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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. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
21/08/2006 |
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Data da última atualização: |
28/04/2022 |
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Autoria: |
PHILLIPS, O. L.; BAKER, T. R.; ARROYO, L.; HIGUCHI, N.; KILLEEN, T. J.; LAURENCE, W. F.; LEWIS, S. L.; LLOYD, J.; MALHI, Y.; MONTEAGUDO, A.; NEILL, D. A.; VARGAS, P. N.; SILVA, J. N. M.; TERBORGH, J.; MARTÍNEZ, R. V.; ALEXIADES, M.; ALMEIDA, S.; BROWN, S.; CHAVES, J.; COMISKEY, J. A.; CZIMCZIK, C. I.; DI FIORE, A.; ERWIN, T.; KUEBLER, C.; LAURANCE, S. G.; NASCIMENTO, H. E. M.; OLIVIER, J.; PALACIOS, W.; PATIÑO, S.; PITMAN, N. C. A.; QUESADA, C. A.; SALDIAS, M.; LEZAMA, A. T.; VINCETI, B. |
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Afiliação: |
JOSÉ NATALINO MACEDO SILVA, CPATU. |
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Título: |
Pattern and process in Amazon tree turnover, 1976-2001. |
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Ano de publicação: |
2004 |
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Fonte/Imprenta: |
Philippine Transactions of Royal Society of London. B, v. 359, n. 1443, p. 381-407, 2004. |
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Idioma: |
Inglês |
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Conteúdo: |
Previous work has shown that tree turnover, tree biomass and large liana densities have increased in mature tropical forest plots in the late twentieth century. These results point to a concerted shift in forest ecological processes that may already be having significant impacts on terrestrial carbon stocks, fluxes and biodiversity. However, the findings have proved controversial, partly because a rather limited number of permanent plots have been monitored for rather short periods. The aim of this paper is to characterize regional-scale patterns of 'tree turnover' (the rate with which trees die and recruit into a population) by using improved datasets now available for Amazonia that span the past 25 years. Specifically, we assess whether concerted changes in turnover are occurring, and if so whether they are general throughout the Amazon or restricted to one region or environmental zone. In addition, we ask whether they are driven by changes in recruitment, mortality or both. We find that: (i) trees 10 cm or more in diameter recruit and die twice as fast on the richer soils of southern and western Amazonia than on the poorer soils of eastern and central Amazonia; (ii) turnover rates have increased throughout Amazonia over the past two decades; (iii) mortality and recruitment rates have both increased significantly in every region and environmental zone, with the exception of mortality in eastern Amazonia; (iv) recruitment rates have consistently exceeded mortality rates; (v) absolute increases in recruitment and mortality rates are greatest in western Amazonian sites; and (vi) mortality appears to be lagging recruitment at regional scales. These spatial patterns and temporal trends are not caused by obvious artefacts in the data or the analyses. The trends cannot be directly driven by a mortality driver (such as increased drought or fragmentation-related death) because the biomass in these forests has simultaneously increased. Our findings therefore indicate that long-acting and widespread environmental changes are stimulating the growth and productivity of Amazon forests. MenosPrevious work has shown that tree turnover, tree biomass and large liana densities have increased in mature tropical forest plots in the late twentieth century. These results point to a concerted shift in forest ecological processes that may already be having significant impacts on terrestrial carbon stocks, fluxes and biodiversity. However, the findings have proved controversial, partly because a rather limited number of permanent plots have been monitored for rather short periods. The aim of this paper is to characterize regional-scale patterns of 'tree turnover' (the rate with which trees die and recruit into a population) by using improved datasets now available for Amazonia that span the past 25 years. Specifically, we assess whether concerted changes in turnover are occurring, and if so whether they are general throughout the Amazon or restricted to one region or environmental zone. In addition, we ask whether they are driven by changes in recruitment, mortality or both. We find that: (i) trees 10 cm or more in diameter recruit and die twice as fast on the richer soils of southern and western Amazonia than on the poorer soils of eastern and central Amazonia; (ii) turnover rates have increased throughout Amazonia over the past two decades; (iii) mortality and recruitment rates have both increased significantly in every region and environmental zone, with the exception of mortality in eastern Amazonia; (iv) recruitment rates have consistently exceeded mortality rates; (v... Mostrar Tudo |
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Palavras-Chave: |
Brasil. |
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Thesagro: |
Desenvolvimento Florestal; Produção Florestal. |
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Thesaurus Nal: |
Amazonia. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03604naa a2200565 a 4500
001 1408524
005 2022-04-28
008 2004 bl uuuu u00u1 u #d
100 1 $aPHILLIPS, O. L.
