Biodegradation of forest floor organic matter bound to minerals via different binding mechanisms

Mikutta, Robert; Mikutta, Christian; Kalbitz, Karsten; Scheel, Thorsten; Kaiser, Klaus; Jahn, Reinhold

doi:10.1016/j.gca.2007.03.002

Cited by 413 publications

(297 citation statements)

References 61 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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“…At pH values common in acidic soils ($3.5-4.5), their surfaces are largely protonated, and thus feature positive charge. As a result, surface complexation of negatively charged functional groups of OM (e.g., carboxyl and phenolic OH groups) is the predominant binding mechanism (Mikutta et al, 2007). Besides electrostatic attraction and surface complexation (i.e., ligand exchange), OM can interact with mineral surfaces by a variety of other mechanisms (hydrogen bonding, van der Waals interactions, and cation bridging).…”

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confidence: 99%

“…Besides electrostatic attraction and surface complexation (i.e., ligand exchange), OM can interact with mineral surfaces by a variety of other mechanisms (hydrogen bonding, van der Waals interactions, and cation bridging). Ligand exchange appears to be the most efficient in stabilizing OM against microbial decay (Mikutta et al, 2007).…”

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confidence: 99%

“…Phosphate in particular outcompetes OM for sorption sites and even causes desorption of attached OM due to its ability to form strong bonds with oxidic mineral surfaces (Van Hees et al, 2003;Guan et al, 2006). Phosphate can occupy surface hydroxyl sites, which results in less stable mineral-organic associations (Mikutta et al, 2007). Competition effects are more likely at lower SSR because of the limited number of sorption sites; however, such effects are often not considered in experiments utilizing natural OM solutions, which can contain high concentrations of oxyanions.…”

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confidence: 99%

“…Yet, it remains unclear if the observed sorptive stabilization of OM is mainly due to the selective sorption of recalcitrant compounds and/or due to the formation of strong chemical bonds between OM and mineral surfaces (Kalbitz et al, 2005). Although the sorption of OM to soil minerals can result in reduced mineralization of the sorbed fraction (Jones and Edwards, 1998;Kalbitz et al, 2005;Mikutta et al, 2007), the stability of the non-sorbed DOM has not been addressed so far. The sorptive uptake of dissolved OC can range from 1% to 86% (Kaiser et al, 1996), illustrating that the non-sorbed OC can be an important fraction.…”

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confidence: 99%

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Sorptive stabilization of organic matter by amorphous Al hydroxide

Schneider

Scheel

Mikutta

et al. 2010

Geochimica et Cosmochimica Acta

123

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Sorptive stabilization of organic matter by amorphous Al hydroxideSchneider, M.P.W.; Scheel, Th.; Mikutta, R.; van Hees, P.; Kaiser, K.; 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. ) with OM extracted from organic horizons under a Norway spruce and a European beech forest. The stabilization of OM by sorption was analyzed by comparing the CO 2 mineralized during the incubation of sorbed and non-sorbed OM. The mineralization of OM was evaluated based in terms of (i) the availability of the am-Al(OH) 3 , thus surface OM loadings, (ii) spectral properties of OM, and (iii) the presence of phosphate as a competitor for OM. This was done by varying the solid-to-solution ratio (SSR = 0.02-1.2 g L À1 ) during sorption. At low SSRs, hence limited am-Al(OH) 3 availability, only small portions of dissolved OM were sorbed; for OM from Oa horizons, the mineralization of the sorbed fraction exceeded that of the original dissolved OM. The likely reason is competition with phosphate for sorption sites favouring the formation of weak mineral-organic bindings and the surface accumulation of N-rich, less aromatic and less complex OM. This small fraction controlled the mineralization of sorbed OM even at higher SSRs. At higher SSRs, i.e., with am-Al(OH) 3 more available, competition of phosphate decreased and aromatic compounds were sorbed selectively, which resulted in pronounced resistance of sorbed OM against decay. The combined OC mineralization of sorbed and non-sorbed OM was 12-65% less than that of the original DOM. Sorbed OM contributed only little to the overall OC mineralization. Stabilization of OC increased in direct proportion to am-Al(OH) 3 availability, despite constant aromatic C ($30%). The strong stabilization at higher mineral availability is primarily governed by strong Al-OM bonds formed under less competitive conditions. Due to these strong bonds and the resulting strong stabilization, the surface loading, a proxy for the mineral's occupation by OM, was not a factor in the mineralization of sorbed OM over a wide range of C sorption (0.2-1.1 mg C m À2). This study demonstrates that sorption to am-Al(OH) 3 results in stabilization of OM. The mineral availability as well as the inorganic solution chemistry control sorptive interactions, thereby th...

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Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia

Wild

Schnecker

Knoltsch

et al. 2015

Global Biogeochemical Cycles

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112

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Soil N availability is constrained by the breakdown of N-containing polymers such as proteins to oligopeptides and amino acids that can be taken up by plants and microorganisms. Excess N is released from microbial cells as ammonium (N mineralization), which in turn can serve as substrate for nitrification. According to stoichiometric theory, N mineralization and nitrification are expected to increase in relation to protein depolymerization with decreasing N limitation, and thus from higher to lower latitudes and from topsoils to subsoils. To test these hypotheses, we compared gross rates of protein depolymerization, N mineralization and nitrification (determined using 15N pool dilution assays) in organic topsoil, mineral topsoil, and mineral subsoil of seven ecosystems along a latitudinal transect in western Siberia, from tundra (67°N) to steppe (54°N). The investigated ecosystems differed strongly in N transformation rates, with highest protein depolymerization and N mineralization rates in middle and southern taiga. All N transformation rates decreased with soil depth following the decrease in organic matter content. Related to protein depolymerization, N mineralization and nitrification were significantly higher in mineral than in organic horizons, supporting a decrease in microbial N limitation with depth. In contrast, we did not find indications for a decrease in microbial N limitation from arctic to temperate ecosystems along the transect. Our findings thus challenge the perception of ubiquitous N limitation at high latitudes, but suggest a transition from N to C limitation of microorganisms with soil depth, even in high-latitude systems such as tundra and boreal forest.Key Points We compared soil N dynamics of seven ecosystems along a latitudinal transectShifts in N dynamics suggest a decrease in microbial N limitation with depthWe found no decrease in microbial N limitation from arctic to temperate zones

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Biodegradation of forest floor organic matter bound to minerals via different binding mechanisms

Cited by 413 publications

References 61 publications

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

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

Sorptive stabilization of organic matter by amorphous Al hydroxide

Microbial nitrogen dynamics in organic and mineral soil horizons along a latitudinal transect in western Siberia

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