Sorptive stabilization of organic matter by amorphous Al hydroxide

Schneider, Manfred; Scheel, Thorsten; Mikutta, Robert; Hees, Patrick Van; Kaiser, Klaus; Kalbitz, Karsten

doi:10.1016/j.gca.2009.12.017

Cited by 124 publications

(89 citation statements)

References 42 publications

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“…As previously discussed, Al-humus complexes are assumed to protect soil humus from decomposition by microorganisms and enzymes (Baldock and Broos, 2011;Mikutta et al, 2007;Schneider et al, 2010). However, Takahashi et al (2006a) showed a remarkable decrease of Al p values (7 -52%) following liming of A horizon soils from non-allophanic Andosols in a laboratory study.…”

Section: Organic Carbon Accumulation In Andosolsmentioning

confidence: 93%

Nature, properties and function of aluminum–humus complexes in volcanic soils

2016

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Andosols (or Andisols) possess several distinctive properties that are rarely found in other groups of soils. These properties are largely due to the dominance of short-range-ordered minerals (allophane, imogolite and ferrihydrite) and/or metal-humus complexes (Al/Fe-humus complexes) in their colloidal fraction. While several papers have extensively reviewed the nature and properties of short-range-ordered minerals, there is no comprehensive review of the genesis, characteristics and management implications of Al-humus complexes, the dominant form of active Al in non-allophanic Andosols. In this review, we survey the chemical characteristics of Al-humus complexes and discuss the pedogenic environment favoring their formation in non-allophanic Andosols. The role of Al-humus complexes in carbon cycling and soil organic carbon accumulation is emphasized as an important mechanism controlling organic dynamics in Andosols. While non-allophanic Andosols share many common properties with allophanic Andosols, they display several distinct characteristics associated with Al-humus complexes, such as strong acidity and high exchangeable Al content that impair agricultural productivity due to Al phytotoxicity. Thus, we focus on the role of Al-humus complexes in regulating aqueous Al 3+ solubility and release/retention kinetics, Al phytotoxicity, phosphorus dynamics, and suppression of soil-borne diseases. Knowledge of these soil properties as related to Al-humus complexes is necessary to develop effective soil management practices to assure sustainable agricultural productivity in non-allophanic Andosols. Finally, future research needs are identified concerning the role of Al-humus complexes in regulating soil biogeochemical processes.

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Section: Organic Carbon Accumulation In Andosolsmentioning

confidence: 93%

Nature, properties and function of aluminum–humus complexes in volcanic soils

2016

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“…Fig. 16 directly compares the adsorption of EPS-C to Al(OH) 3(am) with that of OM-C derived from less and well humified organic soil layers (Schneider et al, 2010). The data suggest that EPS from B. subtilis exhibit a similar sorption affinity Molar Al:C = 0.53 Fig.…”

Section: Eps Adsorption Versus Coprecipitationmentioning

confidence: 96%

“…3(am) at different initial molar Al:C ratios. Data for natural OM were taken from Schneider et al (2010). The pH in each experiment was 4.5.…”

Section: Preferential Adsorption and Coprecipitation Of Eps Componentsmentioning

confidence: 99%

Stabilization of extracellular polymeric substances (Bacillus subtilis) by adsorption to and coprecipitation with Al forms

