Plant litter decomposition in a semiarid rangeland of Argentina: species and defoliation effects

cic.lugarDesarrolloUniversidad Nacional del Sures
dc.titlePlant litter decomposition in a semiarid rangeland of Argentina: species and defoliation effectsen
dcterms.abstractPlant litter decomposition is critical for terrestrial ecosystem productivity. Poa ligularis Nees ex Steud and Nassella tenuis (Phil.) Barkworth are native, desirable perennial grasses in central Argentina’s rangelands. Amelichloa ambigua (Speg.)Arriaga&Barkworth is only consumed when a better forage is unavailable. Litter traps were used to collect aboveground litter during two years. In March 2012, six bags, each one containing either leaf blade (three bags, one per species) or root litter (three bags, one per species) of the three species were located belowthe canopy of each replicate plant of the studied species (hereafter referred to as ‘location’). Blade litter bags were located on the soil surface, and root litter bags buried at 10 cm soil depth. This allowed evaluation of the effects of defoliation, the different species canopies and the microbial community activity around their roots on decomposition of above- and belowground litter. For each species, twenty plants were either defoliated twice (5 cm stubble height) or remained undefoliated during the growing season. Litter bagswere collected after 2, 7, 13 and 24months incubation. The studywas repeated in 2013, with additional bagswere placed forNcontent determination on leaf blade and root litters. Aboveground litter productionwas highest in P. ligularis; however, no differences were observed among species when the effect of plant size was eliminated. Aboveground litter of desirable species had higher N content and decomposed faster than that of A. ambigua. The opposite was recorded for root litter. Defoliation had no effect on litter decomposition, but location effects were detected after one year of incubation. Desirable perennial grasses promoted organicmatter loss fromlitter, a key factor in increasing soil fertility in this semiarid ecosystem.en
dcterms.creator.authorAmbrosino, Mariela
dcterms.creator.authorBusso, Carloses
dcterms.creator.authorTorres, Yanina Alejandraes
dcterms.creator.authorIthurrart, Leticia
dcterms.creator.authorMartínez, Juan
dcterms.creator.authorMinoldo, Gabrielaes
dcterms.creator.authorCardillo, Daniela
dcterms.creator.authorPalomo, Iris
dcterms.identifier.urlRecurso onlinees
dcterms.isPartOf.issuevol. 41, no. 5es
dcterms.isPartOf.seriesThe Rangeland Journales
dcterms.licenseAttribution-NonCommercial-ShareAlike 4.0 International (BY-NC-SA 4.0)es
dcterms.subjectDesirable and undesirable grassesen
dcterms.subjectLeaf litteren
dcterms.subjectPerennial grassesen
dcterms.subject.materiaCiencias de las Plantas, Botánicaes
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