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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
11/09/1997 |
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Data da última atualização: |
05/04/2017 |
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Autoria: |
PERRY, D. A.; BORCHERS, J. G.; TURNER, D. P.; GREGORY, S. V.; PERRY, C. R.; DIXON, R. K.; HART, S. C.; KAUFFMAN, B.; NEILSON, R. P.; SOLLINS, P. |
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Título: |
Biological feebacks to climate change: terrestrial ecosystems as sinks and sources of carbon and nitrogen. |
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Ano de publicação: |
1991 |
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Fonte/Imprenta: |
Northwest Environmental Journal, v.7, n.2, p.203-232, 1991. |
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Idioma: |
Inglês |
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Conteúdo: |
The major effect of vegetation on carbon fluxes to and from the atmosphere will be reorganization and redistribution of forests due to disturbance and migration. Because they store the bulk of terrestrial carbon, forests will play a key role. Boreal forests could extend onto current tundra, but only if precipitation increases enough to balance increased evapotranspiration. No plants excep weeds are likely to migrate fast enough to keep pace with climate change. Should frequency and severity of fire increase, as is predicted, northern forests are likely to become a source of CO2 to the atmosphere rather than a sink. Some models predict that tropical forests will expand, in which case they would be a strong sink for CO2; other models predict they will contract. However, when land-use practices are taken into account, tropical forests doubtless will contract regardless of wat happens with climate. Hence the tropics are much more lokely to be a CO2 sourcea rather than a sink. In terms of carbon fluxes, changes in terrestrial vegetation are more likely to significantly reinforce the greenhouse effect than to dampen it. The nitrogen released from accelerated decomposition of soil organic matter might stimulate forest productivity somewhat, but several lines of argument suggest that will not provide a significant negative feedback to warming. Amounts of nitrogen leached to streams could increase several-fold, increasing stream productivity. Should mountain forests become severely streassed, the resulting erosion would greatly increase sedimentation os stremas, rivers, and stuaries. Because the global ecosystem is complex, unpredicable, and subject to threshold changes that could be difficult or impossible to reverse, a "wait and see" attitude is not an appropriate response to impending climate change. MenosThe major effect of vegetation on carbon fluxes to and from the atmosphere will be reorganization and redistribution of forests due to disturbance and migration. Because they store the bulk of terrestrial carbon, forests will play a key role. Boreal forests could extend onto current tundra, but only if precipitation increases enough to balance increased evapotranspiration. No plants excep weeds are likely to migrate fast enough to keep pace with climate change. Should frequency and severity of fire increase, as is predicted, northern forests are likely to become a source of CO2 to the atmosphere rather than a sink. Some models predict that tropical forests will expand, in which case they would be a strong sink for CO2; other models predict they will contract. However, when land-use practices are taken into account, tropical forests doubtless will contract regardless of wat happens with climate. Hence the tropics are much more lokely to be a CO2 sourcea rather than a sink. In terms of carbon fluxes, changes in terrestrial vegetation are more likely to significantly reinforce the greenhouse effect than to dampen it. The nitrogen released from accelerated decomposition of soil organic matter might stimulate forest productivity somewhat, but several lines of argument suggest that will not provide a significant negative feedback to warming. Amounts of nitrogen leached to streams could increase several-fold, increasing stream productivity. Should mountain forests become severely s... Mostrar Tudo |
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Palavras-Chave: |
Biological feedback; Dreno e fonte de carbono e nitrogenio; Ecofisiologia vegetal; Sinks and source of carbon and nitrogen. |
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Thesagro: |
Mudança Climática. |
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Thesaurus Nal: |
climate change. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02731naa a2200301 a 4500
001 1791622
005 2017-04-05
008 1991 bl --- 0-- u #d
100 1 $aPERRY, D. A.
245 $aBiological feebacks to climate change$bterrestrial ecosystems as sinks and sources of carbon and nitrogen.
