Consequences of clearing and tillage on the soil of a natural Amazonian ecosystem
Identifieur interne : 00DA02 ( Main/Exploration ); précédent : 00DA01; suivant : 00DA03Consequences of clearing and tillage on the soil of a natural Amazonian ecosystem
Auteurs : Paulo F. Da S. Martins [Brésil] ; C. C. Cerri [Brésil] ; B. Volkoff [Cameroun] ; F. Andreux [France] ; A. Chauvel [Brésil]Source :
- Forest Ecology and Management [ 0378-1127 ] ; 1991.
English descriptors
- Teeft :
- Acta amazon, Amaz6nia, Amazon, Amazonia, Annual crops, Base saturation, Bulk density, Cation exchange capacity, Cerri, Chauvel, Chemical properties, Clay content, Clay mineral dispersion, Clay mineral particles, Consequencesof clearingand tillageon, Degradation features, Eastern amazonia, Ecosystem, Editora paulo, Electrophoretic mobility, Exchangeable bases, Flocculation degree, Floresta, Floresta localizado, Fulvic, Fulvic acids, Humic acids, Martins cerri, Mat6ria orgfinica, Native forest, Native forest soil, Natural vegetation, Neighbouring sites, Organic carbon distribution, Organic matter, Organic residues, Queiroz neto, Secondary vegetation, Soil degradation, Soil profile, Soil profiles, Soilof amazonia, Textural heterogeneity, Total porosity, Total soil carbon, Traditional agriculture, Vegetation.
Abstract
Abstract: A comparative study was performed in the Oriental Amazon region of Brazil, on an experimental area of yellow latosol and red-yellow podzolic soils. Taking the forest soil as a reference, the chemical, physical, and micromorphological changes occurring after sequential burning, tillage and fallow-land were studied. Deforestation and tillage were responsible for a decreasing content and qualitative changes in organic matter; fulvic acid content first increased, then humic acid content decreased, giving rise to an increasing destruction of clay/organic complexes in the A horizon. As a result, a greater dispersion and migration of fine particles occurred, causing the obstruction of macropores and an increase in bulk density. Crop production decreased in two years, and the soil had to be abandoned. A secondary vegetation developed, and yielded organic residues which stimulated faunal activity. After three years under fallow, the above observed soil degradation processes were partially reversed.
Url:
DOI: 10.1016/0378-1127(91)90148-O
Affiliations:
- Brésil, Cameroun, France
- Amazonas (Brésil), Pará, État de São Paulo
- São Paulo
- Université de São Paulo
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Chauvel</name><affiliation wicri:level="2"><country xml:lang="fr">Brésil</country><wicri:regionArea>ORSTOM and Instituto Nacional de Pesquisa Amazónica (INPA), CP 478 Manaus, AM</wicri:regionArea><placeName><region type="state">Amazonas (Brésil)</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Forest Ecology and Management</title><title level="j" type="abbrev">FORECO</title><idno type="ISSN">0378-1127</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1991">1991</date><biblScope unit="volume">38</biblScope><biblScope unit="issue">3–4</biblScope><biblScope unit="page" from="273">273</biblScope><biblScope unit="page" to="282">282</biblScope></imprint><idno type="ISSN">0378-1127</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0378-1127</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="Teeft" xml:lang="en"><term>Acta amazon</term><term>Amaz6nia</term><term>Amazon</term><term>Amazonia</term><term>Annual crops</term><term>Base saturation</term><term>Bulk density</term><term>Cation exchange capacity</term><term>Cerri</term><term>Chauvel</term><term>Chemical properties</term><term>Clay content</term><term>Clay mineral dispersion</term><term>Clay mineral particles</term><term>Consequencesof clearingand tillageon</term><term>Degradation features</term><term>Eastern amazonia</term><term>Ecosystem</term><term>Editora paulo</term><term>Electrophoretic mobility</term><term>Exchangeable bases</term><term>Flocculation degree</term><term>Floresta</term><term>Floresta localizado</term><term>Fulvic</term><term>Fulvic acids</term><term>Humic acids</term><term>Martins cerri</term><term>Mat6ria orgfinica</term><term>Native forest</term><term>Native forest soil</term><term>Natural vegetation</term><term>Neighbouring sites</term><term>Organic carbon distribution</term><term>Organic matter</term><term>Organic residues</term><term>Queiroz neto</term><term>Secondary vegetation</term><term>Soil degradation</term><term>Soil profile</term><term>Soil profiles</term><term>Soilof amazonia</term><term>Textural heterogeneity</term><term>Total porosity</term><term>Total soil carbon</term><term>Traditional agriculture</term><term>Vegetation</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: A comparative study was performed in the Oriental Amazon region of Brazil, on an experimental area of yellow latosol and red-yellow podzolic soils. Taking the forest soil as a reference, the chemical, physical, and micromorphological changes occurring after sequential burning, tillage and fallow-land were studied. Deforestation and tillage were responsible for a decreasing content and qualitative changes in organic matter; fulvic acid content first increased, then humic acid content decreased, giving rise to an increasing destruction of clay/organic complexes in the A horizon. As a result, a greater dispersion and migration of fine particles occurred, causing the obstruction of macropores and an increase in bulk density. Crop production decreased in two years, and the soil had to be abandoned. A secondary vegetation developed, and yielded organic residues which stimulated faunal activity. After three years under fallow, the above observed soil degradation processes were partially reversed.</div></front></TEI><affiliations><list><country><li>Brésil</li><li>Cameroun</li><li>France</li></country><region><li>Amazonas (Brésil)</li><li>Pará</li><li>État de São Paulo</li></region><settlement><li>São Paulo</li></settlement><orgName><li>Université de São Paulo</li></orgName></list><tree><country name="Brésil"><region name="Pará"><name sortKey="Da S Martins, Paulo F" sort="Da S Martins, Paulo F" uniqKey="Da S Martins P" first="Paulo F." last="Da S. Martins">Paulo F. Da S. Martins</name></region><name sortKey="Cerri, C C" sort="Cerri, C C" uniqKey="Cerri C" first="C. C." last="Cerri">C. C. Cerri</name><name sortKey="Chauvel, A" sort="Chauvel, A" uniqKey="Chauvel A" first="A." last="Chauvel">A. Chauvel</name></country><country name="Cameroun"><noRegion><name sortKey="Volkoff, B" sort="Volkoff, B" uniqKey="Volkoff B" first="B." last="Volkoff">B. 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