The role of soil organic matter and short-range ordered aluminosilicates in controlling the activity of aluminum in soil solutions of volcanic ash soils

Yagasaki, Yasumi; Mulder, Jan; Okazaki, Masanori

doi:10.1016/j.geoderma.2006.07.001

Cited by 20 publications

(20 citation statements)

References 47 publications

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“…5). Similar Al solubility characteristics were reported by Yagasaki et al (2006) for an acidified A horizon initially dominated by allophanic materials. Thus, long-term acidification of allophanic soils leads to a change in the active Al fraction to a dominance by Al-humus complexes and the Al solubility and kinetic characteristics are then controlled by Al-humus complexes.…”

Section: Organic Carbon Accumulation In Andosolssupporting

confidence: 85%

“…can result in a transformation of Al solubility control from allophane/ imogolite-gibbsite control to that of Al-humus complexes (Takahashi et al, 2008;Yagasaki et al, 2006). In these situations, it is considered that Al ions are released from Al-humus complexes as a function of pH resulting in high concentrations of aqueous Al 3+ that are phytotoxic (Inamatsu et al, 1991;Matsuyama et al, 2005;Mitamura, 2005;Morikawa et al, 2002;Saigusa et al, 1988;Takahashi et al, 2008).…”

Section: Aluminum Phytotoxicitymentioning

confidence: 99%

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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 Andosolssupporting

confidence: 85%

Section: Aluminum Phytotoxicitymentioning

confidence: 99%

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

2016

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“…With strong acidification, however, the allophanic Andosols can then possess high amounts of Al KCl (Matsuyama et al 2005;Takahashi et al 2008). The Al solubility of the acidified allophanic soils is close to that of the nonallophanic Andosols and is controlled by the Al-humus complexes Yagasaki et al 2006).…”

Section: Substance Controlling the Toxic Aluminum In Non-allophanic Amentioning

confidence: 98%

“…The Utsunomiya and Yunodai soils, showing an Al toxicity (availability), possessed lower soil pH values, higher Al p values and higher Al p /Al o ratios. These properties are approaching those of the non-allophanic Andosols and acidified allophanic soils in which the Al-humus complexes control the Al solubility of the soils (Takahashi et al 1995;Takahashi et al 2008;Yagasaki et al 2006). Therefore, it is likely that the Al-humus complexes significantly affect the Al toxicity (availability) in the acidic allophanic Andosols as well as non-allophanic Andosols.…”

Section: Substance Controlling the Toxic Aluminum In Non-allophanic Amentioning

confidence: 99%

“…Several researchers reported that the Al solubility of allophanerich Andosols is usually controlled by the dissolution equilibrium of imogolite and gibbsite (Dahlgren et al 1990;Takahashi et al 1995;Yagasaki et al 2006). With strong acidification, however, the allophanic Andosols can then possess high amounts of Al KCl (Matsuyama et al 2005;Takahashi et al 2008).…”

Section: Substance Controlling the Toxic Aluminum In Non-allophanic Amentioning

confidence: 99%

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Inhibitory effect of acid Andosols on plants – is aluminum toxicity true for allophanic Andosols?

Yamada

Itō

Takahashi

et al. 2011

Soil Science and Plant Nutrition

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Non-allophanic Andosols often show aluminum (Al) toxicity to Al-sensitive plant roots. The toxicity was evaluated by the 1 M potassium chloride (KCl)-extractable Al (Al KCl ) content. In contrast, natural allophanic Andosols rarely show any Al toxicity, whereas Al KCl can appear with strong acidification. It is still not clear whether the acidic allophanic soils cause the Al toxicity, or the acid injury in Andosols is totally explained by the Al toxicity. In this study, plant cultivation experiments were performed using non-allophanic and allophanic soils over a wide-range of pH values; two typical non-allophanic soils ), and these concentrations in the buckwheat in the acidic allophanic soils were comparable (2.7-4.0 mg g À1 ) to those in the nonallophanic soils. Thus, it was shown that the acid injury of the Andosols is definitely caused by the Al toxicity, regardless of the type of Andosols, i.e. non-allophanic or allophanic. Possible substances controlling the Al toxicity were discussed in relation to soil properties.

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