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Registro Completo |
Biblioteca(s): |
Embrapa Amapá. |
Data corrente: |
04/10/2011 |
Data da última atualização: |
29/05/2017 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
PAIVA, P. M.; GUEDES, M. C.; FUNI, C. |
Afiliação: |
PAULO MARCELO VERAS DE PAIVA, CPAF-AP; MARCELINO CARNEIRO GUEDES, CPAF-AP; Claudia Funi, Programa de Pós-Graduação em Biodiversidade Tropical, Universidade Federal do Amapá. |
Título: |
Brazil nut conservation through shifting cultivation. |
Ano de publicação: |
2011 |
Fonte/Imprenta: |
Forest Ecology and Management, v. 261, n. 3, p. 508-541, Feb. 2011. |
Idioma: |
Inglês |
Conteúdo: |
The regeneration of Brazil nut trees depends on tree-fall gaps in the forest. However, shifting cultivation fallows also create comparable biotic and abiotic opportunities for the dispersion and establishment of this gap-loving species. At the same time, the ability of Brazil nut trees to resprout enables fallow individuals to survive successive slash-and-burn cycles. Recognizing the importance of shifting cultivation for the food security of forest dwellers, we investigated whether the high level of Brazil nut regeneration found in cultivation fallows could be explained by the resprouting capability of Brazil nut trees, the number of cultivation cycles, past agricultural use and distance to the nearest conspecific productive adults. We found that the Brazil nut tree population density increased from 8.86 trees ha?1 to 13.69 trees ha?1 and 27.09 trees ha?1 at sites after one, two and three or more shifting cultivation cycles, respectively. As a consequence of resprouting, after a certain number of shifting cultivation cycles, the fallows become dominated by Brazil nut trees, and the landholders may decide to preserve them and to exclude enriched sites from future agricultural use. Protected for their extractive value, the secondary forests spontaneously enriched with Brazil nut trees are allowed to develop into nut-producing forests that have reduced chances of conversion into crops or pastures, thus reversing the classical process of Amazon forest degradation. |
Palavras-Chave: |
Cultivo. |
Thesagro: |
Castanha. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/42810/1/AP-2011-Brazilnut.pdf
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Marc: |
LEADER 01955naa a2200169 a 4500 001 1902187 005 2017-05-29 008 2011 bl uuuu u00u1 u #d 100 1 $aPAIVA, P. M. 245 $aBrazil nut conservation through shifting cultivation.$h[electronic resource] 260 $c2011 520 $aThe regeneration of Brazil nut trees depends on tree-fall gaps in the forest. However, shifting cultivation fallows also create comparable biotic and abiotic opportunities for the dispersion and establishment of this gap-loving species. At the same time, the ability of Brazil nut trees to resprout enables fallow individuals to survive successive slash-and-burn cycles. Recognizing the importance of shifting cultivation for the food security of forest dwellers, we investigated whether the high level of Brazil nut regeneration found in cultivation fallows could be explained by the resprouting capability of Brazil nut trees, the number of cultivation cycles, past agricultural use and distance to the nearest conspecific productive adults. We found that the Brazil nut tree population density increased from 8.86 trees ha?1 to 13.69 trees ha?1 and 27.09 trees ha?1 at sites after one, two and three or more shifting cultivation cycles, respectively. As a consequence of resprouting, after a certain number of shifting cultivation cycles, the fallows become dominated by Brazil nut trees, and the landholders may decide to preserve them and to exclude enriched sites from future agricultural use. Protected for their extractive value, the secondary forests spontaneously enriched with Brazil nut trees are allowed to develop into nut-producing forests that have reduced chances of conversion into crops or pastures, thus reversing the classical process of Amazon forest degradation. 650 $aCastanha 653 $aCultivo 700 1 $aGUEDES, M. C. 700 1 $aFUNI, C. 773 $tForest Ecology and Management$gv. 261, n. 3, p. 508-541, Feb. 2011.
