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Registro Completo |
Biblioteca(s): |
Embrapa Meio Ambiente. |
Data corrente: |
16/03/2012 |
Data da última atualização: |
16/03/2012 |
Tipo da produção científica: |
Artigo em Anais de Congresso |
Autoria: |
COSTA, C. F. G.; FIGUEIREDO, R. de O.; SANTOS, I. P. de O. |
Afiliação: |
CRISTIANE FORMIGOSA GADELHA DA COSTA, UFRA; RICARDO DE OLIVEIRA FIGUEIREDO, CNPMA; IZABELA PENHA DE OLIVEIRA SANTOS, UEPA. |
Título: |
Influência do uso da terra no Nordeste Paraense sobre indicadores físico-químicos de qualidade da água do escoamento superficial no solo. |
Ano de publicação: |
2011 |
Fonte/Imprenta: |
In: SIMPÓSIO BRASILEIRO DE RECURSOS HÍDRICOS, 19., 2011, Maceió. Anais... Maceió: Associação Brasileira de Recursos Hidricos, 2011. 15p. |
Idioma: |
Português |
Conteúdo: |
RESUMO: O presente trabalho teve como objetivo caracterizar a hidrogeoquímica do escoamento superficial em solos de diferentes ecossistemas, na mesobacia dos igarapés contíguos Timboteua e Buiuna (afluentes do rio Marapanim) no nordeste paraense, monitorando-se duas variáveis físicoquímicas da água (condutividade elétrica e pH). Foram alocadas três parcelas experimentais (1m2) em seis ecossistemas, sob mesmas condições biofísicas de solo e clima, totalizando 18 parcelas de tratamento. Instalaram-se também na mesma bacia três coletores de água de chuva e dois pluviômetros. No período de janeiro a junho de 2010, foram coletadas 234 amostras água de chuva e de escoamento superficial. O pH apresentou-se mais ácido nas amostras de água da chuva, seguido pela Capoeira e Sistema Agroflorestal (com preparo por derruba-e-queima), que pode estar relacionado à concentração de material orgânico em decomposição. Os agroecossistemas Roça (derruba-e-queima), Sistema Agroflorestal (com preparo por corte-e-trituração) e Pastagem se destacaram apresentando os maiores valores de condutividade elétrica (CE). O manejo do solo parece influenciar a CE e o pH. Abstract: The objective of this study was to characterize the hydrogeochemistry of the overland flow, in the watershed of the Timboteua and Buiuna streams (tributaries of the Marapanim River), Northeast of Pará, through measurements of two physico-chemical variables of water (electrical conductivity and pH). It was placed three experimental plots (1m2) in each six ecosystems, under the same biophysical conditions of soil and climate, summing up 18 treatment plots. It was also installed three rainwater collectors and two rain gauges in the same watershed. In the period January to June/ 2010, it was collected 234 rainwater and overland flow samples. The pH was more acidic in rainwater samples, followed by Capoeira and agroforestry system (prepared by slash-and-burn) overland flow samples, what may be related to the soil organic matter decomposition. Agroecosystems (slash-and-burn), Agroforestry system (chop-and-mulch) and Pasture overland flow were distinguished by higher electrical conductivity (EC). Soil management seems to influence both EC and pH. MenosRESUMO: O presente trabalho teve como objetivo caracterizar a hidrogeoquímica do escoamento superficial em solos de diferentes ecossistemas, na mesobacia dos igarapés contíguos Timboteua e Buiuna (afluentes do rio Marapanim) no nordeste paraense, monitorando-se duas variáveis físicoquímicas da água (condutividade elétrica e pH). Foram alocadas três parcelas experimentais (1m2) em seis ecossistemas, sob mesmas condições biofísicas de solo e clima, totalizando 18 parcelas de tratamento. Instalaram-se também na mesma bacia três coletores de água de chuva e dois pluviômetros. No período de janeiro a junho de 2010, foram coletadas 234 amostras água de chuva e de escoamento superficial. O pH apresentou-se mais ácido nas amostras de água da chuva, seguido pela Capoeira e Sistema Agroflorestal (com preparo por derruba-e-queima), que pode estar relacionado à concentração de material orgânico em decomposição. Os agroecossistemas Roça (derruba-e-queima), Sistema Agroflorestal (com preparo por corte-e-trituração) e Pastagem se destacaram apresentando os maiores valores de condutividade elétrica (CE). O manejo do solo parece influenciar a CE e o pH. Abstract: The objective of this study was to characterize the hydrogeochemistry of the overland flow, in the watershed of the Timboteua and Buiuna streams (tributaries of the Marapanim River), Northeast of Pará, through measurements of two physico-chemical variables of water (electrical conductivity and pH). It was placed three experimental p... Mostrar Tudo |
Palavras-Chave: |
Ecossistemas; Hidrogeoquímica; Mesobacia. |
Thesagro: |
Água; Bacia hidrográfica; Condutividade elétrica; Escoamento; Qualidade da água; Solo; Uso da terra. |
Thesaurus Nal: |
Land use; Water quality; Watersheds. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/55911/1/2011AA81.pdf
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Marc: |