Mikutta

Zang

Chorover

et al. 2011

Geochimica et Cosmochimica Acta

108

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Stabilization of extracellular polymeric substances (Bacillus subtilis) by adsorption to and coprecipitation with Al forms Mikutta, R.; Zang, U.; Chorover, J.; Haumaier, L.; Kalbitz, K. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Abstract Extracellular polymeric substances (EPS) are continuously produced by bacteria during their growth and metabolism. In soils, EPS are bound to cell surfaces, associated with biofilms, or released into solution where they can react with other solutes and soil particle surfaces. If such reaction results in a decrease in EPS bioaccessibility, it may contribute to stabilization of microbial-derived organic carbon (OC) in soil. Here we examined: (i) the chemical fractionation of EPS produced by a common Gram positive soil bacterial strain (Bacillus subtilis) during reaction with dissolved and colloidal Al species and (ii) the resulting stabilization against desorption and microbial decay by the respective coprecipitation (with dissolved Al) and adsorption (with Al(OH) 3(am) ) processes. Coprecipitates and adsorption complexes obtained following EPS-Al reaction as a function of pH and ionic strength were characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The stability of adsorbed and coprecipitated EPS against biodegradation was assessed by mineralization experiments for 1100 h. Up to 60% of the initial 100 mg/L EPS-C was adsorbed at the highest initial molar Al:C ratio (1.86), but this still resulted only in a moderate OC mass fraction in the solid phase (17 mg/g Al(OH) 3(am) ). In contrast, while coprecipitation by Al was less efficient in removing EPS from solution (maximum values of 33% at molar Al:C ratios of 0.1-0.2), the OC mass fraction in the solid product was substantially larger than that in adsorption complexes. Organic P compounds were preferentially bound during both adsorption and coprecipitation. Data are consistent with strong ligand exchange of EPS phosphoryl groups during adsorption to Al(OH) 3(am) , whereas for coprecipitation weaker sorption mechanisms are also involved. X-ray photoelectron analyses indicate an intimate mixing of EPS with Al in the coprecipitates, which is not observed in the case of EPS adsorption complexes. The incubation experiments...

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“…Forest soils contain up to 45 % of carbon (C) stored on land surfaces (Malmsheimer et al 2011) forming an important part of the global C budget (Schlesinger 1997;Hedges et al 2000). Climate change is expected to have significant consequences on forest soils IPCC 2013) and better models are needed to predict current and future soil carbon stocks to help guide in mitigating potential effects that are likely to be associated with climate change.…”

Section: Introductionmentioning

confidence: 99%

Forest soil CO2 efflux models improved by incorporating topographic controls on carbon content and sorption capacity of soils

Lecki

Creed

2016

Biogeochemistry

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Improved models are needed to predict the fate of carbon in forest soils under changing environmental conditions. Within a temperate sugar maple forest, soil CO 2 efflux averaged 3.58 lmol m -2 s -1 but ranged from 0.02 to 25.35 lmol m -2 s -1 . Soil CO 2 efflux models based on temperature and moisture explained approximately the same amount of variance on gentle and steep hillslopes (r 2 = 0.506, p \ 0.05 and r 2 = 0.470, p \ 0.05 respectively). When soil carbon content and sorption capacity were added to the models, the amount of explanation increased slightly on a gentle hillslope (r 2 = 0.567, p \ 0.05) and substantially on a steep hillslope (r 2 = 0.803, p \ 0.05). Within the organic-rich surface of the mineral soil, carbon content was positively related and sorption capacity was negatively related to soil CO 2 efflux rates. There were general patterns of smaller carbon pools and lower sorption capacity in the upland positions than in the lowland and wetland positions, likely a result of hydrological transport of particulate and dissolved substances downslope, leading to higher soil CO 2 efflux in the upland positions. However, the magnitude of the soil CO 2 efflux was mitigated by the higher sorption capacity of the organic-rich surface layer of the mineral soils, which was negatively correlated to soil CO 2 efflux. More accurate estimates of forest soil CO 2 efflux must take into account topographic influences on the carbon pool, the environmental factors that affect rates of carbon transformation, as well as the physicochemical factors that determine the fraction of the carbon pool that can be transformed.

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Sorptive stabilization of organic matter by amorphous Al hydroxide

Cited by 124 publications

References 42 publications

Nature, properties and function of aluminum–humus complexes in volcanic soils

Nature, properties and function of aluminum–humus complexes in volcanic soils

Stabilization of extracellular polymeric substances (Bacillus subtilis) by adsorption to and coprecipitation with Al forms

Forest soil CO2 efflux models improved by incorporating topographic controls on carbon content and sorption capacity of soils

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