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https://repositorio.inpa.gov.br/handle/1/19508
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 Composition Soil Surveys Tropical Engineering Geochemical Cycling Gibbsite Kaolinitic Topsoils Acid Rain Element Cycling Mineral Composition Rainforest Soil Silicon 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 |
Appears in Collections: | Artigos |
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