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| Registros recuperados : 3 | |
| 2. |  | KOMIYA, S.; ARAUJO, A. C. de; LAVRIC, J. V.; NELSON, B.; SÖRGEL, M.; WEBER, B.; BOTIA, S.; GOMES-ALVES, E.; WALTER, D.; SÁ, M. de O.; WOLFF, S.; PINHO, D. M.; KONDO, F.; TRUMBORE, S. Seasonal and interannual variations of carbon fluxes at the Amazon Tall Tower Observatory site in 2014-2019. In: EGU GENERAL ASSEMBLY, 2022, Viena. Programme. [S.l.]: EGU, 2022.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| 3. | | ASPEREN, H. V.; WARNEKE, T.; ARAUJO, A. C. de; FORSBERG, B.; FERREIRA, S.; ALVES-OLIVEIRA, J.; OLIVEIRA, L. R. de; XAVIER, T. de L.; SÁ, M.; TEIXEIRA, P.; PIRES, E.; MOURA, V.; KOMIYA, S.; BOTIA, S.; JONES, S.; LAVRIČ, J.; TRUMBORE, S.; NOTHOLT, J. Tropical forest CH4 budget: the importance of local hotspots In: EGU GENERAL ASSEMBLY, 2022, Viena. Programme. [S.l.]: EGU, 2022.| Biblioteca(s): Embrapa Amazônia Oriental. |
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| Registros recuperados : 3 | |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
10/11/1997 |
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Data da última atualização: |
27/01/2023 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
HÖLSCHER, D.; MOLLER, M. R. F.; DENICH, M.; FÖLSTER, H. |
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Afiliação: |
D. HÖLSCHER, UNIVERSITY OF GÖTTINGEN; MARIA REGINA FREIRE MOLLER, CPATU; M. DENICH, UNIVERSITY OF GÖTTINGEN; H. FÖLSTER, UNIVERSITY OF GÖTTINGEN. |
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Título: |
Nutrient input-output budget of shifting agriculture in Eastern Amazonia. |
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Ano de publicação: |
1997 |
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Fonte/Imprenta: |
Nutrient Cycling in Agroecosystems, v. 47, n. 1, p. 49-57, 1997. |
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DOI: |
https://doi.org/10.1007/BF01985718 |
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Idioma: |
Inglês |
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Conteúdo: |
A case study on the nutrient input-output budget of slash and burn agriculture was carried out in Northeast-Pará, Brazil, where such a land-use system has been practised for about 100 years. A common cropping period lasts for two years and the fields lie fallow for 4 to 8 years. We quantified rates of deposition, fertilization, and losses due to the burn, harvest and leaching. Six fields of different phases in the rotational cycle were under study during a 19 month period. During the fallow period, the input of Na, K, Mg, N, P and S via deposition exceeded the estimated losses with the seepage water. The Ca budget was almost balanced. The balance of fields in the transition from the fallow to the cropping phase was negative for Na, K, Ca, Mg, N, and S. The P balance was positive when NPK fertilizer was applied, and negative without fertilizer application. The nutrient balance for K, Mg, Ca, N, and P was also negative on the field in transition from the cropping to the fallow period. The nutrient budget for an entire land-use cycle of 9 years was estimated by the "false time series approach". In the case of an NPK fertilization during the cropping period there were net losses of 75 kg K ha?1, 125 kg Ca ha?1, 16 kg Mg ha?1, 285 kg N ha'1 and 13 kg S ha'1. Na (86 kg ha'1) and P (11 kg ha?1) were accumulated. The harvest was the most important flux for the K (61%) and P (62%) output. The element transfer into the atmosphere during the burn caused the main losses of N (60%), S (65%), Ca (58%) and Mg (41%). The most important path of Na loss was leaching (92%). The net K losses were severe as they represented 45% of the K store found extractable in the soil down to 1m depth and in the above ground biomass. The presented results may be useful in planning a sustainable and environmentally protective method of land-use within a shifting cultivation system. It is strongly recommended that slash burning be abandoned in order to keep the nutrients in the ecosystem. MenosA case study on the nutrient input-output budget of slash and burn agriculture was carried out in Northeast-Pará, Brazil, where such a land-use system has been practised for about 100 years. A common cropping period lasts for two years and the fields lie fallow