ± 0.10 mg/kg) dominated stands. The variation in Hg contents in F+H was best predicted by pH, the overall lower soil pH in strongly acidic spruce stands might induce Hg immobilization in the F+H layer to cause a decrease in the bioavailability of Hg for Xerocomellus chrysenteron (Bull.) Šutara. In mineral soil, the Hg contents did not differ significantly between the spruce- and beech-dominated stands. The Hg content strongly correlated with the S, N, and C contents only in mineral soil; at the depths of 2–10, 10–20, and 20–30 cm, significantly also with the silt vs. sand, Alo, and Feo contents. Studied mushroom species were not Hg-contaminated and, therefore, their consumption does not pose serious health risks regardless of the forest type. The results suggest that species-related soil chemistry and mineral associations, rather than different atmospheric Hg interception by spruce vs. beech, drive the vertical distribution and accumulation of Hg in forest soils.

show abstract

Section: Effect Of Tree Species On the Bioaccumulation Of Hg In Mushrooms And The Related Health Risksmentioning

confidence: 91%

“…Furthermore, Hg has a high ability to form strong bonds with the sulfur (S) in SOM [16] and to form insoluble HgS [15]. Bonding of Hg with clay particles [17] or with Fe and Al oxyhydroxides [18] are also considered important mechanisms of Hg stabilization in soils.…”

Section: Introductionmentioning

confidence: 99%

Vertical Distribution of Mercury in Forest Soils and Its Transfer to Edible Mushrooms in Relation to Tree Species

Pecina

Valtera

Trávníčková

et al. 2021

Forests

View full text Add to dashboard Cite

show abstract

“…Subsequently, the eigenvector analysis was executed, and the factor loadings were obtained. The obtained factor loadings were then rotated based on the varimax rotation method, which is known to maximize the loading of the variables on the extracted principal components [ 104 ] and also helps to achieve reasonable communalities. This facilitates the interpretation of the resulting principal components.…”

Section: Methodsmentioning

confidence: 99%

Statistical analysis and prediction of spatial resilient modulus of coarse-grained soils for pavement subbase and base layers using MLR, ANN and Ensemble techniques

Ikeagwuani

Nwonu

2022

Innov. Infrastruct. Solut.

View full text Add to dashboard Cite

Prediction methods for the estimation of the resilient modulus( ) of unbound granular materials continues to be fraught with challenges associated with the in situ dependency of the existing methods, which makes them unreliable when considering the spatial variability of soil properties. Moreover, the artificial intelligence methods, which prove to be superior for prediction, indicate that more recent and hybrid machine learning methods are more apt. Consequently, a comparative analysis was executed in the present study using advanced statistical approaches and a simple routine method for the prediction of the of coarse-grained soils used as unbound granular materials in highway pavements. This study considered also the spatial variability of the routine soil properties based on the long-term pavement performance database. The result of the descriptive analysis conducted using principal component analysis revealed that the variation in is due to three principal factors, which include the effect of moisture on the fines content, effect of coarse particles on the compaction characteristics and the effect of the soil stress state. Subsequently, prediction of the using multiple linear regression was unreliable based on residual analysis and multi-collinearity problems. Thus, predictive modeling of was then executed using artificial neural network (ANN) and ensemble techniques (random forest and gradient boosting machine), which resulted in very high R 2 values above 0.9, considered apt for MEPD. The ANN model was found to provide a superior prediction performance than the ensemble techniques.

show abstract

“…Unfortunately, few recent studies have explored the relevance of soil deep horizons in the biogeochemical fate of Hg in soil, as most of them were restricted to the surface soil horizons (Richardson et al, 2018;Schuster et al, 2018;Kroonenberg et al, 2022;Richardson, 2022;Richardson, 2022). In the deepest soils layers, soil components other than C, such as Al and Fe oxyhydroxides or organic Al and Fe compounds, have been recognized to influence the vertical pattern of Hg in soils (Do Valle et al, 2005;Guédron et al, 2006;Navrátil et al, 2014;Richardson et al, 2018;Gómez-Armesto et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Podzols and soils with podzolic characteristics can serve as examples of soils with a recognized ability to accumulate Hg in the deeper soil horizons. In Podzols, Hg can be mobilized through the soil profile together with organic matter and Al and Fe compounds and afterwards immobilized due to its adsorption to metal (Al, Fe)-humus complexes and Al and Fe oxyhydroxides, leading to the characteristic soil vertical pattern of Hg reported in different works (Guédron et al, 2009;Navrátil et al, 2014;Richardson et al, 2018;Gómez-Armesto et al, 2020;Gómez-Armesto et al, 2021a;Gómez-Armesto et al, 2021b).…”

Section: Introductionmentioning

confidence: 99%

Mercury Content and Pools in Complex Polycyclic Soils From a Mountainous Area in Galicia (NW Iberian Peninsula)

et al. 2023

Self Cite

View full text Add to dashboard Cite

Atmospheric mercury (Hg) usually tends to accumulate in the upper horizons of soils. However, the physico-chemical characteristics of some soils, as well as pedogenetic processes, past climate changes, or soil degradation processes, can lead to a redistribution of mercury through the soil profile. In this work, the presence and accumulation of mercury was studied in three deep polycyclic soils from a mountainous area in NW Iberia Peninsula. The highest total Hg values (HgT) were found in the organic matter-rich O and A horizons of FL and MF profiles (169 and 139 μg kg−1, respectively) and in the illuvial horizon of RV (129.2 μg kg−1), with the latter two samples showing the maximum Hg reservoirs (29.3 and 29.0 mg m−2, respectively). Despite finding the highest Hg content in the surface horizons, considerable Hg reservoirs were also observed in depths higher than 40–50 cm, indicating the importance of taking into account these soil layers when Hg pools are evaluated at a global scale. Based on the mass transfer coefficients, we can rule out the contribution of parent material to the Hg accumulation in most of the horizons, thus indicating that pedogenetic processes are responsible for the Hg redistribution observed along the soil profiles. Finally, by means of principal component analysis (PCA) and stepwise linear regression we could assess the main soil components involved in the Hg accumulation in each soil horizon. Therefore, PC1 (organic matter and low stability Al-hummus complexes) showed a higher influence on the surface horizons, whereas PC2 (reactive Al-Fe complexes and medium-high Al-hummus complexes) and PC4 (crystalline Fe compounds and pHw) were more relevant in the Hg distribution observed in the deepest soil layers.

show abstract

Modelling Hg mobility in podzols: Role of soil components and environmental implications

Cited by 18 publications

References 75 publications

Vertical Distribution of Mercury in Forest Soils and Its Transfer to Edible Mushrooms in Relation to Tree Species

Vertical Distribution of Mercury in Forest Soils and Its Transfer to Edible Mushrooms in Relation to Tree Species

Statistical analysis and prediction of spatial resilient modulus of coarse-grained soils for pavement subbase and base layers using MLR, ANN and Ensemble techniques

Mercury Content and Pools in Complex Polycyclic Soils From a Mountainous Area in Galicia (NW Iberian Peninsula)

Contact Info

Product

Resources

About