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Title: The relation between biological activity of the rain forest and mineral composition of soils
Authors: Lucas, Yves
Luizão, Flávio Jesus
Chauvel, Armand
Rouiller, James Henri
Nahon, Daniel B.
Keywords: Analytical Geochemistry
Soil Surveys
Tropical Engineering
Geochemical Cycling
Kaolinitic Topsoils
Acid Rain
Element Cycling
Mineral Composition
Rainforest Soil
Soil Biological Activity
Brazil, Amazon Basin
Issue Date: 1993
metadata.dc.publisher.journal: Science
metadata.dc.relation.ispartof: Volume 260, Número 5107, Pags. 521-523
Abstract: In most soils of the humid tropics, kaolinitic topsoil horizons overlie more gibbsitic horizons. This arrangement cannot be produced simply by leaching. Quantitative measurement of the turnover of chemical elements in the litterfall in an Amazonian ecosystem indicates that the forest cycles a significant amount of elements, particularly silicon. As a result, fluids that percolate through topsoil horizons already contain dissolved silicon. This effect keeps silicon from being leached down and may account for the stability of kaolinite in the soil upper horizons. The soil mineral composition is thus maintained by biological activity.
metadata.dc.identifier.doi: 10.1126/science.260.5107.521
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