for 4 to 8 years. We quantified rates of deposition, fertilization, and losses due to the burn, harvest and leaching. Six fields of different phases in the rotational cycle were under study during a 19 month period. During the fallow period, the input of Na, K, Mg, N, P and S via deposition exceeded the estimated losses with the seepage water. The Ca budget was almost balanced. The balance of fields in the transition from the fallow to the cropping phase was negative for Na, K, Ca, Mg, N, and S. The P balance was positive when NPK fertilizer was applied, and negative without fertilizer application. The nutrient balance for K, Mg, Ca, N, and P was also negative on the field in transition from the cropping to the fallow period. The nutrient budget for an entire land-use cycle of 9 years was estimated by the "false time series approach". In the case of an NPK fertilization during the cropping period there were net losses of 75 kg K ha?1, 125 kg Ca ha?1, 16 kg Mg ha?1, 285 kg N ha'1 and 13 kg S ha'1. Na (86 kg ha'1) and P (11 kg ha?1) were accumulated. The harvest was the most important flux for the K (61%) and P (62%) output. The element transfer into the atmosphere during the burn caused the main losses of N (60%), S (6... Mostrar Tudo |
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Palavras-Chave: |
Brasil; Ciclagem de nutriente; Cycling; Pará; Zona Bragantina. |
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Thesagro: |
Cultivo Migratório; Uso da Terra. |
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Thesaurus NAL: |
Amazonia; land use; shifting cultivation. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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Marc: |
LEADER 02808naa a2200289 a 4500
001 1397796
005 2023-01-27
008 1997 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/BF01985718$2DOI
100 1 $aHÖLSCHER, D.
245 $aNutrient input-output budget of shifting agriculture in Eastern Amazonia.$h[electronic resource]
260 $c1997
520 $aA case study on the nutrient input-output budget of slash and burn agriculture was carried out in Northeast-Pará, Brazil, where such a land-use system has been practised for about 100 years. A common cropping period lasts for two years and the fields lie fallow for 4 to 8 years. We quantified rates of deposition, fertilization, and losses due to the burn, harvest and leaching. Six fields of different phases in the rotational cycle were under study during a 19 month period. During the fallow period, the input of Na, K, Mg, N, P and S via deposition exceeded the estimated losses with the seepage water. The Ca budget was almost balanced. The balance of fields in the transition from the fallow to the cropping phase was negative for Na, K, Ca, Mg, N, and S. The P balance was positive when NPK fertilizer was applied, and negative without fertilizer application. The nutrient balance for K, Mg, Ca, N, and P was also negative on the field in transition from the cropping to the fallow period. The nutrient budget for an entire land-use cycle of 9 years was estimated by the "false time series approach". In the case of an NPK fertilization during the cropping period there were net losses of 75 kg K ha?1, 125 kg Ca ha?1, 16 kg Mg ha?1, 285 kg N ha'1 and 13 kg S ha'1. Na (86 kg ha'1) and P (11 kg ha?1) were accumulated. The harvest was the most important flux for the K (61%) and P (62%) output. The element transfer into the atmosphere during the burn caused the main losses of N (60%), S (65%), Ca (58%) and Mg (41%). The most important path of Na loss was leaching (92%). The net K losses were severe as they represented 45% of the K store found extractable in the soil down to 1m depth and in the above ground biomass. The presented results may be useful in planning a sustainable and environmentally protective method of land-use within a shifting cultivation system. It is strongly recommended that slash burning be abandoned in order to keep the nutrients in the ecosystem.
650 $aAmazonia
650 $aland use
650 $ashifting cultivation
650 $aCultivo Migratório
650 $aUso da Terra
653 $aBrasil
653 $aCiclagem de nutriente
653 $aCycling
653 $aPará
653 $aZona Bragantina
700 1 $aMOLLER, M. R. F.
700 1 $aDENICH, M.
700 1 $aFÖLSTER, H.
773 $tNutrient Cycling in Agroecosystems$gv. 47, n. 1, p. 49-57, 1997.
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