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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia. |
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Data corrente: |
23/11/2016 |
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Data da última atualização: |
23/11/2016 |
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Autoria: |
SANTOS, F. M.; CHAER, G. M.; DINIZ, A. R.; BALIEIRO, F. de C. |
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Afiliação: |
GUILHERME MONTANDON CHAER, CNPAB; FABIANO DE CARVALHO BALIEIRO, CNPS. |
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Título: |
Nutrient cycling over five years of mixed-species plantations of Eucalyptus and Acacia on a sandy tropical soil. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
Forest Ecology and Management v. 384, p. 110-121, Jan. 2017. |
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DOI: |
10.1016/j.foreco.2016.10.041 |
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Idioma: |
Português |
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Conteúdo: |
Mixed-species plantations have the potential to enhance nutrient cycling and increase the overall biomass of the stand. In this study, we evaluate the dynamics of nutrient accumulation and exports in mixed-species plantations of Eucalyptus urograndis (Eucalyptus urophylla S. T. Blake x Eucalyptus grandis W. Hill ex Maiden) and Acacia mangium Willd. after five years of rotation. Monocultures of Eucalyptus urograndis, with or without nitrogen fertilization (120 kg N ha-1) (E100 and E100 + N, respectively), and of Acacia mangium (A100) were established in a randomized block experimental design. Two arrangements with these species in mixed stands were also established: one with 50% of the stand density composed by each species (E50A50; 1,111 trees ha-1), and one high-density system, containing double the population of each species (E100A100; 2,222 trees ha-1). Aboveground biomass and litter nutrient contents, nutrient retranslocation from leaves, and nutrient export through wood harvesting were measured over a full rotation. Eucalyptus in E50A50, despite having half of the population of trees (555 trees ha-1), accumulated the same amount of nutrients in total aboveground biomass in relation to E100, suggesting a lower nutrient limitation to the growth of Eucalyptus in this mixed stand. Conversely, Eucalyptus in E100A100 did not accumulate proportionally larger amounts of nutrients in relation to E50A50, possibly due to intra- and interspecific competition in this high-density arrangement. The deposition of N and K via litter was higher in mixed-species stands than in Eucalyptus monocultures. Also, P, Ca and Mg depositions were higher in mixed-species stands than Acacia monocultures. These results suggest higher nutrient cycling and availability in the mixtures, especially after 30 months. The retranslocation of N in Eucalyptus and Acacia leaves decreased with age. At 60 months, Eucalyptus trees in E100A100 retranslocated less N than the trees in E100, probably reflecting the higher availability of soil N in relation to E100. At this same age, the Eucalyptus trees planted in E50A50 exported less N, P, K and Mg in relation to E100. However, at stand level, mixtures exported more N due to the enrichment of this nutrient in the soil promoted by Acacia. This study shows the importance of introducing Acacia in Eucalyptus plantations to promote a positive balance of nutrients for subsequent rotations and additional ecological benefits to the ecosystem due to N2-fixation from Acacia trees. MenosMixed-species plantations have the potential to enhance nutrient cycling and increase the overall biomass of the stand. In this study, we evaluate the dynamics of nutrient accumulation and exports in mixed-species plantations of Eucalyptus urograndis (Eucalyptus urophylla S. T. Blake x Eucalyptus grandis W. Hill ex Maiden) and Acacia mangium Willd. after five years of rotation. Monocultures of Eucalyptus urograndis, with or without nitrogen fertilization (120 kg N ha-1) (E100 and E100 + N, respectively), and of Acacia mangium (A100) were established in a randomized block experimental design. Two arrangements with these species in mixed stands were also established: one with 50% of the stand density composed by each species (E50A50; 1,111 trees ha-1), and one high-density system, containing double the population of each species (E100A100; 2,222 trees ha-1). Aboveground biomass and litter nutrient contents, nutrient retranslocation from leaves, and nutrient export through wood harvesting were measured over a full rotation. Eucalyptus in E50A50, despite having half of the population of trees (555 trees ha-1), accumulated the same amount of nutrients in total aboveground biomass in relation to E100, suggesting a lower nutrient limitation to the growth of Eucalyptus in this mixed stand. Conversely, Eucalyptus in E100A100 did not accumulate proportionally larger amounts of nutrients in relation to E50A50, possibly due to intra- and interspecific competition in this high-density ar... Mostrar Tudo |
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Palavras-Chave: |
Acumulação de nutrientes; Árvores de leguminosas fixadoras de nitrogênio; Coeficiente de utilização biológica; Consorciação de culturas; Retranslocação de nutrientes. |
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Categoria do assunto: |
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Marc: |
LEADER 03299nam a2200217 a 4500
001 2056952
005 2016-11-23
008 2017 bl uuuu u0uu1 u #d
024 7 $a10.1016/j.foreco.2016.10.041$2DOI
100 1 $aSANTOS, F. M.
245 $aNutrient cycling over five years of mixed-species plantations of Eucalyptus and Acacia on a sandy tropical soil.
