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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: |
01/08/1992 |
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Data da última atualização: |
28/11/2023 |
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Autoria: |
KELLY, R. D.; WALKER, B. H. |
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Título: |
The effects of different forms of land use on the ecology of a Semi-Arid region in South-Eastern Rhodesia. |
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Ano de publicação: |
1976 |
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Fonte/Imprenta: |
Journal of Ecology, v. 64, n. 2, p. 553-576, Jul. 1976. |
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Idioma: |
Inglês |
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Conteúdo: |
A study was made in 1970-2 of the effects of four different utilization reg vegetation ('lowveld') on shallow basalt soils in Rhodesia. These were light utilization by wild herbivores, moderate utilization by cattle and int by cattle and goats. Total above-ground standing crop of shrubs and trees varied betwe utilization) and 9 t ha- (intensive utilization). The seasonal productio and twigs varied from 2 t ha-' (nil utilization) to 0-6 t ha-' (intensi Most of the differences in the herbaceous vegetation attributable to uti result of the intensity of use rather than the different species of herbiv was dominated by annual grasses in intensively utilized areas and by p in areas of light and moderate utilization. The areas dominated characterized by large fluctuations in above-ground seasons (up to 400% change) in response to rainfall, whil in the swards dominated by perennials (c. 100%). Differe 68%, respectively, in areas of intensive, moderate and li on infiltration of rainfall since water was found to infiltrate nine times faster into soil covered by litter than into bare soil. In a dry year (c. 300 mm rainfall) seasonal above ground herbaceous production varied from c. 0-25 t ha-' in areas of intensive use to c. 1 t ha- in areas of light use. In a wet season (c. 600 mm rainfall) production for the same areas was c. 1.2 t ha- and 2 t ha- , respectively. Protein content of swards dominated by annual grasses remained high throughout the season, never dropping below c. 9%, while that of communities dominated by perennial grasses dropped from c. 12% in the early season to below 5% in the late season. However, total quantities of protein and other foodstuffs available were, at all times, much greater where utilization was moderate or light than where intensive. Continuous intensive use was resulting in all grasses in these areas being completely consumed during the growing season, leaving little or no herbage for the seven- or eight-month dry season. In areas dominated by perennial grasses, the large standing crop of forage, although not of very high nutritive quality, resulted in considerable quantities of herbage remaining for dry season consumption. The energy content of the herbaceous vegetation was 17 522 J g- (4185 kcal g- 1) and the efficiency of the herbaceous component of the vegetation in trapping radiant energy over the five-month growing season ranged from 0-01 to 0-06%. It was concluded that swards exhibiting the most desirable characteristics were those in areas of light and moderate use. In areas of non-use sward vigour was declining and the proportion of bare soil surface and scrub was increasing. Intensive utilization was resulting in a change in dominance from perennial to annual grasses, with increasing year to year fluctuations in seasonal production, a large proportion of bare soil and increasing run-off of rain-wat MenosA study was made in 1970-2 of the effects of four different utilization reg vegetation ('lowveld') on shallow basalt soils in Rhodesia. These were light utilization by wild herbivores, moderate utilization by cattle and int by cattle and goats. Total above-ground standing crop of shrubs and trees varied betwe utilization) and 9 t ha- (intensive utilization). The seasonal productio and twigs varied from 2 t ha-' (nil utilization) to 0-6 t ha-' (intensi Most of the differences in the herbaceous vegetation attributable to uti result of the intensity of use rather than the different species of herbiv was dominated by annual grasses in intensively utilized areas and by p in areas of light and moderate utilization. The areas dominated characterized by large fluctuations in above-ground seasons (up to 400% change) in response to rainfall, whil in the swards dominated by perennials (c. 100%). Differe 68%, respectively, in areas of intensive, moderate and li on infiltration of rainfall since water was found to infiltrate nine times faster into soil covered by litter than into bare soil. In a dry year (c. 300 mm rainfall) seasonal above ground herbaceous production varied from c. 0-25 t ha-' in areas of intensive use to c. 1 t ha- in areas of light use. In a wet season (c. 600 mm rainfall) production for the same areas was c. 1.2 t ha- and 2 t ha- , respectively. Protein content of swards dominated by annual grasses remained high throughout the season, never dropping below c. 9%, whil... Mostrar Tudo |
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Palavras-Chave: |
Uso. |
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Thesagro: |
Ecologia; Solo. |
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Thesaurus Nal: |
Ecological soil types; Land use; Semiarid soils. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 03480naa a2200205 a 4500
001 1521965
005 2023-11-28
008 1976 bl uuuu u00u1 u #d
100 1 $aKELLY, R. D.
