A simple model of soil organic matter complexation to predict the solubility of aluminium in acid forest soils

Wesselink, L.G.; Breemen, N. van; Mulder, Jan; Janssen, Peter H.

doi:10.1111/j.1365-2389.1996.tb01411.x

Cited by 78 publications

(50 citation statements)

References 27 publications

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“…Under lower pH conditions, Al is more soluble and available for complexation with soil components (Wesselink et al, 1996). The pH differences between GRASS and both SG-FOR and PINUS were significant for all soil layers, and most probably a result of the acidifying fertilizer applications.…”

Section: Effect Of Soil Ph On Soc Stabilizationmentioning

confidence: 89%

Aggregate and soil organic carbon dynamics in South Chilean Andisols

et al. 2005

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Abstract. Extreme sensitivity of soil organic carbon (SOC) to climate and land use change warrants further research in different terrestrial ecosystems. The aim of this study was to investigate the link between aggregate and SOC dynamics in a chronosequence of three different land uses of a south Chilean Andisol: a second growth Nothofagus obliqua forest (SGFOR), a grassland (GRASS) and a Pinus radiata plantation (PINUS). Total carbon content of the 0-10 cm soil layer was higher for GRASS (6.7 kg C m −2 ) than for PINUS (4.3 kg C m −2 ), while TC content of SG-FOR (5.8 kg C m −2 ) was not significantly different from either one. High extractable oxalate and pyrophosphate Al concentrations (varying from 20.3-24.4 g kg −1 , and 3.9-11.1 g kg −1 , respectively) were found in all sites. In this study, SOC and aggregate dynamics were studied using size and density fractionation experiments of the SOC, δ 13 C and total carbon analysis of the different SOC fractions, and C mineralization experiments. The results showed that electrostatic sorption between and among amorphous Al components and clay minerals is mainly responsible for the formation of metal-humus-clay complexes and the stabilization of soil aggregates. The process of ligand exchange between SOC and Al would be of minor importance resulting in the absence of aggregate hierarchy in this soil type. Whole soil C mineralization rate constants were highest for SGFOR and PINUS, followed by GRASS (respectively 0.495, 0.266 and 0.196 g CO 2 -C m −2 d −1 for the top soil layer). In contrast, incubation experiments of isolated macro organic matter fractions gave opposite results, showing that the recalcitrance of the SOC decreased in another order: PINUS>SGFOR>GRASS. We deduced that electrostatic sorption processes and physical protection of SOC in soil aggregates were the main processes determining SOC stabilization. As a result, high aggregate carbon concentraCorrespondence to: D. Huygens (dries.huygens@ugent.be) tions, varying from 148 till 48 g kg −1 , were encountered for all land use sites. Al availability and electrostatic charges are dependent on pH, resulting in an important influence of soil pH on aggregate stability. Recalcitrance of the SOC did not appear to largely affect SOC stabilization. Statistical correlations between extractable amorphous Al contents, aggregate stability and C mineralization rate constants were encountered, supporting this hypothesis. Land use changes affected SOC dynamics and aggregate stability by modifying soil pH (and thus electrostatic charges and available Al content), root SOC input and management practices (such as ploughing and accompanying drying of the soil).

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Section: Effect Of Soil Ph On Soc Stabilizationmentioning

confidence: 89%

Aggregate and soil organic carbon dynamics in South Chilean Andisols

et al. 2005

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“…Fast flows through porous surface soil horizons where more Al is bound to organic material generally yield low pH water and undersaturated Al conditions (Hendershot et al, 1996). Aluminum bound to organic material in soils is likely rapidly available, whereas Al in inorganic form may be kinetically constrained, but can resupply Al to the organic pool (Wesselink et al, 1996;Figure 2). Carbon dioxide dissolved in soil water can transport Al: once the groundwater reaches water in equilibrium with air, CO 2 degases leaving Al behind (Driscoll and Postek, 1996).…”