260 $aForest Ecology and Management v. 384, p. 110-121, Jan. 2017.$c2017
520 $aMixed-species plantations have the potential to enhance nutrient cycling and increase the overall biomass of the stand. In this study, we evaluate the dynamics of nutrient accumulation and exports in mixed-species plantations of Eucalyptus urograndis (Eucalyptus urophylla S. T. Blake x Eucalyptus grandis W. Hill ex Maiden) and Acacia mangium Willd. after five years of rotation. Monocultures of Eucalyptus urograndis, with or without nitrogen fertilization (120 kg N ha-1) (E100 and E100 + N, respectively), and of Acacia mangium (A100) were established in a randomized block experimental design. Two arrangements with these species in mixed stands were also established: one with 50% of the stand density composed by each species (E50A50; 1,111 trees ha-1), and one high-density system, containing double the population of each species (E100A100; 2,222 trees ha-1). Aboveground biomass and litter nutrient contents, nutrient retranslocation from leaves, and nutrient export through wood harvesting were measured over a full rotation. Eucalyptus in E50A50, despite having half of the population of trees (555 trees ha-1), accumulated the same amount of nutrients in total aboveground biomass in relation to E100, suggesting a lower nutrient limitation to the growth of Eucalyptus in this mixed stand. Conversely, Eucalyptus in E100A100 did not accumulate proportionally larger amounts of nutrients in relation to E50A50, possibly due to intra- and interspecific competition in this high-density arrangement. The deposition of N and K via litter was higher in mixed-species stands than in Eucalyptus monocultures. Also, P, Ca and Mg depositions were higher in mixed-species stands than Acacia monocultures. These results suggest higher nutrient cycling and availability in the mixtures, especially after 30 months. The retranslocation of N in Eucalyptus and Acacia leaves decreased with age. At 60 months, Eucalyptus trees in E100A100 retranslocated less N than the trees in E100, probably reflecting the higher availability of soil N in relation to E100. At this same age, the Eucalyptus trees planted in E50A50 exported less N, P, K and Mg in relation to E100. However, at stand level, mixtures exported more N due to the enrichment of this nutrient in the soil promoted by Acacia. This study shows the importance of introducing Acacia in Eucalyptus plantations to promote a positive balance of nutrients for subsequent rotations and additional ecological benefits to the ecosystem due to N2-fixation from Acacia trees.
653 $aAcumulação de nutrientes
653 $aÁrvores de leguminosas fixadoras de nitrogênio
653 $aCoeficiente de utilização biológica
653 $aConsorciação de culturas
653 $aRetranslocação de nutrientes
700 1 $aCHAER, G. M.
700 1 $aDINIZ, A. R.
700 1 $aBALIEIRO, F. de C.
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Registro original: |
Embrapa Agrobiologia (CNPAB) |
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Registro Completo
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Biblioteca(s): |
Embrapa Roraima. |
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Data corrente: |
04/08/2021 |
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Data da última atualização: |
04/08/2021 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 2 |
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Autoria: |
COSTA, N. de L.; RODRIGUES, A. N. A. |
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Afiliação: |
NEWTON DE LUCENA COSTA, CPAF-RR. |
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Título: |
Evaluation of Natural Regrowth of Axonopus aureus under rest periods in Roraima's Savannas. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Research, Society and Development, v. 10, n.9, e56310918536, 2021. |
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Idioma: |
Inglês |
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Conteúdo: |
The natural regrowth of Axonopus aureus in native pasture of Roraima ́s savannas was evaluate, during early rainy period. The experimental design was a completely randomized, with four replications. The treatments consisted of four pasture rest periods (14, 28, 42 and 56 days after beginning of the rainy period). Evaluations were carry out during the period of June to August of 2016. The parameters measured were dry matter (DM) yields and grass morphogenetic and structural characteristics. The green and total DM, number of tillers plant-1, number of axillary tillers plant-1, number of live tillers plant-1, number of live leaves tiller-1 and leaf area index were directly proportional to rest periods. The leaf appearance and elongation rate were negatively affect by rest periods, while the dead DM was not affect by rest periods. Considering the low green DM availability of A. aureus, its recommends the utilization of some management practice, preferentially grazing or mowing, to remove the dead DM with low nutrition value and permit a grass vigorous regrowth in the beginning of the rainy period. |
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Palavras-Chave: |
Dry matter. |
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Thesaurus NAL: |
Leaves; Morphogenesis. |
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Categoria do assunto: |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/224801/1/RSD-2021-Evaluation-of-Natural-Regrowth-of-Axonopus-aureus-under-rest-periods-in-Roraima-Savannas.pdf
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Marc: |
LEADER 01637naa a2200169 a 4500
001 2133216
005 2021-08-04
008 2021 bl uuuu u00u1 u #d
100 1 $aCOSTA, N. de L.
245 $aEvaluation of Natural Regrowth of Axonopus aureus under rest periods in Roraima's Savannas.$h[electronic resource]
260 $c2021
520 $aThe natural regrowth of Axonopus aureus in native pasture of Roraima ́s savannas was evaluate, during early rainy period. The experimental design was a completely randomized, with four replications. The treatments consisted of four pasture rest periods (14, 28, 42 and 56 days after beginning of the rainy period). Evaluations were carry out during the period of June to August of 2016. The parameters measured were dry matter (DM) yields and grass morphogenetic and structural characteristics. The green and total DM, number of tillers plant-1, number of axillary tillers plant-1, number of live tillers plant-1, number of live leaves tiller-1 and leaf area index were directly proportional to rest periods. The leaf appearance and elongation rate were negatively affect by rest periods, while the dead DM was not affect by rest periods. Considering the low green DM availability of A. aureus, its recommends the utilization of some management practice, preferentially grazing or mowing, to remove the dead DM with low nutrition value and permit a grass vigorous regrowth in the beginning of the rainy period.
650 $aLeaves
650 $aMorphogenesis
653 $aDry matter
700 1 $aRODRIGUES, A. N. A.
773 $tResearch, Society and Development$gv. 10, n.9, e56310918536, 2021.
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Embrapa Roraima (CPAF-RR) |
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