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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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| 1. |  | ZALESKI, S. R. M.; FRENSCH, G.; MARQUES, F. de A.; LAZZARI, S. M. N.; IEDE, E. T.; MAIA, B. H. L. N. S.; TROGLER, A.; FRANCKE, W. Resposta olfativa de Pissodes castaneus (Coleoptera, Curculionidae) a odores de seus co-específicos e da planta hospedeira. In: CONGRESSO BRASILEIRO DE ENTOMOLOGIA, 22., 2008, Uberlândia. Ciência, tecnologia e inovação: resumos... Uberlândia: Sociedade Entomológica do Brasil, 2008. 1 CD-ROM.| Tipo: Resumo em Anais de Congresso |
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