Distribution of Al-, Fe- and Mn-pools and their correlation in soils from two acid deposition small catchments in Hunan, China

Abstract

Distribution of Al-, Fe-and Mn-pools was investigated in five forest soil profiles (consisting of four horizons) in each of two Hunan catchments (BLT and LKS) where acid deposition has been considered critical. Al-and Fe-pools were higher in BLT than those in LKS, but Mn-pools much lower in BLT. Mn-pools vary from topsoils to bottom soils, but there are different trends for different Mn speciation. Al-and Fe-pools, except amorphous Fe ox , were positively correlated to contents of soil organic matter (OM) showed by the loss on ignition in the two catchments. Accumulation of Al-and Fe-pools may occur in the area where soil organic matter was enriched (e.g. in top soil and rhizosphere soil). However, no direct correlation is observed between Mn and OM. Acidic atmospheric deposition may affect transforming among speciations of Al-, Fe-and Mn-pools and leaching of soil Al, Fe and Mn through formation of soluble organometal dissolved Al which was potentially toxic, increased. There were significant correlations between Al-pools complexes or change of oxidation-reduction conditions. Mn ex (exchangeable Mn) and Mn ox (amorphous and organic Mn) were highly linearly correlation with soil pH values at LKS but at BLT. Under acid deposition, the availability of the nutrient Fe increased with the amount of dissolved Al, which was potentially toxic, in the two catchments. There are no significant correlations between Al ex (exchangeable Al) and Mn ex , Fe ex (exchangeable Fe) and Mn ex in this work, indicating potentially toxic Mn increase seldom accompanying with Al increase in the two catchments.

Soil iron fractionation and availability at selected landscape positions in a loessial gully region of northwestern China

“…2006; Zhou et al. 2003), we can safely conclude that Ex‐Fe is the most direct source of available Fe in soils, which is in agreement with other findings (Agbenin 2003; Xue et al. 2006; Young et al.…”

“…The results showed that Ex‐Fe was positively related to DTPA‐Fe concentration at P < 0.01. In view of the fact that Ex‐Fe is the most available Fe in soils for plant absorption (Agbenin 2003; Xue et al. 2006; Young et al.…”

Effect of thermal conversion of pig manure and poultry litter on the content and mobility of Mn and Fe in biochars and in soil after their application

“…This theory is confirmed by results of research conducted by Kobierski (2004), where the highest amounts of Mn and Fe forms extracted with DTPA were determined in topsoils. Xue et al (2006) point to the existence of a relationship between Fe and the OM content, while at the same time stressing the possibility that this phenomenon may be intensified as a result of OM accumulation in soil. The cited authors do not, however, point to a connection between OM and Mn ions.…”

“…These elements are used by plants in small amounts (Walna et al, 2010). In the soil environment, Mn and Fe form numerous compounds and their bioavailability is conditioned by soil properties, mainly by the redox potential and pH (Xue et al, 2006). According to Livens (1991), Mn and Fe, which can be found in topsoils, can form complex bonds with OM and remain available for plants in this form.…”

Distribution of heavy metals in the water column, suspended particulate matters and the sediment under hydrodynamic conditions using an annular flume

“…To date, an increasing number of studies (Kelderman and Osman, 2007;Xue et al, 2006) have focused on heavy metal fractions in sediments, which should provide more information about environmental impacts on bioavailability. However, in these investigations, the hydrodynamic conditions were not adequately taken into consideration.…”