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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
08/10/2008 |
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Data da última atualização: |
18/07/2023 |
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Autoria: |
TOWNE, E. G.; KNAPP, A. K. |
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Título: |
Biomass and density responses in tallgrass prairie legumes to annual fire and topographic position. |
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Ano de publicação: |
1976 |
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Fonte/Imprenta: |
American Journal of Botany, v. 83, n. 2, p. 175-179, 1976. |
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DOI: |
https://doi.org/10.2307/2445935 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Annually burned tallgrass prairie is purported to be a nitrogen-limited system, especially when compared to unburned prairie. To test the hypothesis that legumes, potential nitrogen-fixers, would increase in relative abundance in annually burned sites, we assessed their density and biomass for two seasons on upland and lowland soils in annually burned and unburned watersheds. Total legume density was significantly higher in burned (8.0 ± 1.0 [SE] stems/m2) than in unburned watersheds (3.0 ± 0.3 stems/m2). Species with higher (P < 0.05) densities in burned than in unburned prairie included Amorpha canescens, Dalea candida, Dalea purpurea, Lespedeza violacea, Psoralea tenuiflora, and Schrankia nuttallii. Desmodium illinoense was the only legume that responded negatively to annual fire. Total legume biomass did not differ between burned (11.3 ± 1.3 g/m2) and unburned prairie (10.5 ± 0.9 g/m2). Biomass productions of Dalea candida and Psoralea tenuiflora were higher (P < 0.05) in burned than in unburned sites, but biomasses of other legumes were similar between burn treatments. Average individual stem masses of Amorpha canescens and Baptisia bracteata were significantly greater in unburned than in burned prairie. Legumes were affected differentially by topographic location. Total legume density was higher (P < 0.05) on lowland soils (6.6 ± 1.0 stems/m2) than on upland soils (4.3 ± 0.5 stems/m2). However, total legume biomass was not different between lowland soils (12.0 ± 1.2 g/m2) and upland soils (9.9 ± 1.0 g/m2). Densities and biomasses of Amorpha canescens, Desmodium illinoense, and Lespedeza capitata were higher on lowland sites than on upland sites, whereas densities and biomasses of Baptisia bracteata and Dalea purpurea were higher on upland than on lowland soils. Most legume species are either fire tolerant or exhibit a positive response to fire and their persistence in annually burned prairie suggests that they may play an important role in the nitrogen budget of this ecosystem. MenosAbstract: Annually burned tallgrass prairie is purported to be a nitrogen-limited system, especially when compared to unburned prairie. To test the hypothesis that legumes, potential nitrogen-fixers, would increase in relative abundance in annually burned sites, we assessed their density and biomass for two seasons on upland and lowland soils in annually burned and unburned watersheds. Total legume density was significantly higher in burned (8.0 ± 1.0 [SE] stems/m2) than in unburned watersheds (3.0 ± 0.3 stems/m2). Species with higher (P < 0.05) densities in burned than in unburned prairie included Amorpha canescens, Dalea candida, Dalea purpurea, Lespedeza violacea, Psoralea tenuiflora, and Schrankia nuttallii. Desmodium illinoense was the only legume that responded negatively to annual fire. Total legume biomass did not differ between burned (11.3 ± 1.3 g/m2) and unburned prairie (10.5 ± 0.9 g/m2). Biomass productions of Dalea candida and Psoralea tenuiflora were higher (P < 0.05) in burned than in unburned sites, but biomasses of other legumes were similar between burn treatments. Average individual stem masses of Amorpha canescens and Baptisia bracteata were significantly greater in unburned than in burned prairie. Legumes were affected differentially by topographic location. Total legume density was higher (P < 0.05) on lowland soils (6.6 ± 1.0 stems/m2) than on upland soils (4.3 ± 0.5 stems/m2). However, total legume biomass was not different between lowland soils (12.... Mostrar Tudo |
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Palavras-Chave: |
Nitrogen budgets; Prairie legumes; Tallgrass prairie. |
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Thesagro: |
Biomassa; Fixação de Nitrogênio; Fogo; Leguminosa. |
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Thesaurus Nal: |
Biomass production; Fires; Forage legumes; Grasses; Nitrogen fixation. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 02886naa a2200289 a 4500
001 1533773
005 2023-07-18
008 1976 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.2307/2445935$2DOI
100 1 $aTOWNE, E. G.
