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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
14/07/1997 |
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Data da última atualização: |
31/03/2017 |
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Autoria: |
PARIKESIT, P.; LARSON, D. W.; MATTHES-SEARS, U. |
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Título: |
Impacts of trails on cliff-edge forest structure. |
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Ano de publicação: |
1995 |
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Fonte/Imprenta: |
Canadian Journal of Botany, v.73, n.6, p.943-953, 1995. |
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Idioma: |
Inglês |
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Conteúdo: |
Plant community structure and soil characteristics were quantitatively studied along forested cliff edges of the Niagara Escarpment in southern Ontario, Canada. The objetive of the study was to try to differentiate between the effects of two gradients on vegetation structure: the environmental gradient between the cliff edge and dense forest, and and anthroponic gradient, generated by the presence of major hiking trails parallel to the cliff edges. Species frequencies were determined along 69 transects distributed over eight sites with different amounts of past and present trampling disturbance. The data were analyzed using cluster and ordination analysis as well as analyses of variance. The results showed that soil characteristics were the major influence organizing the vegetation of clif-edge forests and that soil properties and plant community structure were more strongly influenced by anthropogenic factors than by the environmental gradient between cliff edge and forest. Trampled plots had some properties in common with cliff-edge plots. Species richness was highest at intemediate trai-use levels; abandonment of heavily disturbed trails resulted in the restoration of species richness, but most new colonizing plants were disturbance-tolerant ruderals. Soil properties did not completely recover even after 10 years of trail abandonment. The results suggest that the current use of cliff edges along the Niagara Escarpment is nonsustainable,a and reversing its effects on cliff-edge forest structure may take a considerable amount of time. MenosPlant community structure and soil characteristics were quantitatively studied along forested cliff edges of the Niagara Escarpment in southern Ontario, Canada. The objetive of the study was to try to differentiate between the effects of two gradients on vegetation structure: the environmental gradient between the cliff edge and dense forest, and and anthroponic gradient, generated by the presence of major hiking trails parallel to the cliff edges. Species frequencies were determined along 69 transects distributed over eight sites with different amounts of past and present trampling disturbance. The data were analyzed using cluster and ordination analysis as well as analyses of variance. The results showed that soil characteristics were the major influence organizing the vegetation of clif-edge forests and that soil properties and plant community structure were more strongly influenced by anthropogenic factors than by the environmental gradient between cliff edge and forest. Trampled plots had some properties in common with cliff-edge plots. Species richness was highest at intemediate trai-use levels; abandonment of heavily disturbed trails resulted in the restoration of species richness, but most new colonizing plants were disturbance-tolerant ruderals. Soil properties did not completely recover even after 10 years of trail abandonment. The results suggest that the current use of cliff edges along the Niagara Escarpment is nonsustainable,a and reversing its effects on cliff... Mostrar Tudo |
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Palavras-Chave: |
Analise de grupo; Disturbance; Estrutura da comunidade; Niagara Escarpment; Ordenacao; Ordination; Perturbacao; Plant community ecology; Trampling. |
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Thesagro: |
Ecologia Vegetal. |
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Thesaurus Nal: |
Canada; cluster analysis. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02325naa a2200289 a 4500
001 1791308
005 2017-03-31
008 1995 bl --- 0-- u #d
100 1 $aPARIKESIT, P.
245 $aImpacts of trails on cliff-edge forest structure.
260 $c1995
520 $aPlant community structure and soil characteristics were quantitatively studied along forested cliff edges of the Niagara Escarpment in southern Ontario, Canada. The objetive of the study was to try to differentiate between the effects of two gradients on vegetation structure: the environmental gradient between the cliff edge and dense forest, and and anthroponic gradient, generated by the presence of major hiking trails parallel to the cliff edges. Species frequencies were determined along 69 transects distributed over eight sites with different amounts of past and present trampling disturbance. The data were analyzed using cluster and ordination analysis as well as analyses of variance. The results showed that soil characteristics were the major influence organizing the vegetation of clif-edge forests and that soil properties and plant community structure were more strongly influenced by anthropogenic factors than by the environmental gradient between cliff edge and forest. Trampled plots had some properties in common with cliff-edge plots. Species richness was highest at intemediate trai-use levels; abandonment of heavily disturbed trails resulted in the restoration of species richness, but most new colonizing plants were disturbance-tolerant ruderals. Soil properties did not completely recover even after 10 years of trail abandonment. The results suggest that the current use of cliff edges along the Niagara Escarpment is nonsustainable,a and reversing its effects on cliff-edge forest structure may take a considerable amount of time.
650 $aCanada
650 $acluster analysis
650 $aEcologia Vegetal
653 $aAnalise de grupo
653 $aDisturbance
653 $aEstrutura da comunidade
653 $aNiagara Escarpment
653 $aOrdenacao
653 $aOrdination
653 $aPerturbacao
653 $aPlant community ecology
653 $aTrampling
700 1 $aLARSON, D. W.