260 $c1991
520 $aThe major effect of vegetation on carbon fluxes to and from the atmosphere will be reorganization and redistribution of forests due to disturbance and migration. Because they store the bulk of terrestrial carbon, forests will play a key role. Boreal forests could extend onto current tundra, but only if precipitation increases enough to balance increased evapotranspiration. No plants excep weeds are likely to migrate fast enough to keep pace with climate change. Should frequency and severity of fire increase, as is predicted, northern forests are likely to become a source of CO2 to the atmosphere rather than a sink. Some models predict that tropical forests will expand, in which case they would be a strong sink for CO2; other models predict they will contract. However, when land-use practices are taken into account, tropical forests doubtless will contract regardless of wat happens with climate. Hence the tropics are much more lokely to be a CO2 sourcea rather than a sink. In terms of carbon fluxes, changes in terrestrial vegetation are more likely to significantly reinforce the greenhouse effect than to dampen it. The nitrogen released from accelerated decomposition of soil organic matter might stimulate forest productivity somewhat, but several lines of argument suggest that will not provide a significant negative feedback to warming. Amounts of nitrogen leached to streams could increase several-fold, increasing stream productivity. Should mountain forests become severely streassed, the resulting erosion would greatly increase sedimentation os stremas, rivers, and stuaries. Because the global ecosystem is complex, unpredicable, and subject to threshold changes that could be difficult or impossible to reverse, a "wait and see" attitude is not an appropriate response to impending climate change.
650 $aclimate change
650 $aMudança Climática
653 $aBiological feedback
653 $aDreno e fonte de carbono e nitrogenio
653 $aEcofisiologia vegetal
653 $aSinks and source of carbon and nitrogen
700 1 $aBORCHERS, J. G.
700 1 $aTURNER, D. P.
700 1 $aGREGORY, S. V.
700 1 $aPERRY, C. R.
700 1 $aDIXON, R. K.
700 1 $aHART, S. C.
700 1 $aKAUFFMAN, B.
700 1 $aNEILSON, R. P.
700 1 $aSOLLINS, P.
773 $tNorthwest Environmental Journal$gv.7, n.2, p.203-232, 1991.
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Registro original: |
Embrapa Pantanal (CPAP) |
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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
Registro Completo
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
10/04/2000 |
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Data da última atualização: |
10/04/2000 |
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Autoria: |
CHAGAS, C. da S.; CALDERANO FILHO, B.; PEREIRA, N. R.; CARVALHO JUNIOR, W. de; CORREIA, J. R.; REATTO, A.; SPERA, S. T. |
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Título: |
Aptidao agricola das terras do municipio de Ituiutaba-MG utilizando sistema de informacoes geograficas. |
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Ano de publicação: |
1999 |
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Fonte/Imprenta: |
In: CONGRESSO BRASILEIRO DE CIENCIA DO SOLO, 27., 1999, Brasilia, DF. [Ciencia do solo e qualidade de vida: anais]. [Planaltina: Embrapa Cerrados, 1999]. |
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Idioma: |
Português |
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Notas: |
Sessao de posteres 3. Resumo. |
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Palavras-Chave: |
Brasil; Ituiutaba; Minas Gerais. |
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Thesagro: |
Aptidão Agrícola; Cerrado; Sistema de Informação Geográfica. |
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Thesaurus NAL: |
Brazil; geographic information systems; land suitability. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00974nam a2200289 a 4500
001 1555130
005 2000-04-10
008 1999 bl uuuu 0 #d
100 1 $aCHAGAS, C. da S.
245 $aAptidao agricola das terras do municipio de Ituiutaba-MG utilizando sistema de informacoes geograficas.
260 $aIn: CONGRESSO BRASILEIRO DE CIENCIA DO SOLO, 27., 1999, Brasilia, DF. [Ciencia do solo e qualidade de vida: anais]. [Planaltina: Embrapa Cerrados$c1999
500 $aSessao de posteres 3. Resumo.
650 $aBrazil
650 $ageographic information systems
650 $aland suitability
650 $aAptidão Agrícola
650 $aCerrado
650 $aSistema de Informação Geográfica
653 $aBrasil
653 $aItuiutaba
653 $aMinas Gerais
700 1 $aCALDERANO FILHO, B.
700 1 $aPEREIRA, N. R.
700 1 $aCARVALHO JUNIOR, W. de
700 1 $aCORREIA, J. R.
700 1 $aREATTO, A.
700 1 $aSPERA, S. T.
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