245 $aPattern and process in Amazon tree turnover, 1976-2001.$h[electronic resource]
260 $c2004
520 $aPrevious work has shown that tree turnover, tree biomass and large liana densities have increased in mature tropical forest plots in the late twentieth century. These results point to a concerted shift in forest ecological processes that may already be having significant impacts on terrestrial carbon stocks, fluxes and biodiversity. However, the findings have proved controversial, partly because a rather limited number of permanent plots have been monitored for rather short periods. The aim of this paper is to characterize regional-scale patterns of 'tree turnover' (the rate with which trees die and recruit into a population) by using improved datasets now available for Amazonia that span the past 25 years. Specifically, we assess whether concerted changes in turnover are occurring, and if so whether they are general throughout the Amazon or restricted to one region or environmental zone. In addition, we ask whether they are driven by changes in recruitment, mortality or both. We find that: (i) trees 10 cm or more in diameter recruit and die twice as fast on the richer soils of southern and western Amazonia than on the poorer soils of eastern and central Amazonia; (ii) turnover rates have increased throughout Amazonia over the past two decades; (iii) mortality and recruitment rates have both increased significantly in every region and environmental zone, with the exception of mortality in eastern Amazonia; (iv) recruitment rates have consistently exceeded mortality rates; (v) absolute increases in recruitment and mortality rates are greatest in western Amazonian sites; and (vi) mortality appears to be lagging recruitment at regional scales. These spatial patterns and temporal trends are not caused by obvious artefacts in the data or the analyses. The trends cannot be directly driven by a mortality driver (such as increased drought or fragmentation-related death) because the biomass in these forests has simultaneously increased. Our findings therefore indicate that long-acting and widespread environmental changes are stimulating the growth and productivity of Amazon forests.
650 $aAmazonia
650 $aDesenvolvimento Florestal
650 $aProdução Florestal
653 $aBrasil
700 1 $aBAKER, T. R.
700 1 $aARROYO, L.
700 1 $aHIGUCHI, N.
700 1 $aKILLEEN, T. J.
700 1 $aLAURENCE, W. F.
700 1 $aLEWIS, S. L.
700 1 $aLLOYD, J.
700 1 $aMALHI, Y.
700 1 $aMONTEAGUDO, A.
700 1 $aNEILL, D. A.
700 1 $aVARGAS, P. N.
700 1 $aSILVA, J. N. M.
700 1 $aTERBORGH, J.
700 1 $aMARTÍNEZ, R. V.
700 1 $aALEXIADES, M.
700 1 $aALMEIDA, S.
700 1 $aBROWN, S.
700 1 $aCHAVES, J.
700 1 $aCOMISKEY, J. A.
700 1 $aCZIMCZIK, C. I.
700 1 $aDI FIORE, A.
700 1 $aERWIN, T.
700 1 $aKUEBLER, C.
700 1 $aLAURANCE, S. G.
700 1 $aNASCIMENTO, H. E. M.
700 1 $aOLIVIER, J.
700 1 $aPALACIOS, W.
700 1 $aPATIÑO, S.
700 1 $aPITMAN, N. C. A.
700 1 $aQUESADA, C. A.
700 1 $aSALDIAS, M.
700 1 $aLEZAMA, A. T.
700 1 $aVINCETI, B.
773 $tPhilippine Transactions of Royal Society of London. B$gv. 359, n. 1443, p. 381-407, 2004.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Registro Completo
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Biblioteca(s): |
Embrapa Gado de Corte. |
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Data corrente: |
30/09/2009 |
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Data da última atualização: |
13/10/2009 |
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Autoria: |
RISSO-PASCOTTO, C.; PAGLIARINI, M. S.; VALLE, C. B. do. |
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Afiliação: |
CLAUDICÉIA RISSO-PASCOTTO, UEM; MARIA SUELY PAGLIARINI, UEM; CACILDA BORGES DO VALLE, CNPGC. |
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Título: |
A new basic chromosome number for the genus Brachiaria (Trin.) Griseb. (Poaceae: Panicoideae: Paniceae). |
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Ano de publicação: |
2006 |
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Fonte/Imprenta: |
Genetic Resources and Crop Evolution, v. 53, n. 1, p. 7-10, Feb. 2006. |
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Idioma: |
Português |
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Conteúdo: |
The genus Brachiaria (Trin.) Griseb. has been characterized as having two basic chromosome numbers to this date: x = 7 and x = 9, with the predominance of the latter. Cytological studies performed on five accessions of Brachiaria dictyoneura (Fig. et De Not.). Stapf revealed a new chromosome number for the genus, x = 6. The origin of x = 6 is still unknown. All accessions examined for this species presented
2n = 24 and typical meiotic abnormalities of polyploids. The use of such accessions in the Brachiaria hybridization breeding program is discussed. |
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Palavras-Chave: |
Braquiária. |
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Thesagro: |
Brachiaria; Gramínea Forrageira; Melhoramento Genético Vegetal; Pastagem; Poliploidia. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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Marc: |
LEADER 01218naa a2200217 a 4500
001 1512802
005 2009-10-13
008 2006 bl --- 0-- u #d
100 1 $aRISSO-PASCOTTO, C.
245 $aA new basic chromosome number for the genus Brachiaria (Trin.) Griseb. (Poaceae$bPanicoideae: Paniceae).
260 $c2006
520 $aThe genus Brachiaria (Trin.) Griseb. has been characterized as having two basic chromosome numbers to this date: x = 7 and x = 9, with the predominance of the latter. Cytological studies performed on five accessions of Brachiaria dictyoneura (Fig. et De Not.). Stapf revealed a new chromosome number for the genus, x = 6. The origin of x = 6 is still unknown. All accessions examined for this species presented 2n = 24 and typical meiotic abnormalities of polyploids. The use of such accessions in the Brachiaria hybridization breeding program is discussed.
650 $aBrachiaria
650 $aGramínea Forrageira
650 $aMelhoramento Genético Vegetal
650 $aPastagem
650 $aPoliploidia
653 $aBraquiária
700 1 $aPAGLIARINI, M. S.
700 1 $aVALLE, C. B. do
773 $tGenetic Resources and Crop Evolution$gv. 53, n. 1, p. 7-10, Feb. 2006.
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