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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
05/03/2009 |
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Data da última atualização: |
10/03/2009 |
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Autoria: |
VALLADARES, G. S.; PEREIRA, M. G.; ANJOS, L. H. C. dos.; EBELING, A. G. |
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Título: |
Caracterizacao de solos brasileiros com elevados teores de material organico. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
Magistra, Cruz das Almas, v.20, n.1, p.95-104, jan/mar. 2008. |
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Idioma: |
Português |
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Conteúdo: |
Dentre as classes de solos que ocorrem no territorio brasileiro, os Organossolos e solosafins, com elevados teores de material organico, apresentaram pequena extensao territoroal mas tem elevada utilizacao agricula e grande importancia ambiental. Este estudo foi desenvolvido com base em dados de perfis descritos e coletados em levantamentos de solos e trabalhos cientificos e tecnicos, principalmente da Embrapa e de Univercidades brasileiras em varias regioes do pais. O objetivo foi caracterizar melhor os Organossolos e solos afins no Brasil,com elevado teor de materia organica nos horizontes superficiais, quanto aos atributos morfologicos, fisicos e quimicos. Foram avaliados os seguintes atributos: cor, consistencia, estrutura, densidade, pH em agua, pH em KCI, H°, AI³°, CTC,soma de bases, saturacao por bases, nitrogenio total, carbono organico, relacao C/N, fosforo assimilavel e as relacoes entre alguns desses atrbutos. Sao mais comuns no Brasil solos com horizontes histicos com espessuras de ate 120 cm a parter da superficie do slo. A cor dos materiais organicos e a estrutura do solo estudados apresentam baixos valores do solo, variavel esta que se correlaciona negativamente ao teor de carbono organico. Sao predominantemente acidos, em especial os com materiais sulfrudicos, apresentam alta capacidade de troca cationica, soma de bases muito variavel e saturacao por bases baixas. A relacao C/N apresentou grande variacao ese correlacionou negativamente com o pH do solo. |
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Palavras-Chave: |
Materia organica; Organossolo; Propriedade fisica; Propriedade quimica; Solo; Turfa. |
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Categoria do assunto: |
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Marc: |
LEADER 02136naa a2200229 a 4500
001 1062606
005 2009-03-10
008 2008 bl uuuu u00u1 u #d
100 1 $aVALLADARES, G. S.
245 $aCaracterizacao de solos brasileiros com elevados teores de material organico.
260 $c2008
520 $aDentre as classes de solos que ocorrem no territorio brasileiro, os Organossolos e solosafins, com elevados teores de material organico, apresentaram pequena extensao territoroal mas tem elevada utilizacao agricula e grande importancia ambiental. Este estudo foi desenvolvido com base em dados de perfis descritos e coletados em levantamentos de solos e trabalhos cientificos e tecnicos, principalmente da Embrapa e de Univercidades brasileiras em varias regioes do pais. O objetivo foi caracterizar melhor os Organossolos e solos afins no Brasil,com elevado teor de materia organica nos horizontes superficiais, quanto aos atributos morfologicos, fisicos e quimicos. Foram avaliados os seguintes atributos: cor, consistencia, estrutura, densidade, pH em agua, pH em KCI, H°, AI³°, CTC,soma de bases, saturacao por bases, nitrogenio total, carbono organico, relacao C/N, fosforo assimilavel e as relacoes entre alguns desses atrbutos. Sao mais comuns no Brasil solos com horizontes histicos com espessuras de ate 120 cm a parter da superficie do slo. A cor dos materiais organicos e a estrutura do solo estudados apresentam baixos valores do solo, variavel esta que se correlaciona negativamente ao teor de carbono organico. Sao predominantemente acidos, em especial os com materiais sulfrudicos, apresentam alta capacidade de troca cationica, soma de bases muito variavel e saturacao por bases baixas. A relacao C/N apresentou grande variacao ese correlacionou negativamente com o pH do solo.
653 $aMateria organica
653 $aOrganossolo
653 $aPropriedade fisica
653 $aPropriedade quimica
653 $aSolo
653 $aTurfa
700 1 $aPEREIRA, M. G.
700 1 $aANJOS, L. H. C. dos.
700 1 $aEBELING, A. G.
773 $tMagistra, Cruz das Almas$gv.20, n.1, p.95-104, jan/mar. 2008.
