Nitrogen cycling in monospecific and mixed-species plantations of Acacia mangium and Eucalyptus at 4 sites in Brazil

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Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.creatorVoigtlaender, M.-
Autor(es): dc.creatorBrandani, C. B.-
Autor(es): dc.creatorCaldeira, D. R.M.-
Autor(es): dc.creatorTardy, F.-
Autor(es): dc.creatorBouillet, J. P.-
Autor(es): dc.creatorGonçalves, J. L.M.-
Autor(es): dc.creatorMoreira, M. Z.-
Autor(es): dc.creatorLeite, F. P.-
Autor(es): dc.creatorBrunet, D.-
Autor(es): dc.creatorPaula, R. R.-
Autor(es): dc.creatorLaclau, J. P.-
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Descrição: dc.descriptionMixing N-fixing trees with eucalypts is an attractive option to improve the long-term soil N status in fast-growing plantations established in tropical soils. A randomized block design was replicated at four sites in Brazil to compare the biogeochemical cycles in mono-specific stands of Eucalyptus (100E) and Acacia mangium (100A) with mixed-species plantations in a proportion of 1:1 (50A50E). Our study aimed to assess the effects of introducing A. mangium trees in Eucalyptus plantations on atmospheric N 2 fixation, N cycling and soil organic matter stocks. Litterfall and soil N mineralization were measured over the last two years of the rotation (4–6 years after planting). Aboveground N accumulation in the trees and C and N stocks in the forest floor and in the top soil were intensively sampled at harvesting age. N 2 fixation rates were estimated using the natural abundance of 15 N as well as by the difference between total N stocks in 100A and 50A50E relative to 100E (accretion method). While the 15 N natural abundance method was unsuitable, the accretion method showed consistently across the four sites that atmospheric N fixation reached about 250 and 400 kg N ha −1 rotation −1 in 50A50E and 100A, respectively. Except at one site with high mortality, N contents within trees at harvesting were approximately 40% higher in 100A than in 100E. Mean N contents in litterfall and N mineralization rates were about 60% higher in 100A than in 100E, with intermediate values in 50A50E. The amounts of N in litterfall were much more dependent on soil N mineralization rates for acacia trees than for eucalypt trees. Soil C and N stocks were dependent on soil texture but not influenced by tree species. N budgets over a 6-year rotation were enhanced by about 65 kg N ha −1 yr −1 in 100A and 40 kg N ha −1 yr −1 in 50A50E relative to monospecific eucalypt plantations. Introducing N-fixing trees in eucalypt plantations might therefore contribute to reducing the need for mineral N fertilization in the long-term.-
Formato: dc.format56-67-
Idioma: dc.languageen-
Relação: dc.relationForest Ecology and Management-
Direitos: dc.rightsopenAccess-
Palavras-chave: dc.subjectEucalypt-
Palavras-chave: dc.subjectLitterfall-
Palavras-chave: dc.subjectN 2 fixation-
Palavras-chave: dc.subjectNutrition-
Palavras-chave: dc.subjectOrganic matter-
Palavras-chave: dc.subjectTree mixtures-
Palavras-chave: dc.subjectTropical plantations-
Título: dc.titleNitrogen cycling in monospecific and mixed-species plantations of Acacia mangium and Eucalyptus at 4 sites in Brazil-
Tipo de arquivo: dc.typelivro digital-
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