Section: Aqueous Geochemistrymentioning

confidence: 99%

“…Once in aqueous solution, Al speciation is further determined by equilibria with organic compounds, mineral surfaces, and other inorganic complexes (Figure 2). Still, overall solubility is primarily under control of the dissolution and precipitation of solid phases, rather than these more subtle speciation or "exchangeable" Al reactions (Driscoll and Postek, 1996;Lindsay and Walthall, 1996; but see Wesselink et al, 1996).…”

Section: Sediment Geochemistry and Wetlandsmentioning

confidence: 99%

The Bioavailability and Toxicity of Aluminum in Aquatic Environments

Gensemer

Playle

1999

Critical Reviews in Environmental Science and Technology

642

444

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ABSTRACT:In this article we review the biological effects of Al, primarily with respect to the chemical factors controlling Al bioavailability and toxicity, and how its biological effects are best predicted. Our intent is not to duplicate recent reviews on Al chemistry or toxicity, but rather to update the literature since these reviews were published, and to focus on Al speciation and other external chemical influences on Al bioavailability to freshwater biota. Briefly, we first review Al chemistry, with a specific focus on understanding, as well as measuring, Al chemical species of importance to aquatic biota. Next we more comprehensively review Al toxicity and bioavailability to freshwater algae, with a thorough analysis of the relationships between speciation and toxicity, the role of important chemical complexing agents such as P, Si, and organic carbon, as well as the potential for Al to impact algal community structure. A third section reviews the more sparse literature on aquatic higher plants; the fourth section reviews a somewhat more abundant literature of Al toxicity to freshwater invertebrates. We close with an updated review of Al toxicity to fish, again with a focus on mechanisms of toxicity, and the role of Al speciation in controlling bioavailability.

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“…Furthermore, the pH in the soil extracts of the batch experiment was lower than in field-soil water. Studies have suggested that model performances are better at pH values <4.3 (Wesselink et al 1996). Coefficients in the linear regression equations of the SOM-Al model vary significantly among the results reported by different investigators (Table 4).…”

Section: Possible Processes Controlling Aluminium Activitymentioning

confidence: 90%

Aluminium Mobilization from Acidic Forest Soils in Leigongshan Area, Southwestern China: Laboratory and Field Study

Guo

Vogt

Zhang

et al. 2006

Arch Environ Contam Toxicol

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Abstract. Aluminium mobilization from acidic forest soils in the remote Leigongshan area in southwestern China was investigated in the field and by a laboratory batch experiment using sequential extractions with HCl solutions with pH of approximately 3.4. Experimental data showed that strongly organically bound aluminium (Alp-Alcu) decreased significantly after sequential extraction, whereas exchangeable aluminium (Alex) increased in all three horizons. In the A-horizon with higher base saturation (BS), dissolved aluminium exchanged with base cations (BCs) on soil complex, causing lower aluminium release but significant leaching of BCs. In AB-and B-horizon with lower BS, more dissolved aluminium remained in solution. Al 3+ activities in both experimental soil extracts and field soil waters strongly deviated from those predicted by the gibbsite model (i.e., pAl = pKsp + 3.0 pH) despite a significant increase in Al 3+ with a decrease in pH. The soil organic-bound aluminium model, using Alcu and Alp to account for differences in the size of available Al pools in the soil, gave considerably better fits to both experimental and field data. SOM-Al model, approved by using Alex instead of organically bound aluminium (i.e., Alp and Alcu), could depict the changes in Al activities most successfully. We have concluded that Alp-Alcu is the main source of aqueous aluminium, whereas Alex plays an important role in regulating aluminium solubility during soil acidification.

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A simple model of soil organic matter complexation to predict the solubility of aluminium in acid forest soils

Cited by 78 publications

References 27 publications

Aggregate and soil organic carbon dynamics in South Chilean Andisols

Aggregate and soil organic carbon dynamics in South Chilean Andisols

The Bioavailability and Toxicity of Aluminum in Aquatic Environments

Aluminium Mobilization from Acidic Forest Soils in Leigongshan Area, Southwestern China: Laboratory and Field Study

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