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Biblioteca(s): |
Epagri-Sede. |
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Data corrente: |
08/08/2017 |
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Data da última atualização: |
08/08/2017 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
ZANELLA, P. G.; SBRISSIA, A. F.; PINTO, C. E.; GARAGORRY, F. C.; BALDISSERA, T. C.; GIUSTINA, L. H. P. D.; LAZZARETTI, J.; BARBOSA, A. |
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Título: |
Changes in botanical composition of native pastures as affected by grazings heights. |
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Ano de publicação: |
2017 |
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Fonte/Imprenta: |
In: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 54., 2017, Foz do Iguaçu. Resumos... Brasília: Sociedade Brasileira de Zootecnia, 2017. p. 546 |
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Idioma: |
Inglês |
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Conteúdo: |
Native pastures form a complex, dynamic and multifunctional ecosystem where it is possible to reconcile animal production with the preservation of biodiversity. The lack of knowledge about the species that compose native pastures and inadequate system management can lead to degradation of pastures and reduction of animal productivity. The aim of this study was to verify possible short-term changes in botanical composition of a native pasture submitted to different grazings heights and under intermittent stocking method. The experiment was carried out at the EPAGRI / Lages, SC, in an area of natural pasture with predominance of Andropogon lateralis. Pastures were grazed at four different heights (12, 20, 28 and 36 cm), based on the height of predominant species, and grazed down to 60% of pre-grazing height. The experimental design was a randomized complete block design with four replications. The number of species was determined according to the Botanal method (Thothill et al. 1992), in 16 frames of 0.25 m2 per experimental unit, arranged along four transects. Analysis of variance was performed and the means were compared by the Fisher test (LSD) with a level of significance of 5%. In the initial evaluation (Spring 2015), the condition was homogeneous for all pastures, with an average number of 33 species. Just one year after the beginning of experiment (Spring 2016), it was already observed the effect of grazing management on the number of species (P = 0.0392), with a lower number in the management with 36 cm (28 species) in relation to the others grazings heights (on average, 35 species). In the botanical evaluation it was identified 85 species, 35 of which belonging to Poaceae family and 3 to Fabaceae, all of them with interest as forage plants. The second family with the largest number of species was the Asteraceae (19). The management was determinant of the botanical composition and, in a short time, favored the development of species of prostrate growth in the lower grazings heights (12 and 20 cm) and of erect growth in the higher management heights (28 and 36). The reduction in the number of species in higher management results from the greater competitive ability of erect forming species, and demonstrates the importance of grazing in maintaining the richness of vegetal species in native pastoral ecosystems. MenosNative pastures form a complex, dynamic and multifunctional ecosystem where it is possible to reconcile animal production with the preservation of biodiversity. The lack of knowledge about the species that compose native pastures and inadequate system management can lead to degradation of pastures and reduction of animal productivity. The aim of this study was to verify possible short-term changes in botanical composition of a native pasture submitted to different grazings heights and under intermittent stocking method. The experiment was carried out at the EPAGRI / Lages, SC, in an area of natural pasture with predominance of Andropogon lateralis. Pastures were grazed at four different heights (12, 20, 28 and 36 cm), based on the height of predominant species, and grazed down to 60% of pre-grazing height. The experimental design was a randomized complete block design with four replications. The number of species was determined according to the Botanal method (Thothill et al. 1992), in 16 frames of 0.25 m2 per experimental unit, arranged along four transects. Analysis of variance was performed and the means were compared by the Fisher test (LSD) with a level of significance of 5%. In the initial evaluation (Spring 2015), the condition was homogeneous for all pastures, with an average number of 33 species. Just one year after the beginning of experiment (Spring 2016), it was already observed the effect of grazing management on the number of species (P = 0.0392), with a lower ... Mostrar Tudo |
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Palavras-Chave: |
Andropogon lateralis; Botanal; grazing intensity; specie richness; vegetation dynamics. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 03228naa a2200265 a 4500
001 1126493
005 2017-08-08
008 2017 bl uuuu u00u1 u #d
100 1 $aZANELLA, P. G.
245 $aChanges in botanical composition of native pastures as affected by grazings heights.$h[electronic resource]
260 $c2017
520 $aNative pastures form a complex, dynamic and multifunctional ecosystem where it is possible to reconcile animal production with the preservation of biodiversity. The lack of knowledge about the species that compose native pastures and inadequate system management can lead to degradation of pastures and reduction of animal productivity. The aim of this study was to verify possible short-term changes in botanical composition of a native pasture submitted to different grazings heights and under intermittent stocking method. The experiment was carried out at the EPAGRI / Lages, SC, in an area of natural pasture with predominance of Andropogon lateralis. Pastures were grazed at four different heights (12, 20, 28 and 36 cm), based on the height of predominant species, and grazed down to 60% of pre-grazing height. The experimental design was a randomized complete block design with four replications. The number of species was determined according to the Botanal method (Thothill et al. 1992), in 16 frames of 0.25 m2 per experimental unit, arranged along four transects. Analysis of variance was performed and the means were compared by the Fisher test (LSD) with a level of significance of 5%. In the initial evaluation (Spring 2015), the condition was homogeneous for all pastures, with an average number of 33 species. Just one year after the beginning of experiment (Spring 2016), it was already observed the effect of grazing management on the number of species (P = 0.0392), with a lower number in the management with 36 cm (28 species) in relation to the others grazings heights (on average, 35 species). In the botanical evaluation it was identified 85 species, 35 of which belonging to Poaceae family and 3 to Fabaceae, all of them with interest as forage plants. The second family with the largest number of species was the Asteraceae (19). The management was determinant of the botanical composition and, in a short time, favored the development of species of prostrate growth in the lower grazings heights (12 and 20 cm) and of erect growth in the higher management heights (28 and 36). The reduction in the number of species in higher management results from the greater competitive ability of erect forming species, and demonstrates the importance of grazing in maintaining the richness of vegetal species in native pastoral ecosystems.
653 $aAndropogon lateralis
653 $aBotanal
653 $agrazing intensity
653 $aspecie richness
653 $avegetation dynamics
700 1 $aSBRISSIA, A. F.
700 1 $aPINTO, C. E.
700 1 $aGARAGORRY, F. C.
700 1 $aBALDISSERA, T. C.
700 1 $aGIUSTINA, L. H. P. D.
700 1 $aLAZZARETTI, J.
700 1 $aBARBOSA, A.
773 $tIn: REUNIÃO ANUAL DA SOCIEDADE BRASILEIRA DE ZOOTECNIA, 54., 2017, Foz do Iguaçu. Resumos... Brasília: Sociedade Brasileira de Zootecnia, 2017. p. 546
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