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Campo DC | Valor | Idioma |
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dc.contributor.author | Schwendener, Carol Melanie | - |
dc.contributor.author | Lehmann, Johannes | - |
dc.contributor.author | Camargo, Plínio Barbosa de | - |
dc.contributor.author | Luizâo, Regina Celi Costa | - |
dc.contributor.author | Fernandes, Erick C.M. | - |
dc.date.accessioned | 2020-06-15T22:03:27Z | - |
dc.date.available | 2020-06-15T22:03:27Z | - |
dc.date.issued | 2005 | - |
dc.identifier.uri | https://repositorio.inpa.gov.br/handle/1/18852 | - |
dc.description.abstract | It has been proposed that the C/N ratio, or quality, of litter or mulch mixtures affects N release. Although total N release from these mixtures and the effects on soil N are relatively well understood, a mechanistic understanding of the interactions between litter species with respect to their N release is still lacking. This study examines decomposition and N dynamics in mixtures of high-quality leguminous mulch, gliricidia [Gliricidia sepium (Jacq.) Kunth. ex Walp.] with a C/N ratio of 13, and low-quality cupuaçu [Theobroma grandiflorum (Wild. ex Spring) Schumann] litter with a C/N ratio of 42, which occur in combination in agroforestry systems. Ratios of 100:0, 80:20, 50:50, 20:80, 0:100 of fresh 15N-enriched gliricidia leaves and senescent cupuaçu leaves, totaling the same dry weight of 6.64 t ha-1, were applied to an Oxisol and sampled at 6, 14, 38, and 96 days after application. After more than 40% of the N in the gliricidia leaves had been released and the microbial biomass N reached its peak, a significant increase in available soil N occurred at day 14, which was more pronounced with greater amounts of gliricidia in the leaf mixture. However, relative to the N applied in the leaf mixture, there was no significant difference in available soil N with greater proportions of gliricidia. Total N release from the mixtures corresponded to the total N applied by gliricidia. Until day 38, cupuaçu C mineralization was significantly faster in the presence of the highest proportion of gliricidia compared to lower proportions. This faster C mineralization of more than 0.5% per day, however, did not increase total C loss or N release from cupuaçu leaves after 96 days. The use of 15N tracers identified an N transfer from gliricidia leaves and the soil to cupuaçu leaves and consequently, a lower N release from gliricidia to the soil in the presence of cupuaçu leaves. Though we expected that available N in the soil would also decrease with greater amounts of cupuaçu litter in the mixture, our results indicated an additive effect of the two species on N release and soil mineral N, with gross interactions between them canceling net interactive effects. Therefore, N release of leaf mixtures behaved as predicted from a calculated sum of individual release patterns, in spite of a transfer of N from the high- to the low-quality leaves. © 2004 Elsevier Ltd. All rights reserved. | en |
dc.language.iso | en | pt_BR |
dc.relation.ispartof | Volume 37, Número 4, Pags. 787-794 | pt_BR |
dc.rights | Restrito | * |
dc.subject | Biodiversity | en |
dc.subject | Biomass | en |
dc.subject | Forestry | en |
dc.subject | Gas Emissions | en |
dc.subject | Nitrogen | en |
dc.subject | Nutrition | en |
dc.subject | Soils | en |
dc.subject | Microbial Biomass | en |
dc.subject | Mineralization | en |
dc.subject | Nitrogen Transfer | en |
dc.subject | Plants (botany) | en |
dc.subject | Decomposition | en |
dc.subject | Leaf Litter | en |
dc.subject | Mulch | en |
dc.subject | Soil Nitrogen | en |
dc.subject | Biodiversity | en |
dc.subject | Biomass | en |
dc.subject | Emission | en |
dc.subject | Forestry | en |
dc.subject | Leaves | en |
dc.subject | Nitrogen | en |
dc.subject | Soil | en |
dc.subject | Gliricidia | en |
dc.subject | Gliricidia Sepium | en |
dc.subject | Theobroma | en |
dc.subject | Theobroma Grandiflorum | en |
dc.title | Nitrogen transfer between high- and low-quality leaves on a nutrient-poor Oxisol determined by 15N enrichment | en |
dc.type | Artigo | pt_BR |
dc.identifier.doi | 10.1016/j.soilbio.2004.10.011 | - |
dc.publisher.journal | Soil Biology and Biochemistry | pt_BR |
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