LEADER 03221nam a2200289 a 4500 001 1919208 005 2012-03-16 008 2011 bl uuuu u00u1 u #d 100 1 $aCOSTA, C. F. G. 245 $aInfluência do uso da terra no Nordeste Paraense sobre indicadores físico-químicos de qualidade da água do escoamento superficial no solo.$h[electronic resource] 260 $aIn: SIMPÓSIO BRASILEIRO DE RECURSOS HÍDRICOS, 19., 2011, Maceió. Anais... Maceió: Associação Brasileira de Recursos Hidricos, 2011. 15p.$c2011 520 $aRESUMO: O presente trabalho teve como objetivo caracterizar a hidrogeoquímica do escoamento superficial em solos de diferentes ecossistemas, na mesobacia dos igarapés contíguos Timboteua e Buiuna (afluentes do rio Marapanim) no nordeste paraense, monitorando-se duas variáveis físicoquímicas da água (condutividade elétrica e pH). Foram alocadas três parcelas experimentais (1m2) em seis ecossistemas, sob mesmas condições biofísicas de solo e clima, totalizando 18 parcelas de tratamento. Instalaram-se também na mesma bacia três coletores de água de chuva e dois pluviômetros. No período de janeiro a junho de 2010, foram coletadas 234 amostras água de chuva e de escoamento superficial. O pH apresentou-se mais ácido nas amostras de água da chuva, seguido pela Capoeira e Sistema Agroflorestal (com preparo por derruba-e-queima), que pode estar relacionado à concentração de material orgânico em decomposição. Os agroecossistemas Roça (derruba-e-queima), Sistema Agroflorestal (com preparo por corte-e-trituração) e Pastagem se destacaram apresentando os maiores valores de condutividade elétrica (CE). O manejo do solo parece influenciar a CE e o pH. Abstract: The objective of this study was to characterize the hydrogeochemistry of the overland flow, in the watershed of the Timboteua and Buiuna streams (tributaries of the Marapanim River), Northeast of Pará, through measurements of two physico-chemical variables of water (electrical conductivity and pH). It was placed three experimental plots (1m2) in each six ecosystems, under the same biophysical conditions of soil and climate, summing up 18 treatment plots. It was also installed three rainwater collectors and two rain gauges in the same watershed. In the period January to June/ 2010, it was collected 234 rainwater and overland flow samples. The pH was more acidic in rainwater samples, followed by Capoeira and agroforestry system (prepared by slash-and-burn) overland flow samples, what may be related to the soil organic matter decomposition. Agroecosystems (slash-and-burn), Agroforestry system (chop-and-mulch) and Pasture overland flow were distinguished by higher electrical conductivity (EC). Soil management seems to influence both EC and pH. 650 $aLand use 650 $aWater quality 650 $aWatersheds 650 $aÁgua 650 $aBacia hidrográfica 650 $aCondutividade elétrica 650 $aEscoamento 650 $aQualidade da água 650 $aSolo 650 $aUso da terra 653 $aEcossistemas 653 $aHidrogeoquímica 653 $aMesobacia 700 1 $aFIGUEIREDO, R. de O. 700 1 $aSANTOS, I. P. de O.
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Embrapa Meio Ambiente (CNPMA) |
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Registro Completo
Biblioteca(s): |
Embrapa Amazônia Oriental. |
Data corrente: |
01/12/2023 |
Data da última atualização: |
01/12/2023 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
A - 1 |
Autoria: |
ABRELL, T.; NAUDIN, K.; BIANCHI, F. J. J. A.; ARAGAO, D. V.; TITTONELL, P.; CORBEELS, M. |
Afiliação: |
THOMAS ABRELL, CENTRE DE COOPÉRATION INTERNATIONALE EN RECHERCHE AGRONOMIQUE POUR LE DÉVELOPPEMENT; KRISHNA NAUDIN, CENTRE DE COOPÉRATION INTERNATIONALE EN RECHERCHE AGRONOMIQUE POUR LE DÉVELOPPEMENT; FELIX J. J. A. BIANCHI, WAGENINGEN UNIVERSITY AND RESEARCH; DEBORA VEIGA DE ARAGAO, CPATU; PABLO TITTONELL, CENTRE DE COOPÉRATION INTERNATIONALE EN RECHERCHE AGRONOMIQUE POUR LE DÉVELOPPEMENT; MARC CORBEELS, CENTRE DE COOPÉRATION INTERNATIONALE EN RECHERCHE AGRONOMIQUE POUR LE DÉVELOPPEMENT. |
Título: |
Shifting cultivation in decline: An analysis of soil fertility and weed pressure in intensified cropping systems in Eastern Amazon. |
Ano de publicação: |
2024 |
Fonte/Imprenta: |
Agriculture, Ecosystems and Environment, v. 360, 108793, 2024. |
DOI: |
https://doi.org/10.1016/j.agee.2023.108793 |
Idioma: |
Inglês |
Conteúdo: |
Reconciling forest preservation and agricultural production is a major challenge. In Brazil, environmental laws have been introduced to reduce forest degradation associated with the expansion of agriculture. However, these laws are constraining small-scale family farmers who rely on cassava produced in shifting cultivation. Faced by scarcity of land, farmers are reducing the fallow periods on their farms. In this study, our hypothesis was that the reduction of the fallow period in shifting cultivation systems leads to a depletion of soil fertility and an increase in weed pressure. In the Brazilian Eastern Amazon region, soil fertility and weed infestation indicators were assessed in 36 cassava fields under shifting cultivation with different land-use histories. The frequency of cultivation of the fields in the past 10 years ranged