Characteristics of non-allophanic andisols derived from low-activity clay regoliths in the Nilgiri Hills (Southern India)
Low-activity clay soils on old planation surfaces of the tropics are generally considered as stable end points of soil formation. It is therefore surprising to find Andisols on them. We characterized the properties of six profiles representative of these soils in the western part of the Nilgiri Hills (2000-2500 m above mean sea level), Southern India, where the present climatic conditions are cool (mean annual temperature 15°C) and humid (mean annual rainfall 2500 mm). Thick (50-80 cm) dark-reddish brown topsoil overlies strongly desilicated yellowish-red materials. This horizon has andic properties to a sufficient depth and the carbon content requirement of the melanic epipedon to place these soils in the Andisol order. Our data as well as the history of the Nilgiri Hills suggest that the formation of these nonallophanic Andisols resulted from the succession of two main steps. First, a 'lateritic' weathering cycle led to the relative accumulation of secondary AI and Fe oxides. Later, the accumulation of organic matter favoured by a more recent climatic change induced complexation by organic acids of AI and Fe oxides, and the production of enough metal-humus complexes to give rise to andic properties. Such soils, in which secondary AI and Fe oxides, generally considered as indicators of an advanced weathering stage, are involved in a new cycle of soil formation, are original Andisols.
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Subjects: | P32 - Classification des sols et pédogenèse, Andosol, pédogénèse, trait morphologique du sol, propriété physicochimique du sol, http://aims.fao.org/aos/agrovoc/c_404, http://aims.fao.org/aos/agrovoc/c_7173, http://aims.fao.org/aos/agrovoc/c_7179, http://aims.fao.org/aos/agrovoc/c_7182, http://aims.fao.org/aos/agrovoc/c_3825, |
Online Access: | http://agritrop.cirad.fr/476409/ http://agritrop.cirad.fr/476409/1/476409.pdf |
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dig-cirad-fr-4764092024-01-28T08:33:04Z http://agritrop.cirad.fr/476409/ http://agritrop.cirad.fr/476409/ Characteristics of non-allophanic andisols derived from low-activity clay regoliths in the Nilgiri Hills (Southern India). Caner L., Bourgeon Gérard, Toutain François, Herbillon Adrien-Jules. 2000. European Journal of Soil Science, 51 (4) : 553-563.https://doi.org/10.1111/j.1365-2389.2000.00344.x <https://doi.org/10.1111/j.1365-2389.2000.00344.x> Characteristics of non-allophanic andisols derived from low-activity clay regoliths in the Nilgiri Hills (Southern India) Caner, L. Bourgeon, Gérard Toutain, François Herbillon, Adrien-Jules eng 2000 European Journal of Soil Science P32 - Classification des sols et pédogenèse Andosol pédogénèse trait morphologique du sol propriété physicochimique du sol http://aims.fao.org/aos/agrovoc/c_404 http://aims.fao.org/aos/agrovoc/c_7173 http://aims.fao.org/aos/agrovoc/c_7179 http://aims.fao.org/aos/agrovoc/c_7182 Inde http://aims.fao.org/aos/agrovoc/c_3825 Low-activity clay soils on old planation surfaces of the tropics are generally considered as stable end points of soil formation. It is therefore surprising to find Andisols on them. We characterized the properties of six profiles representative of these soils in the western part of the Nilgiri Hills (2000-2500 m above mean sea level), Southern India, where the present climatic conditions are cool (mean annual temperature 15°C) and humid (mean annual rainfall 2500 mm). Thick (50-80 cm) dark-reddish brown topsoil overlies strongly desilicated yellowish-red materials. This horizon has andic properties to a sufficient depth and the carbon content requirement of the melanic epipedon to place these soils in the Andisol order. Our data as well as the history of the Nilgiri Hills suggest that the formation of these nonallophanic Andisols resulted from the succession of two main steps. First, a 'lateritic' weathering cycle led to the relative accumulation of secondary AI and Fe oxides. Later, the accumulation of organic matter favoured by a more recent climatic change induced complexation by organic acids of AI and Fe oxides, and the production of enough metal-humus complexes to give rise to andic properties. Such soils, in which secondary AI and Fe oxides, generally considered as indicators of an advanced weathering stage, are involved in a new cycle of soil formation, are original Andisols. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/476409/1/476409.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1111/j.1365-2389.2000.00344.x 10.1111/j.1365-2389.2000.00344.x http://catalogue-bibliotheques.cirad.fr/cgi-bin/koha/opac-detail.pl?biblionumber=162251 info:eu-repo/semantics/altIdentifier/doi/10.1111/j.1365-2389.2000.00344.x info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1111/j.1365-2389.2000.00344.x |