245 $aBiomass and density responses in tallgrass prairie legumes to annual fire and topographic position.$h[electronic resource]
260 $c1976
520 $aAbstract: Annually burned tallgrass prairie is purported to be a nitrogen-limited system, especially when compared to unburned prairie. To test the hypothesis that legumes, potential nitrogen-fixers, would increase in relative abundance in annually burned sites, we assessed their density and biomass for two seasons on upland and lowland soils in annually burned and unburned watersheds. Total legume density was significantly higher in burned (8.0 ± 1.0 [SE] stems/m2) than in unburned watersheds (3.0 ± 0.3 stems/m2). Species with higher (P < 0.05) densities in burned than in unburned prairie included Amorpha canescens, Dalea candida, Dalea purpurea, Lespedeza violacea, Psoralea tenuiflora, and Schrankia nuttallii. Desmodium illinoense was the only legume that responded negatively to annual fire. Total legume biomass did not differ between burned (11.3 ± 1.3 g/m2) and unburned prairie (10.5 ± 0.9 g/m2). Biomass productions of Dalea candida and Psoralea tenuiflora were higher (P < 0.05) in burned than in unburned sites, but biomasses of other legumes were similar between burn treatments. Average individual stem masses of Amorpha canescens and Baptisia bracteata were significantly greater in unburned than in burned prairie. Legumes were affected differentially by topographic location. Total legume density was higher (P < 0.05) on lowland soils (6.6 ± 1.0 stems/m2) than on upland soils (4.3 ± 0.5 stems/m2). However, total legume biomass was not different between lowland soils (12.0 ± 1.2 g/m2) and upland soils (9.9 ± 1.0 g/m2). Densities and biomasses of Amorpha canescens, Desmodium illinoense, and Lespedeza capitata were higher on lowland sites than on upland sites, whereas densities and biomasses of Baptisia bracteata and Dalea purpurea were higher on upland than on lowland soils. Most legume species are either fire tolerant or exhibit a positive response to fire and their persistence in annually burned prairie suggests that they may play an important role in the nitrogen budget of this ecosystem.
650 $aBiomass production
650 $aFires
650 $aForage legumes
650 $aGrasses
650 $aNitrogen fixation
650 $aBiomassa
650 $aFixação de Nitrogênio
650 $aFogo
650 $aLeguminosa
653 $aNitrogen budgets
653 $aPrairie legumes
653 $aTallgrass prairie
700 1 $aKNAPP, A. K.
773 $tAmerican Journal of Botany$gv. 83, n. 2, p. 175-179, 1976.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
13/01/2020 |
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Data da última atualização: |
13/01/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
B - 1 |
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Autoria: |
FERREIRA, M. R.; MARTUSCELLO, J. A.; BRAZ, T. G. dos S.; NASCIMENTO, A. A.; JANK, L.; ASSIS, J. A. de; ALMEIDA, O. G. de; REIS, G. de A.; SANTOS, M. V.; SANTOS, M. F. |
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Afiliação: |
Mariane Rodrigues Ferreira, Unicersidade Estadual Paulista, Jabotical; Janaina Azevedo Martuscello, Universidade Federal de São João del-Rei, São João del-Rei, MG; Thiago Gomes dos Santos Braz, Universidade Federal de Minas Gerais, Montes Claros, MG; Artur Amaral Nascimento, Universidade Estadual do Sudoeste da Bahia, Itapetinga, BA; LIANA JANK, CNPGC; Juliana Aparecida de Assis, Universidade de São Paulo, Piracicaba, SP; Otávio Goulart de Almeida, Universidade de São Paulo, Piracicaba, SP; Gabriel de Assis Reis, Universidade de São Paulo, Piracicaba; Márcia Vitória Santos, Universidade Fexderal dos Vales do Jequitinhonha e Mucuri, Diamantina, MG; MATEUS FIGUEIREDO SANTOS, CNPGC. |
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Título: |
Repeatability and genotypic stabilty of agronomic charecterisitics in Panicum maximum Jacq. |
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Ano de publicação: |
2019 |
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Fonte/Imprenta: |
Chilean Journal of Agricultural Research, v. 79, n. 4, Octuber-December 2019. |
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DOI: |
10.4067/S0718-58392019000400547 |
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Idioma: |
Inglês |
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Conteúdo: |
In experiments with selection of perennial plants, the initial performance is expected to be maintained throughout the productive life. The probability of repeating the agronomic response can be evaluated by the repeatability coefficient. The objective was to estimate repeatability coefficients of agronomic characteristics in Panicum maximum Jacq. using different methods and identify the best combinations between harvests according to the genotypic stabilization. Seventeen genotypes were evaluated in a randomized complete block design with three replicates. The coefficients of repeatability were estimated by the methods: ANOVA, structural analysis based on the mean of the correlation coefficients (SACOR), analysis of principal components based on the covariance matrix (PCCOV) and correlation matrix (PCCOR). In the genotypic stabilization, coefficients estimated by ANOVA and PCCOR were used. For total DM, repeatability coefficients ranged from 0.3500 to 0.4300 by the ANOVA and PCCOR methods, respectively. High repeatability coefficients were found for the characteristic leaf DM, while low coefficients were observed for leaf and stem percentages and leaf:stem ratio. For the genotypic stabilization of total DM and leaf:stem ratio, the best coefficients were observed for the combination of harvests 5 to 8. There are variations in the estimate of repeatability by different methods and the highest coefficients were those of the principal components based on the correlation and covariance matrices. For the genotypic stabilization, the best coefficients of repeatability and determination were observed for the harvests performed in the second rainy period. MenosIn experiments with selection of perennial plants, the initial performance is expected to be maintained throughout the productive life. The probability of repeating the agronomic response can be evaluated by the repeatability coefficient. The objective was to estimate repeatability coefficients of agronomic characteristics in Panicum maximum Jacq. using different methods and identify the best combinations between harvests according to the genotypic stabilization. Seventeen genotypes were evaluated in a randomized complete block design with three replicates. The coefficients of repeatability were estimated by the methods: ANOVA, structural analysis based on the mean of the correlation coefficients (SACOR), analysis of principal components based on the covariance matrix (PCCOV) and correlation matrix (PCCOR). In the genotypic stabilization, coefficients estimated by ANOVA and PCCOR were used. For total DM, repeatability coefficients ranged from 0.3500 to 0.4300 by the ANOVA and PCCOR methods, respectively. High repeatability coefficients were found for the characteristic leaf DM, while low coefficients were observed for leaf and stem percentages and leaf:stem ratio. For the genotypic stabilization of total DM and leaf:stem ratio, the best coefficients were observed for the combination of harvests 5 to 8. There are variations in the estimate of repeatability by different methods and the highest coefficients were those of the principal components based on the correlation and cov... Mostrar Tudo |
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Thesagro: |
Genótipo; Panicum Maximum; Pastagem. |
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Thesaurus NAL: |
Forage; Pastures. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/208578/1/Repeatability-and-genotypic.pdf
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Marc: |
LEADER 02562naa a2200301 a 4500
001 2118607
005 2020-01-13
008 2019 bl uuuu u00u1 u #d
024 7 $a10.4067/S0718-58392019000400547$2DOI
100 1 $aFERREIRA, M. R.
245 $aRepeatability and genotypic stabilty of agronomic charecterisitics in Panicum maximum Jacq.$h[electronic resource]
260 $c2019
520 $aIn experiments with selection of perennial plants, the initial performance is expected to be maintained throughout the productive life. The probability of repeating the agronomic response can be evaluated by the repeatability coefficient. The objective was to estimate repeatability coefficients of agronomic characteristics in Panicum maximum Jacq. using different methods and identify the best combinations between harvests according to the genotypic stabilization. Seventeen genotypes were evaluated in a randomized complete block design with three replicates. The coefficients of repeatability were estimated by the methods: ANOVA, structural analysis based on the mean of the correlation coefficients (SACOR), analysis of principal components based on the covariance matrix (PCCOV) and correlation matrix (PCCOR). In the genotypic stabilization, coefficients estimated by ANOVA and PCCOR were used. For total DM, repeatability coefficients ranged from 0.3500 to 0.4300 by the ANOVA and PCCOR methods, respectively. High repeatability coefficients were found for the characteristic leaf DM, while low coefficients were observed for leaf and stem percentages and leaf:stem ratio. For the genotypic stabilization of total DM and leaf:stem ratio, the best coefficients were observed for the combination of harvests 5 to 8. There are variations in the estimate of repeatability by different methods and the highest coefficients were those of the principal components based on the correlation and covariance matrices. For the genotypic stabilization, the best coefficients of repeatability and determination were observed for the harvests performed in the second rainy period.
650 $aForage
650 $aPastures
650 $aGenótipo
650 $aPanicum Maximum
650 $aPastagem
700 1 $aMARTUSCELLO, J. A.
700 1 $aBRAZ, T. G. dos S.
700 1 $aNASCIMENTO, A. A.
700 1 $aJANK, L.
700 1 $aASSIS, J. A. de
700 1 $aALMEIDA, O. G. de
700 1 $aREIS, G. de A.
700 1 $aSANTOS, M. V.
700 1 $aSANTOS, M. F.
773 $tChilean Journal of Agricultural Research$gv. 79, n. 4, Octuber-December 2019.
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