Effects of tephra addition on soil processes in Spodosols in the Cascade Range, Washington, U.S.A.

Dahlgren, Randy A.; Ugolini, F. C.

doi:10.1016/0016-7061(89)90015-3

Cited by 25 publications

(9 citation statements)

References 20 publications

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“…in EUR6‐Pico): greater ionic concentrations in the soil solution increase the concentration of chemical species at the glass surface and decrease the diffusion gradient within the glass. Dahlgren & Ugolini (1989) showed that the leaching potential is negatively correlated with the thickness of ash layers and controls the weathering rate, as the solute concentration increases and mass transfer of weathering products decreases. Therefore the rate of weathering will be limited in the upper horizons of EUR5‐Faial, which are buried beneath a rather thick pumice horizon (> 20 cm).…”

Section: Resultsmentioning

confidence: 99%

Weathering and allophane neoformation in soils developed on volcanic ash in the Azores

Gérard

Caquineau

Pinheiro

et al. 2007

European J Soil Science

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On Faial and Pico islands (Azores), we studied two profiles on basaltic pyroclasts that contain buried horizons, and we focussed on petrography, micropedology and mineralogy. Emphasis was given to weathering of the lapilli and ashes, and the neoformation of allophane. A combination of optical studies, in situ chemical analyses, X-ray diffraction and infrared spectroscopy of clay fractions revealed that allophane is present both in the micromass of the groundmass, in alteromorphs after lapilli or pumice, and in clay coatings. Whereas most studies describe allophane as a colloidal fraction formed by the congruent and total dissolution of the ashes, this study shows evidence for the formation of allophane alteromorphs, due to leaching of Si and cations, with preservation of the original shapes of the tephra. The allophane alteromorphs often display optical characteristics that resemble those of palagonite. Increasing alteration is observed through three steps: (i) hydration of the glass associated with strong cation and Si leaching, (ii) allophane hypocoatings, and (iii) allophane alteromorphs with development of intragrain bridges. The chemical signature of the alteromorphs varies from a pure alumino-silicate at one extreme to an Fe(Ti) enriched alumino-silicate at the other. Between those two extremes, the colour grades from yellow to dark orange, with microzonations. An Al-rich allophane composition is associated with gibbsite in the EUR6-Pico profile, whereas at the base of the EUR5-Faial profile, Si-rich allophane is associated with halloysite. Some variations of the palaeo-environment are also suggested by strong iron segregation observed with various secondary phases (ferrihydrite, haematite, iddingsite).

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Section: Resultsmentioning

confidence: 99%

Weathering and allophane neoformation in soils developed on volcanic ash in the Azores

Gérard

Caquineau

Pinheiro

et al. 2007

European J Soil Science

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“…Volcanic ash has strong eff ects on the mineralogical, chemical, and physical properties of soils (Shoji et al, 1993;Dahlgren et al, 2004). Dahlgren and Ugolini (1989) studied the eff ects of tephra addition at the 5-or 15-cm depth on soil processes in Spodosols in the Cascade Range, in the state of Washington, by collecting soil solution from the major genetic horizons of the tephra-treated profi les. Th ey found soluble salts, composed of base cations (Ca = Na > Mg > K) and SO 4 , that were initially leached from the tephra.…”

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confidence: 99%

Mineralogy, Chemical Composition, and Dissolution of Fresh Ash Eruption: New Potential Source of Nutrients

Anda

Sarwani

2012

Soil Science Society of America Journal

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All rights reserved. No part of this periodical may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or any information storage and retrieval system, without permission in writing from the publisher. Permission for printing and for reprinting the material contained herein has been obtained by the publisher. Mineralogy, Chemical Composition, and Dissolution of Fresh Ash Eruption: New Potential Source of Nutrients Soil MinerologyT he Merapi stratovolcano, with a height of 2965 m above sea level, is located 30 km to the north of Yogyakarta, central Java, Indonesia. It has had more than 81 historical eruptions since the 16th century (Voight et al., 2000) and is known as the most dangerous volcano, with a history of deadly eruption, in Indonesia. Th e Merapi volcano has erupted many times during the last century

