Phosphorus pools in bulk soil and aggregates of differently textured oxisols under different land-use systems in the Brazilian cerrados

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cg.coverage.countryBrazil
cg.coverage.iso3166-alpha2BR
cg.coverage.regionSouth America
cg.identifier.urlhttp://ciat-library.ciat.cgiar.org/Articulos_Ciat/biblioteca/Sustainable_land_management_for_the_oxis.pdf#page=168en
cg.subject.ciatLAND USEen
cg.subject.ciatSOIL HEALTHen
dc.contributor.authorLilienfein, Jen
dc.contributor.authorWilcke, W.en
dc.contributor.authorNeufeldt, Henryen
dc.contributor.authorAyarza, Miguel Angelen
dc.contributor.authorZech, W.en
dc.date.accessioned2015-01-28T14:17:28Zen
dc.date.available2015-01-28T14:17:28Zen
dc.identifier.urihttps://hdl.handle.net/10568/55136
dc.titlePhosphorus pools in bulk soil and aggregates of differently textured oxisols under different land-use systems in the Brazilian cerradosen
dcterms.abstractThis study assessed the influence of land use (continuous cropping, CC; tree plantations, F; pasture, PG; and native savanna, NS) on P concentrations and partitioning in bulk soil and two aggregate size fractions of two Oxisols, one loamy and one clayey. The quantity and quality of physically protected P within aggregates were also determined. Total P in bulk soil and macroaggregates (0.25-2 mm and 2-8 mm) was partitioned into inorganic and organic P fractions (P, and P., respectively) after sequential extraction, using NaHCO, (Olsen), NaOH, HCl, and H2SO4 (residual). Additionally, P binding was examined with 31P nuclear magnetic resonance spectroscopy. Total P concentrations were 70-170 mg/kg in the loamy and 300-450 mg/kg in the clayey soil. The largest P fraction was the NaOH-soluble P (33%-55% of total P concentration). The proportion of easily extractable P was higher in the loamy than in the clayey soil. Because of fertilization, CC and F had higher total and, particularly, higher easily available P concentrations than NS and PG. In the loamy soil, Pi and, in the clayey soil, both Pi and P., were higher in CC and F than in NS and PG. In the loamy soil, P concentrations in macroaggregates (>2 mm) were higher than in bulk soil. Higher monoester P proportions within the large macroaggregates in unplowed systems indicated older intra-aggregate soil organic matter than at the aggregate surfaces. In the plowed system, the monoester/diester ratio was not different between bulk soil and aggregate fractions, indicating faster aggregate turnover.en
dcterms.accessRightsOpen Access
dcterms.bibliographicCitationLilienfein, Juliane; Wilcke, Wolfgang; Neufeldt, Henry; Ayarza, Miguel Angel; Zech, Wolfgang. 1999. Phosphorus pools in bulk soil and aggregates of differently textured oxisols under different land-use systems in the Brazilian cerrados. In: Thomas, Richard J.; Ayarza, Miguel Angel (eds.). Sustainable land management for the oxisols of the Latin American savannas: Dynamics of soil organic matter and indicators of soil quality. Centro Internacional de Agricultura Tropical (CIAT), Cali, CO. p. 159-172. (CIAT publication no. 312)en
dcterms.extentp. 159-172en
dcterms.issued1999
dcterms.languageen
dcterms.publisherInternational Center for Tropical Agricultureen
dcterms.subjectsavannasen
dcterms.subjectland useen
dcterms.subjectsabanasen
dcterms.subjectoxisolsen
dcterms.subjectparticle sizeen
dcterms.subjectphosphorusen
dcterms.subjectutilización de la tierraen
dcterms.subjectoxisolesen
dcterms.subjecttamaño de la partículaen
dcterms.subjectfósforoen
dcterms.typeBook Chapter

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