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Embrapa Amapá (CPAF-AP) |
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Registro Completo
Biblioteca(s): |
Embrapa Uva e Vinho. |
Data corrente: |
06/01/2021 |
Data da última atualização: |
06/01/2021 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
KULMANN, M. S. de S.; SETE, P. B.; PAULA, B. V. de; STEFANELLO, L. O.; SCHWALBERT, R.; SCHWALBERT, R. A.; ARRUDA, W. S.; SANS, G. A.; PARCIANELLO, C. F.; NICOLOSO, F. T.; MELO, G. W. B. de; SANTOS, H. P. dos; BRUNETTO, G. |
Afiliação: |
MATHEUS SEVERO DE SOUZA KULMANN, Soil Science Department of Federal, University of Santa Maria (UFSM), 97105-900, Santa Maria, RS, Brazil; PAULA BEATRIZ SETE, Federal University of Santa Catarina, Rodovia Admar Gonzaga, 1346, CEP 88034-001, Florianópolis, SC, Brazil; BETANIA VAHL DE PAULA, Soil Science Department of Federal, University of Santa Maria (UFSM), 97105-900, Santa Maria, RS, Brazil; LINCON OLIVEIRA STEFANELLO, Soil Science Department of Federal, University of Santa Maria (UFSM), 97105-900, Santa Maria, RS, Brazil; RAÍSSA SCHWALBERT, Agronomy Department of Federal, University of Santa Maria (UFSM), 97105-900, Santa Maria, RS, Brazil; RAÍ AUGUSTO SCHWALBERT, Agronomy Department of Federal, University of Santa Maria (UFSM), 97105-900, Santa Maria, RS, Brazil; WAGNER SQUIZANI ARRUDA, Soil Science Department of Federal, University of Santa Maria (UFSM), 97105-900, Santa Maria, RS, Brazil; GABRIEL ALBERTO SANS, Soil Science Department of Federal, University of Santa Maria (UFSM), 97105-900, Santa Maria, RS, Brazil; CAROLINA FLOGIARINI PARCIANELLO, Soil Science Department of Federal, University of Santa Maria (UFSM), 97105-900, Santa Maria, RS, Brazil; FERNANDO TEIXEIRA NICOLOSO, Agronomy Department of Federal, University of Santa Maria (UFSM), 97105-900, Santa Maria, RS, Brazil; GEORGE WELLINGTON BASTOS DE MELO, CNPUV; HENRIQUE PESSOA DOS SANTOS, CNPUV; GUSTAVO BRUNETTO, Soil Science Department of Federal, University of Santa Maria (UFSM), 97105-900, Santa Maria, RS, Brazil. |
Título: |
Kinetic parameters govern of the uptake of nitrogen forms in "Paulsen" and "Magnolia" grapevine rootstocks. |
Ano de publicação: |
2020 |
Fonte/Imprenta: |
Scientia Horticulturae, v. 264, article 109174, 2020. |
DOI: |
10.1016/j.scienta.2020.109174 |
Idioma: |
Inglês |
Conteúdo: |
Grapevine rootstocks are selected according to graft compatibility, pathogen tolerance and water stress. However, morphological and kinetic parameters of nutrient absorption, such as nitrate (NO3 −) and ammonium (NH4 +), usually are not considered. The study aimed to select, based on morphological and kinetic absorption parameters, grapevine rootstocks with greater efficiency of N-forms absorption. The study was performed with two grapevine rootstocks (?Paulsen 1103? and ?Magnolia?), grown in Hoagland nutrient solution in a greenhouse. After 21 d, they were placed in 0.05 mol L-1 CaSO4 solution for 20 d to exhaust nutrient internal reserves. The rootstock with highest NO3 − and NH4 + uptake efficiency was ?Paulsen 1103?, since it presented lower Cmin and Km values in the two N forms, allowing N extraction by roots, even in low concentrations in solution, due to the higher transporter affinity for NO3 − and NH4 + in roots from rootstock. ?Paulsen 1103? rootstock also presented better photosynthetic performance and root development, collaborating for greater growth and mass production than 'Magnolia' rootstock. On the other hand, ?Magnolia? rootstock showed higher NO3 − and NH4 + Cmin and Km values than ?Paulsen? rootstock, which shows lower transporters affinity for these ions. Results demonstrate the importance of the use of NO3 − and NH4 + uptake kinetic parameters in grapevine rootstock selection programs, since these may serve as indicator of plant's ability to absorb NO3 − and NH4 + in low concentrations. MenosGrapevine rootstocks are selected according to graft compatibility, pathogen tolerance and water stress. However, morphological