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“…The Si production in the soil is mainly from pedogenic Si and BSi, resulting from soil mineral dissolution, and plant tissues and testate amoebae degradation, respectively (Cornelis et al, 2011;Sommer et al, 2013;Puppe et al, 2015). The immobilization (sink) of DSi in the soil is due to plant and organism accumulation and to the precipitation of secondary minerals, such as phyllosilicates or Si-bearing short-range organization minerals or allophane, immogolite (Dahlgren and Ugolini, 1989;Ma and Yamaji, 2006;Sommer et al, 2013;Tubana et al, 2016;Kabata-Pendias and Mukherjee, 2007).…”

Section: Si Budget and Origin In Soilmentioning

confidence: 99%

Contribution of fine tree roots to the silicon cycle in a temperate forest ecosystem developed on three soil types

Turpault

Calvaruso²,

Kirchen

et al. 2018

Biogeosciences

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Abstract. The role of forest vegetation in the silicon (Si) cycle has been widely examined. However, to date, little is known about the specific role of fine roots. The main objective of our study was to assess the influence of fine roots on the Si cycle in a temperate forest in north-eastern France. Silicon pools and fluxes in vegetal solid and solution phases were quantified within each ecosystem compartment, i.e. in the atmosphere, above-ground and below-ground tree tissues, forest floor and different soil layers, on three plots, each with different soil types, i.e. Dystric Cambisol (DC), Eutric Cambisol (EC) and Rendzic Leptosol (RL). In this study, we took advantage of a natural soil gradient, from shallow calcic soil to deep moderately acidic soil, with similar climates, atmospheric depositions, species compositions and management. Soil solutions were measured monthly for 4 years to study the seasonal dynamics of Si fluxes. A budget of dissolved Si (DSi) was also determined for the forest floor and soil layers. Our study highlighted the major role of fine roots in the Si cycle in forest ecosystems for all soil types. Due to the abundance of fine roots mainly in the superficial soil layers, their high Si concentration (equivalent to that of leaves and 2 orders higher than that of coarse roots) and their rapid turnover rate (approximately 1 year), the mean annual Si fluxes in fine roots in the three plots were 68 and 110 kgha-1yr-1 for the RL and the DC, respectively. The turnover rates of fine roots and leaves were approximately 71 and 28 % of the total Si taken up by trees each year, demonstrating the importance of biological recycling in the Si cycle in forests. Less than 1 % of the Si taken up by trees each year accumulated in the perennial tissues. This study also demonstrated the influence of soil type on the concentration of Si in the annual tissues and therefore on the Si fluxes in forests. The concentrations of Si in leaves and fine roots were approximately 1.5–2.0 times higher in the Si-rich DC compared to the Si-poor RL. In terms of the DSi budget, DSi production was large in the three plots in the forest floor (9.9 to 12.7 kgha-1yr-1), as well as in the superficial soil layer (5.3 to 14.5 kgha-1yr-1), and decreased with soil depth. An immobilization of DSi was even observed at 90 cm depth in plot DC (−1.7 kgha-1yr-1). The amount of Si leached from the soil profile was relatively low compared to the annual uptake by trees (13 % in plot DC to 29 % in plot RL). The monthly measurements demonstrated that the seasonal dynamics of the DSi budget were mainly linked to biological activity. Notably, the peak of dissolved Si production in the superficial soil layer occurred during winter and probably resulted from fine-root decomposition. Our study reveals that biological processes, particularly those involving fine roots, play a predominant role in the Si cycle in temperate forest ecosystems, while the geochemical processes appear to be limited.

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Effects of tephra addition on soil processes in Spodosols in the Cascade Range, Washington, U.S.A.

Cited by 25 publications

References 20 publications

Weathering and allophane neoformation in soils developed on volcanic ash in the Azores

Weathering and allophane neoformation in soils developed on volcanic ash in the Azores

Mineralogy, Chemical Composition, and Dissolution of Fresh Ash Eruption: New Potential Source of Nutrients

Contribution of fine tree roots to the silicon cycle in a temperate forest ecosystem developed on three soil types

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