Soil Development on Volcanic Materials During the Quaternary

Wada, Kōji; Aomine, Shigenori

doi:10.1097/00010694-197309000-00005

Cited by 59 publications

(17 citation statements)

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“…5 differs from that in Fig. 3 (Wada and Aomine, 1973;Torn et al, 1997;Batjes, 1999). The second step of this study consists to test simultaneously all the variables in the conceptual models in order to assess the potential interactions between them.…”

Section: The Conceptual Model Of Sandy Soilsmentioning

confidence: 66%

“…The resistance of clay-organic matter complexes against microbial activity declines as follows allophane 2:1 clays to 1:1 clays (Sombroek et al, 1993). It is proved that OC content at allophane has a mean residence times comprised between 2000 to 5000 years (Wada and Aomine, 1973). And it is interesting to note that according to Torn et al (1997) and Batjes (1999) the impact of mineralogy on SOC storage has the same importance as that attributed to vegetation or climate.…”

Section: Introductionmentioning

confidence: 97%

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Application of structural equation modeling for assessing relationships between organic carbon and soil properties in semiarid Mediterranean region

Brahim

Breton

Gallali

et al. 2011

Int. J. Environ. Sci. Technol.

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ABSTRACT:Restoration of atmospheric carbon in soils has principal many good effects. Arid lands cover more than 40 % of the global earth area, but only stock 16 % from the global carbon stock. It seems to be a suitable solution for this environmental issue, but still all variables controlling organic carbon in such kinds of soil, was ignored. This study aims to develop two models of organic carbon under clayey and sandy soils in semi-arid Mediterranean zones basing on physical and chemical soil properties. For establishing both models, structural equation modeling was used. For modeling organic carbon, two Tunisian soil databases composed from clayey and sandy soils made respectively, of 450 and 602 soil horizons were used. Using the two databases for all properties, the principal component analysis shows two components for clayey soil; (i) chemical properties and bulk density and (ii) physical properties. For the sandy soil it reveals two components; (i) chemical properties and (ii) physical properties. According to the derived components for each soil category, two models have been built. Structural equation modeling results show that clayey model has proved that organic carbon was controlled by chemical properties and bulk density more than physical properties and sandy model has proved that organic carbon was controlled by chemical properties more than physical properties. The root mean square errors of approximation were 0.079 and 0.050 for the clayey and sandy models, respectively. Then these two models were validated with two other databases from Tunisian dryland soils.

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Section: The Conceptual Model Of Sandy Soilsmentioning

confidence: 66%

Section: Introductionmentioning

confidence: 97%

Application of structural equation modeling for assessing relationships between organic carbon and soil properties in semiarid Mediterranean region

Brahim

Breton

Gallali

et al. 2011

Int. J. Environ. Sci. Technol.

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“…These noncrystalline clays are preferentially preserved in young Andisols and have a short lifespan (Wada & Aomine 1973;Wada 1977). If the soils are more deeply weathered, other days such as illite,montmorillonite, andkaolinite will form 1 Taylor & Pohlen 1970).…”

Section: Discussionmentioning

confidence: 99%

An occurrence of allophane from Mangaturuturu River, Tongariro National Park, North Island, New Zealand

Browne

Soong

1997

New Zealand Journal of Geology and Geophysics

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A white X-ray amorphous material from the Mangaturuturu River, Tongariro National Park, is identified as allophane. The allophane is being precipitated from the cold river water and forms a deposit lining the base and banks of the river. The Mangaturuturu River precipitate is unusual for allophane in that no discrete peaks exist in the X-ray diffraction (XRD) trace. The allophane precipitates from riverine waters which are fed by springs enriched with CO2 that enters the groundwater system from a geothermal source. If the cause for allophane precipitation is geothermally derived CO2, we speculate that precipitation of allophane would increase leading up to and during an active phase of volcanism. The relative abundance of allophane may therefore be a guide to geothermal gas movement within the mountain and, hence, an indicator of geothermal activity of the volcano. This locality is only the second occurrence of allophane reported as a precipitate from riverine waters in New Zealand. The other occurrence at Silica Springs is also in the Tongariro National Park.

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“…The Oxisols from Australia and Brazil were selected to represent material which has been subject to extreme weathering under humid, tropical conditions. The Andosols have formed under similar conditions of intensive leaching in relatively recent deposits of volcanic ash, with clay fractions dominated by allophane (Wada and Aomine, 1973;N.Z. Soil Bureau, 1968).…”

Section: Methodsmentioning

confidence: 99%

“…This evidence might suggest that the former extractant is not as efficient as the latter. On the other hand, the NaOH-soluble fraction also will represent variable dissolution from sources such as imogolite (Wada and Aomine, 1973;Yoshinaga et al, 1973), chloritized 2:1 layer silicates and poorly-ordered kaolinite and halloysite. For these reasons, oxalate values are considered to be the most meaningful of the two in terms of amorphous material as such.…”

Section: Selective Dissolution By Other Reagentsmentioning

confidence: 99%

Properties and Quantitative Estimation of Poorly Crystalline Components in Sesquioxidic Soil Clays

Fey

Roux

1977

Clays and clay miner.

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Abstract--Sesquioxidic soil clays from Oxisols in South Africa, Australia and Brazil, and two clays from Andosols in Japan and New Zealand, were investigated by selective dissolution techniques. Acid ammonium oxalate (pH 3) was found to be superior to currently popular alkaline reagents for extracting amorphous aluminosilicates and alumina from these clays. Boiling 0.5 N NaOH dissolved large amounts of finely-divided kaolinite and halloysite, while hot 5~ Na2CO 3 reaction was too slow (partial dissolution of synthetic amorphous aluminosilicates with one extraction) and insufficiently selective (gibbsite and kaolin of poor crystallinity dissolve to a variable extent). On the other hand, synthetic gels (molar SiO2/A120 ~ ranging from 0.91 to 2.55) dissolved completely after 2 hr shaking in the dark with 0.2 M acid ammonium oxalate (0.2 ml/mg). Specificity of oxalate for natural allophane was indicated by removal of similar quantities of silica and alumina using different clay:solution .ratios. Oxalate extraction data indicated that allophane is absent in Oxisol clays. Allophane was determined quantitatively in volcanic-ash soil clays by allocating hydroxyl water content to oxalate-soluble silica plus alumina on the basis of an ignition weight los~chemical composition function for synthetic amorphous aluminosilicates. Parameters of chemical reactivity and distribution of electric charges following various chemical pretreatments of allophane were found to correspond closely to those predicted on the basis of synthetic gel behaviour. Results for Oxisol clays suggested that the role of amorphous (oxalate-soluble) alumina in governing physicochemical properties is generally less than that of the poorly-crystalline, Al-substituted iron oxide component which is removed by deferration with citrate~tithionite-bicarbonate reagent.

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Soil Development on Volcanic Materials During the Quaternary

Cited by 59 publications

References 0 publications

Application of structural equation modeling for assessing relationships between organic carbon and soil properties in semiarid Mediterranean region

Application of structural equation modeling for assessing relationships between organic carbon and soil properties in semiarid Mediterranean region

An occurrence of allophane from Mangaturuturu River, Tongariro National Park, North Island, New Zealand

Properties and Quantitative Estimation of Poorly Crystalline Components in Sesquioxidic Soil Clays

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