Phosphorus availability in casts of an anecic savanna earthworms in Colombian oxisol

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cg.coverage.countryColombia
cg.coverage.iso3166-alpha2CO
cg.coverage.regionSouth America
cg.identifier.urlhttps://books.google.com.co/books/p/pub-2347935248438357?id=-uLuarMugHIC&pg=PA199en
dc.contributor.authorJiménez Jaén, J.J.en
dc.contributor.authorCepeda, Aen
dc.contributor.authorFriesen, Dennis K.en
dc.contributor.authorDecaëns, Thibauden
dc.contributor.authorOberson, Astriden
dc.date.accessioned2015-01-28T14:17:31Zen
dc.date.available2015-01-28T14:17:31Zen
dc.identifier.urihttps://hdl.handle.net/10568/55178
dc.titlePhosphorus availability in casts of an anecic savanna earthworms in Colombian oxisolen
dcterms.abstractEarthworms are considered soil ecosystem engineers that play an important role in soil organic matter dynamics and physical structure. Due to both their size and activities these organisms can accelerate the decomposition and mineralization of organic matter by reducing the size of residues to particles more available to microflora. Consequently, their impact in nutrient availability and cycling in natural and agricultural ecosystems can be considerable. Three experiments were performed in a natural herbaceous savanna and in a selected Brachiaria decumbens and Pueraria phaseoloides ("Kudzu") pasture: one field study and two laboratory/incubation studies, at the CIAT-CORPOICA research station at Carimagua in the isohyperthermic savannas on the Colombian Orinoco basin. Total P content was higher in earthworm casts than in the surrounding soil in field samples, i.e., 50% in native savanna soil and more than 100% in pasture soil, but not (or very little) in laboratory casts (10%-20%). Under field conditions almost without exception, all P fractions increased in casts compared with the control soil. Increases were relatively greater in the labile inorganic P fractions. Except in the native savanna under field conditions, the phosphatase activity was reduced on casting. Our results suggest that earthworms in the field incorporate P from litter or undecomposed plant and root material which is not normally measured in the analysis of bulk (non-cast) soil. This P from litter enters into all P fractions (organic and inorganic) but to a greater extent into labile Pi fractions. The objective of this study was to assess the effect of an abundant native anecic earthworm on phosphorus availability in Oxisols of supposedly low fertility characteristics.en
dcterms.accessRightsOpen Access
dcterms.bibliographicCitationJiménez Jaén, Juan José; Cepeda, A.; Friesen, Dennis Keith; Decaëns, Thibaud; Oberson, Astrid. 2001. Phosphorus availability in casts of an anecic savanna earthworms in Colombian oxisol. In: Jiménez Jaén, Juan José; Thomas, Richard J. (eds.). Nature`s plow: Soil macroinvertebrate communities in the neotropical savannas of Colombia. Centro Internacional de Agricultura Tropical (CIAT), Cali, CO. p. 199-211. (CIAT publication no. 324)en
dcterms.extentp. 199-211en
dcterms.issued2001
dcterms.languageen
dcterms.publisherInternational Center for Tropical Agricultureen
dcterms.subjectlumbricidaeen
dcterms.subjectcyclingen
dcterms.subjectphosphorusen
dcterms.subjectsoil faunaen
dcterms.subjectsavannasen
dcterms.subjectciclo biogeoquímicoen
dcterms.subjectfósforoen
dcterms.subjectfauna del sueloen
dcterms.subjectsabanasen
dcterms.typeBook Chapter

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