245 $aThe effects of different forms of land use on the ecology of a Semi-Arid region in South-Eastern Rhodesia.$h[electronic resource]
260 $c1976
520 $aA study was made in 1970-2 of the effects of four different utilization reg vegetation ('lowveld') on shallow basalt soils in Rhodesia. These were light utilization by wild herbivores, moderate utilization by cattle and int by cattle and goats. Total above-ground standing crop of shrubs and trees varied betwe utilization) and 9 t ha- (intensive utilization). The seasonal productio and twigs varied from 2 t ha-' (nil utilization) to 0-6 t ha-' (intensi Most of the differences in the herbaceous vegetation attributable to uti result of the intensity of use rather than the different species of herbiv was dominated by annual grasses in intensively utilized areas and by p in areas of light and moderate utilization. The areas dominated characterized by large fluctuations in above-ground seasons (up to 400% change) in response to rainfall, whil in the swards dominated by perennials (c. 100%). Differe 68%, respectively, in areas of intensive, moderate and li on infiltration of rainfall since water was found to infiltrate nine times faster into soil covered by litter than into bare soil. In a dry year (c. 300 mm rainfall) seasonal above ground herbaceous production varied from c. 0-25 t ha-' in areas of intensive use to c. 1 t ha- in areas of light use. In a wet season (c. 600 mm rainfall) production for the same areas was c. 1.2 t ha- and 2 t ha- , respectively. Protein content of swards dominated by annual grasses remained high throughout the season, never dropping below c. 9%, while that of communities dominated by perennial grasses dropped from c. 12% in the early season to below 5% in the late season. However, total quantities of protein and other foodstuffs available were, at all times, much greater where utilization was moderate or light than where intensive. Continuous intensive use was resulting in all grasses in these areas being completely consumed during the growing season, leaving little or no herbage for the seven- or eight-month dry season. In areas dominated by perennial grasses, the large standing crop of forage, although not of very high nutritive quality, resulted in considerable quantities of herbage remaining for dry season consumption. The energy content of the herbaceous vegetation was 17 522 J g- (4185 kcal g- 1) and the efficiency of the herbaceous component of the vegetation in trapping radiant energy over the five-month growing season ranged from 0-01 to 0-06%. It was concluded that swards exhibiting the most desirable characteristics were those in areas of light and moderate use. In areas of non-use sward vigour was declining and the proportion of bare soil surface and scrub was increasing. Intensive utilization was resulting in a change in dominance from perennial to annual grasses, with increasing year to year fluctuations in seasonal production, a large proportion of bare soil and increasing run-off of rain-wat
650 $aEcological soil types
650 $aLand use
650 $aSemiarid soils
650 $aEcologia
650 $aSolo
653 $aUso
700 1 $aWALKER, B. H.
773 $tJournal of Ecology$gv. 64, n. 2, p. 553-576, Jul. 1976.
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| 161. |  | CLEMENTE, Z.; CASTRO, V. L. S. S. de; FEITOSA, L. O.; LIMA, R.; JONSSON, C. M.; MAIA, A. de H. N.; FRACETO, L. F. Fish exposure to nano-TiO2 under different experimental conditions: methodological aspects for nanoecotoxicology investigations. Science of the Total Environment, Amsterdam, v. 463-464, p. 647-656, 2013.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
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| 162. | | CASTRO, V. L. S. S. de; CLEMENTE, Z.; JONSSON, C. M.; SILVA, M. S. G. M. e; VALLIM, J. H.; MEDEIROS, A. M. Z.; MARTINEZ, D. S. T. Avaliação de risco ambiental estimado pela exposição ao óxido de grafeno. In: WORKSHOP DE NANOTECNOLOGIA APLICADA AO AGRONEGÓCIO, 9., 2017, São Carlos. Anais... São Carlos: Embrapa Instrumentação, 2017. p. 651-654.| Tipo: Artigo em Anais de Congresso |