and kinetic parameters of nutrient absorption, such as nitrate (NO3 −) and ammonium (NH4 +), usually are not considered. The study aimed to select, based on morphological and kinetic absorption parameters, grapevine rootstocks with greater efficiency of N-forms absorption. The study was performed with two grapevine rootstocks (?Paulsen 1103? and ?Magnolia?), grown in Hoagland nutrient solution in a greenhouse. After 21 d, they were placed in 0.05 mol L-1 CaSO4 solution for 20 d to exhaust nutrient internal reserves. The rootstock with highest NO3 − and NH4 + uptake efficiency was ?Paulsen 1103?, since it presented lower Cmin and Km values in the two N forms, allowing N extraction by roots, even in low concentrations in solution, due to the higher transporter affinity for NO3 − and NH4 + in roots from rootstock. ?Paulsen 1103? rootstock also presented better photosynthetic performance and root development, collaborating for greater growth and mass production than 'Magnolia' rootstock. On the other hand, ?Magnolia? rootstock showed higher NO3 − and NH4 + Cmin and Km values than ?Paulsen? rootstock, which shows lower transporters affinity for these ions. Results demonstrate the importance of the use of NO3 − and NH4 + uptake kinetic parameters in grapevine rootstock selection programs, since these may serve as indicator of... Mostrar Tudo |
Palavras-Chave: |
Cmin; Influx; Km and Vmax; Nitrogen uptake efficiency; NO3 and NH4; Rootstock selection. |
Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/219914/1/1-s2.0-S0304423820300029-main.pdf
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Marc: |
LEADER 02595naa a2200349 a 4500 001 2128996 005 2021-01-06 008 2020 bl uuuu u00u1 u #d 024 7 $a10.1016/j.scienta.2020.109174$2DOI 100 1 $aKULMANN, M. S. de S. 245 $aKinetic parameters govern of the uptake of nitrogen forms in "Paulsen" and "Magnolia" grapevine rootstocks.$h[electronic resource] 260 $c2020 520 $aGrapevine rootstocks are selected according to graft compatibility, pathogen tolerance and water stress. However, morphological and kinetic parameters of nutrient absorption, such as nitrate (NO3 −) and ammonium (NH4 +), usually are not considered. The study aimed to select, based on morphological and kinetic absorption parameters, grapevine rootstocks with greater efficiency of N-forms absorption. The study was performed with two grapevine rootstocks (?Paulsen 1103? and ?Magnolia?), grown in Hoagland nutrient solution in a greenhouse. After 21 d, they were placed in 0.05 mol L-1 CaSO4 solution for 20 d to exhaust nutrient internal reserves. The rootstock with highest NO3 − and NH4 + uptake efficiency was ?Paulsen 1103?, since it presented lower Cmin and Km values in the two N forms, allowing N extraction by roots, even in low concentrations in solution, due to the higher transporter affinity for NO3 − and NH4 + in roots from rootstock. ?Paulsen 1103? rootstock also presented better photosynthetic performance and root development, collaborating for greater growth and mass production than 'Magnolia' rootstock. On the other hand, ?Magnolia? rootstock showed higher NO3 − and NH4 + Cmin and Km values than ?Paulsen? rootstock, which shows lower transporters affinity for these ions. Results demonstrate the importance of the use of NO3 − and NH4 + uptake kinetic parameters in grapevine rootstock selection programs, since these may serve as indicator of plant's ability to absorb NO3 − and NH4 + in low concentrations. 653 $aCmin 653 $aInflux 653 $aKm and Vmax 653 $aNitrogen uptake efficiency 653 $aNO3 and NH4 653 $aRootstock selection 700 1 $aSETE, P. B. 700 1 $aPAULA, B. V. de 700 1 $aSTEFANELLO, L. O. 700 1 $aSCHWALBERT, R. 700 1 $aSCHWALBERT, R. A. 700 1 $aARRUDA, W. S. 700 1 $aSANS, G. A. 700 1 $aPARCIANELLO, C. F. 700 1 $aNICOLOSO, F. T. 700 1 $aMELO, G. W. B. de 700 1 $aSANTOS, H. P. dos 700 1 $aBRUNETTO, G. 773 $tScientia Horticulturae$gv. 264, article 109174, 2020.
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