700 1 $aMATTHES-SEARS, U.
773 $tCanadian Journal of Botany$gv.73, n.6, p.943-953, 1995.
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Registro original: |
Embrapa Pantanal (CPAP) |
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Biblioteca(s): |
Embrapa Milho e Sorgo. |
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Data corrente: |
14/04/2020 |
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Data da última atualização: |
26/10/2020 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Circulação/Nível: |
A - 2 |
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Autoria: |
MOREIRA, S. G.; KIEHL, J. de C.; PROCHNOW, L. I.; PAULETTI, V.; MARTIN NETO, L.; RESENDE, A. V. de. |
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Afiliação: |
Silvino Guimarães Moreira, Universidade Federal de Lavras; Jorge de Castro Kiehl, Escola Superior de Agricultura "Luiz de Queiroz"; Luís Ignácio Prochnow, International Plant Nutrition Institute; Volnei Pauletti, Universidade Federal do Paraná; LADISLAU MARTIN NETO, CNPDIA; ALVARO VILELA DE RESENDE, CNPMS. |
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Título: |
Soybean macronutrient availability and yield as affected by tillage system. |
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Ano de publicação: |
2020 |
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Fonte/Imprenta: |
Acta Scientiarum. Agronomy, v. 42, e42973, 2020. |
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Idioma: |
Inglês |
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Conteúdo: |
The effect of tillage system (NT-no tillage; CT-conventional tillage; MT-minimum tillage; and NT/scarification, every three years) on soybean nutrient availability and yield was evaluated on Oxisol after 12 years of cultivation. Soil samples were collected at depths of 0.00-0.05, 0.05-0.10, and 0.10-0.20 m and were analyzed for P, K, Ca, Mg, carbon (C), organic matter (OM), pH value, potential CEC, base saturation (BS%), and number of semiquinone organic radicals. The macronutrient concentration in the leaves and amount accumulated in the plants at the blooming stage were determined, as well as the yield of the two soybean crops. The soil pH value, BS% and K, Ca, and Mg concentrations were not influenced by the tillage system. The soil P and OM in the surface layer, however, were inversely proportional to the intensity of soil preparation. The P content in the soil surface layer under NT was twice as high as that of soil under CT. The P content in the soybean leaves under NT was also higher compared to that in the plants under CT and MT. The number of semiquinone radicals was low in the soil surface layer under NT, indicating a small degree of humification. However, soybean yield was not affected by the tillage system. |
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Thesagro: |
Matéria Orgânica; Plantio Direto; Sistema de Cultivo; Soja; Solo. |
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Categoria do assunto: |
A Sistemas de Cultivo |
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URL: |
https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/1121634/1/Soybeanmacronutrient.pdf
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Marc: |
LEADER 01911naa a2200241 a 4500
001 2121634
005 2020-10-26
008 2020 bl uuuu u00u1 u #d
100 1 $aMOREIRA, S. G.
245 $aSoybean macronutrient availability and yield as affected by tillage system.$h[electronic resource]
260 $c2020
520 $aThe effect of tillage system (NT-no tillage; CT-conventional tillage; MT-minimum tillage; and NT/scarification, every three years) on soybean nutrient availability and yield was evaluated on Oxisol after 12 years of cultivation. Soil samples were collected at depths of 0.00-0.05, 0.05-0.10, and 0.10-0.20 m and were analyzed for P, K, Ca, Mg, carbon (C), organic matter (OM), pH value, potential CEC, base saturation (BS%), and number of semiquinone organic radicals. The macronutrient concentration in the leaves and amount accumulated in the plants at the blooming stage were determined, as well as the yield of the two soybean crops. The soil pH value, BS% and K, Ca, and Mg concentrations were not influenced by the tillage system. The soil P and OM in the surface layer, however, were inversely proportional to the intensity of soil preparation. The P content in the soil surface layer under NT was twice as high as that of soil under CT. The P content in the soybean leaves under NT was also higher compared to that in the plants under CT and MT. The number of semiquinone radicals was low in the soil surface layer under NT, indicating a small degree of humification. However, soybean yield was not affected by the tillage system.
650 $aMatéria Orgânica
650 $aPlantio Direto
650 $aSistema de Cultivo
650 $aSoja
650 $aSolo
700 1 $aKIEHL, J. de C.
700 1 $aPROCHNOW, L. I.
700 1 $aPAULETTI, V.
700 1 $aMARTIN NETO, L.
700 1 $aRESENDE, A. V. de
773 $tActa Scientiarum. Agronomy$gv. 42, e42973, 2020.
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Embrapa Milho e Sorgo (CNPMS) |
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