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| 163. | | GIL, J. A.; DIAS, P. da S.; VALLIM, J. H.; BOMPADRE, T. F. V.; JONSSON, C. M.; CASTRO, V. L. S. S. de; ISHIKAWA, M. M. Avaliação do padrão de crescimento de larvas de Astyanax altiparanae (Garutti & Britski, 2000) expostos a diferentes concentrações de triclosan. In: CONGRESSO BRASILEIRO DE AQUICULTURA E BIOLOGIA AQUÁTICA, 10., 2023, Florianópolis. Anais eletrônicos... Florianópolis: UFSC, Aquabio, 2023.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 164. | | GIL, J. A.; DIAS, P. da S.; BOMPADRE, T. F. V.; QUEIROZ, J. F. de; JONSSON, C. M.; CASTRO, V. L. S. S. de; ISHIKAWA, M. M. Avaliação dos parâmetros hematológicos do Astyanax altiparanae (Garutti & Britski, 2000) expostos a diferentes concentrações de triclosan. In: CONGRESSO BRASILEIRO DE AQUICULTURA E BIOLOGIA AQUÁTICA, 10., 2023, Florianópolis. Anais eletrônicos... Florianópolis: UFSC, Aquabio, 2023.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 167. | | CLEMENTE, Z.; CASTRO, V. L. S. S. de; FEITOSA, L. O.; LIMA, R.; JONSSON, C. M.; MAIA, A. de H. N.; FRACETO, L. F. Biomarker evaluation in fish after prolonged exposure to nano-TiO2: influence of illumination conditions and crystal phase. Journal of Nanoscience and Nanotechnology, Stevenson Ranch, v. 15, n. 7., p. 5424-5433, 2015.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 168. | | SIQUEIRA, M. C.; AOUADA, M. R. M.; CASTRO, V. L. S. S. de; BRANDÃO, H. de M.; RECH, R. R.; MARCONCINI, J. M.; MATTOSO, L. H. C. Caracterização e avaliação da toxicidade de nanopartículas de prata para incorporação em matriz polimérica para uso em embalagens de alimentos. In: WORKSHOP DE NANOTECNOLOGIA APLICADA AO AGRONEGÓCIO, 7., 2013, São Carlos. Anais... São Carlos: Embrapa Instrumentação, 2013. p. 542-544.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 169. | | CLEMENTE, Z.; CASTRO, V. L. S. S. de; FEITOSA, L. O.; LIMA, R.; JONSSON, C. M.; MAIA, A. de H. N.; FRACETO, L. F. Crystal phase and illumination condition influence sublethal effects of nano-TiO2. In: THE BRITISH TOXICOLOGY SOCIETY SPRING CONGRESS, 2013, Birmingham. Abstracts... Birmingham: The British Toxicology Society, 2013. Ref. P024.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 170. | | GONÇALVES, S. P. C.; STRAUSS, M.; DELITE, F. S.; CLEMENTE, Z.; CASTRO, V. L. S. S. de; MARTINEZ, D. S. T. Avaliação da ecotoxicidade do carvão ativo modificado com nanopartícula de prata. In: SIMPÓSIO DE ECOTOXICOLOGIA, 3., 2016, Rio Claro. Anais... Rio Claro: Unesp, 2016. p. 89.| Tipo: Resumo em Anais de Congresso |
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| 174. | | COA, F.; CLEMENTE, Z.; LOPES, J. R.; RODRIGUES NETO, L. L.; CASTRO, V. L. S. S. de; BARBIERI, E.; MARTINEZ, D. S. T. Ecotoxicidade de nanotubos de carbono revestidos com ácido húmico sobre Daphnia magna. In: SIMPÓSIO DE ECOTOXICOLOGIA, 3., 2016, Rio Claro. Anais... Rio Claro: Unesp, 2016. p. 35.| Tipo: Resumo em Anais de Congresso |
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| 175. | | VALARINI, P. J.; NARDO, E. A. B. de; GOMES, M. A. F.; FERREIRA, C. J. A.; CASTRO, V. L. S. S. de. Dinâmica e efeitos de agrotóxicos no meio ambiente. In: FREIRE, F. das C. O.; CARDOSO, J. E.; VIANA, F. M. P. (Ed.). Doenças de fruteiras tropicais de interesse agroindustrial. Brasília, DF: Embrapa Informação Tecnológica; Fortaleza: Embrapa Agroindústria Tropical, 2003. 687 p. p. 625-687.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 176. | | PELEGRINI, M. D. B; GUIMARÃES, M.; PAULA, V. J. de; CASTRO, V. L. S. S. de; JONSSON, C. M.; DAMIANE, C. Efeito de inseticidas usados na aquicultura sobre a atividade enzimática de organismos aquáticos bioindicadores. In: CONGRESSO INTERINSTITUCIONAL DE INICIAÇÃO CIENTÍFICA, 5., 2011, Campinas. Anais... Campinas: Embrapa Monitoramento por Satélite, 2011. 1 CD ROM.| Tipo: Artigo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 177. | | JONSSON, C. M.; CLEMENTE, Z.; CASTRO, V. L. S. S. de; CASTANHA, R. F.; VALLIM, J. H.; DOMINGOS, N.; BLUMEL, S. Effects of graphene oxide on aquatic macrophyte under the influence of humic substances. In: SETAC EUROPE ANNUAL MEETING, 26., 2016, Nantes. Proceedings... Brussels: SETAC, 2016. Ref. TU038. p. 201-202.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| 178. | | BECARO, A. A.; OLIVEIRA, L. P. de; CASTRO, V. L. S. S. de; SIQUEIRA, M. C.; BRANDAO, H. de M.; CORREA, D. S.; FERREIRA, M. D. Effects of silver nanoparticles prenatal exposure on rat offspring development. Environmental Toxicology and Pharmacology, v. 81, article 103546, 2021.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
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| 179. | | JESUS-HITZSCHKY, K. R. E. de; MASSINI, K. C.; ASSIS, O. B. G. de; CARNIEL, B. F.; CASTRO, V. L. S. S. de. Indicadores de impactos como diretrizes para a regulamentação das liberações das nanotecnologias no meio ambiente. In: SEMINÁRIO INTERNACIONAL DE NANOTECNOLOGIA, SOCIEDADE E MEIO AMBIENTE, 7., 2010, Rio de Janeiro. Resumos... Rio de Janeiro: FIOCRUZ, 2010.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| Registros recuperados : 212 | |
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