from 1 to 7 and averaged 3.7 ± 2.3. The results show that the most frequently cultivated fields had lower soil fertility, indicated by lower soil organic carbon, total nitrogen and exchangeable potassium and pH. In addition, labor input for weeding and weeding frequency increased with the frequency of cultivation of the fields, indicating that weed pressure increased with intensified crop cultivation and shorter fallow periods. The findings of this study make clear that the current trend of reducing the fallow period in the Eastern Amazon is a threat to the sustainability and productivity of the local shifting cultivation systems. There is an urgent need for alternative production systems that allow for a better weed control and that contribute to restoring and maintaining soil fertility. MenosReconciling forest preservation and agricultural production is a major challenge. In Brazil, environmental laws have been introduced to reduce forest degradation associated with the expansion of agriculture. However, these laws are constraining small-scale family farmers who rely on cassava produced in shifting cultivation. Faced by scarcity of land, farmers are reducing the fallow periods on their farms. In this study, our hypothesis was that the reduction of the fallow period in shifting cultivation systems leads to a depletion of soil fertility and an increase in weed pressure. In the Brazilian Eastern Amazon region, soil fertility and weed infestation indicators were assessed in 36 cassava fields under shifting cultivation with different land-use histories. The frequency of cultivation of the fields in the past 10 years ranged from 1 to 7 and averaged 3.7 ± 2.3. The results show that the most frequently cultivated fields had lower soil fertility, indicated by lower soil organic carbon, total nitrogen and exchangeable potassium and pH. In addition, labor input for weeding and weeding frequency increased with the frequency of cultivation of the fields, indicating that weed pressure increased with intensified crop cultivation and shorter fallow periods. The findings of this study make clear that the current trend of reducing the fallow period in the Eastern Amazon is a threat to the sustainability and productivity of the local shifting cultivation systems. There is an urgen... Mostrar Tudo |
Palavras-Chave: |
Produção sustentável; Sustainable production. |
Thesagro: |
Conservação do Solo; Erva Daninha; Fertilidade do Solo; Mandioca. |
Thesaurus NAL: |
Cassava; Soil conservation; Weed control. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
Marc: |
LEADER 02591naa a2200301 a 4500 001 2158999 005 2023-12-01 008 2024 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.1016/j.agee.2023.108793$2DOI 100 1 $aABRELL, T. 245 $aShifting cultivation in decline$bAn analysis of soil fertility and weed pressure in intensified cropping systems in Eastern Amazon.$h[electronic resource] 260 $c2024 520 $aReconciling forest preservation and agricultural production is a major challenge. In Brazil, environmental laws have been introduced to reduce forest degradation associated with the expansion of agriculture. However, these laws are constraining small-scale family farmers who rely on cassava produced in shifting cultivation. Faced by scarcity of land, farmers are reducing the fallow periods on their farms. In this study, our hypothesis was that the reduction of the fallow period in shifting cultivation systems leads to a depletion of soil fertility and an increase in weed pressure. In the Brazilian Eastern Amazon region, soil fertility and weed infestation indicators were assessed in 36 cassava fields under shifting cultivation with different land-use histories. The frequency of cultivation of the fields in the past 10 years ranged from 1 to 7 and averaged 3.7 ± 2.3. The results show that the most frequently cultivated fields had lower soil fertility, indicated by lower soil organic carbon, total nitrogen and exchangeable potassium and pH. In addition, labor input for weeding and weeding frequency increased with the frequency of cultivation of the fields, indicating that weed pressure increased with intensified crop cultivation and shorter fallow periods. The findings of this study make clear that the current trend of reducing the fallow period in the Eastern Amazon is a threat to the sustainability and productivity of the local shifting cultivation systems. There is an urgent need for alternative production systems that allow for a better weed control and that contribute to restoring and maintaining soil fertility. 650 $aCassava 650 $aSoil conservation 650 $aWeed control 650 $aConservação do Solo 650 $aErva Daninha 650 $aFertilidade do Solo 650 $aMandioca 653 $aProdução sustentável 653 $aSustainable production 700 1 $aNAUDIN, K. 700 1 $aBIANCHI, F. J. J. A. 700 1 $aARAGAO, D. V. 700 1 $aTITTONELL, P. 700 1 $aCORBEELS, M. 773 $tAgriculture, Ecosystems and Environment$gv. 360, 108793, 2024.
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