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P32 - Classification des sols et pédogenèse Andosol pédogénèse trait morphologique du sol propriété physicochimique du sol http://aims.fao.org/aos/agrovoc/c_404 http://aims.fao.org/aos/agrovoc/c_7173 http://aims.fao.org/aos/agrovoc/c_7179 http://aims.fao.org/aos/agrovoc/c_7182 http://aims.fao.org/aos/agrovoc/c_3825 P32 - Classification des sols et pédogenèse Andosol pédogénèse trait morphologique du sol propriété physicochimique du sol http://aims.fao.org/aos/agrovoc/c_404 http://aims.fao.org/aos/agrovoc/c_7173 http://aims.fao.org/aos/agrovoc/c_7179 http://aims.fao.org/aos/agrovoc/c_7182 http://aims.fao.org/aos/agrovoc/c_3825 |
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P32 - Classification des sols et pédogenèse Andosol pédogénèse trait morphologique du sol propriété physicochimique du sol http://aims.fao.org/aos/agrovoc/c_404 http://aims.fao.org/aos/agrovoc/c_7173 http://aims.fao.org/aos/agrovoc/c_7179 http://aims.fao.org/aos/agrovoc/c_7182 http://aims.fao.org/aos/agrovoc/c_3825 P32 - Classification des sols et pédogenèse Andosol pédogénèse trait morphologique du sol propriété physicochimique du sol http://aims.fao.org/aos/agrovoc/c_404 http://aims.fao.org/aos/agrovoc/c_7173 http://aims.fao.org/aos/agrovoc/c_7179 http://aims.fao.org/aos/agrovoc/c_7182 http://aims.fao.org/aos/agrovoc/c_3825 Caner, L. Bourgeon, Gérard Toutain, François Herbillon, Adrien-Jules Characteristics of non-allophanic andisols derived from low-activity clay regoliths in the Nilgiri Hills (Southern India) |
description |
Low-activity clay soils on old planation surfaces of the tropics are generally considered as stable end points of soil formation. It is therefore surprising to find Andisols on them. We characterized the properties of six profiles representative of these soils in the western part of the Nilgiri Hills (2000-2500 m above mean sea level), Southern India, where the present climatic conditions are cool (mean annual temperature 15°C) and humid (mean annual rainfall 2500 mm). Thick (50-80 cm) dark-reddish brown topsoil overlies strongly desilicated yellowish-red materials. This horizon has andic properties to a sufficient depth and the carbon content requirement of the melanic epipedon to place these soils in the Andisol order. Our data as well as the history of the Nilgiri Hills suggest that the formation of these nonallophanic Andisols resulted from the succession of two main steps. First, a 'lateritic' weathering cycle led to the relative accumulation of secondary AI and Fe oxides. Later, the accumulation of organic matter favoured by a more recent climatic change induced complexation by organic acids of AI and Fe oxides, and the production of enough metal-humus complexes to give rise to andic properties. Such soils, in which secondary AI and Fe oxides, generally considered as indicators of an advanced weathering stage, are involved in a new cycle of soil formation, are original Andisols. |
format |
article |
topic_facet |
P32 - Classification des sols et pédogenèse Andosol pédogénèse trait morphologique du sol propriété physicochimique du sol http://aims.fao.org/aos/agrovoc/c_404 http://aims.fao.org/aos/agrovoc/c_7173 http://aims.fao.org/aos/agrovoc/c_7179 http://aims.fao.org/aos/agrovoc/c_7182 http://aims.fao.org/aos/agrovoc/c_3825 |
author |
Caner, L. Bourgeon, Gérard Toutain, François Herbillon, Adrien-Jules |
author_facet |
Caner, L. Bourgeon, Gérard Toutain, François Herbillon, Adrien-Jules |
author_sort |
Caner, L. |
title |
Characteristics of non-allophanic andisols derived from low-activity clay regoliths in the Nilgiri Hills (Southern India) |
title_short |
Characteristics of non-allophanic andisols derived from low-activity clay regoliths in the Nilgiri Hills (Southern India) |
title_full |
Characteristics of non-allophanic andisols derived from low-activity clay regoliths in the Nilgiri Hills (Southern India) |
title_fullStr |
Characteristics of non-allophanic andisols derived from low-activity clay regoliths in the Nilgiri Hills (Southern India) |
title_full_unstemmed |
Characteristics of non-allophanic andisols derived from low-activity clay regoliths in the Nilgiri Hills (Southern India) |
title_sort |
characteristics of non-allophanic andisols derived from low-activity clay regoliths in the nilgiri hills (southern india) |
url |
http://agritrop.cirad.fr/476409/ http://agritrop.cirad.fr/476409/1/476409.pdf |
work_keys_str_mv |
AT canerl characteristicsofnonallophanicandisolsderivedfromlowactivityclayregolithsinthenilgirihillssouthernindia AT bourgeongerard characteristicsofnonallophanicandisolsderivedfromlowactivityclayregolithsinthenilgirihillssouthernindia AT toutainfrancois characteristicsofnonallophanicandisolsderivedfromlowactivityclayregolithsinthenilgirihillssouthernindia AT herbillonadrienjules characteristicsofnonallophanicandisolsderivedfromlowactivityclayregolithsinthenilgirihillssouthernindia |
_version_ |
1792494735708913664 |