Evaluation and Integration of Environmental Stress Using Stable Isotopes

Griffiths, Howard

doi:10.1007/0-306-48135-9_19

Cited by 2 publications

(2 citation statements)

References 83 publications

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“…The two main discriminating steps against 13 C in autotrophic tissue are CO 2 diffusion into the leaf air spaces (stomatal resistance) and carboxylation of ribulose-1,5-bisphosphate. Instantaneous ( 13 CD i , based on on-line gas exchange) or net long-term discrimination against 13 C ( 13 CD n , in organic material) is usually positively correlated with the intracellular to ambient CO 2 concentration ratio (C i :C a ) and is indicative of differences in water-and nitrogen-use (Farquhar et al, 1982;Griffiths, 1996;Fownes and Harrington, 2004). Therefore, relationships among photosynthesis, biomass increment and long-term leaf 13 CD n may provide a basis for the development of physiological indices for the selection of species or provenances under conditions where growth is limited by light, water or nitrogen availability (Griffiths, 1996;Fownes and Harrington, 2004).…”

Section: Introductionmentioning

confidence: 99%

Potential use of leaf carbon isotope discrimination for the selection of shade-tolerant species

Kennedy

Dhubháin

Ferguson

et al. 2006

Forest Ecology and Management

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Section: Introductionmentioning

confidence: 99%

Potential use of leaf carbon isotope discrimination for the selection of shade-tolerant species

Kennedy

Dhubháin

Ferguson

et al. 2006

Forest Ecology and Management

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“…Ela está associada ao tipo de metabolismo adotado pela planta, C3, C4 ou CAM, descritos anteriormente, já que estes estão diretamente ligados a evapotranspiração (Griffiths, 2004).…”

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Variações paleoambientais e paleoclimáticas durante o holoceno no Rio Grande do Norte a partir do estudo de registros geoquímicos de sedimentos de lagos e cavernas

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Geociências da Universidade de São Paulo e a CAPES pelas bolsas de doutorado no país e de doutorado sanduíche.Aos meus pais, pelo amor, incentivo е apoio incondicional.A toda minha família pelo apoio, carinho e compreensão da minha ausência.Ao Cristiano Roberto B. da Silva pelo apoio, carinho, companhia e incentivo. Figura 10 -Distribuição média recente das chuvas no Brasil durante os meses de dezembro, janeiro e fevereiro (DJF), março, abril e maio (MAM), junho, julho e agosto (JJA), e setembro, outubro e novembro (SON Figura 23 -Cromatograma obtido em GCMS com (A) identificação dos hopanos e moléculas da fração ácidos n-alcanos e (B) identificação das moléculas de ácidos n-alcanóicos, ambos do ABSTRACT Paleoenvironmental and paleoclimatic variations during the Holocene at Rio Grande doNorte inferred from studies about sediment geochemistry of lakes and cavesThe northern sector of Nordeste of Brazil (NEB) is one of the most interesting regions to study mechanisms and processes related to fluctuations tropical rainfall, as the majority of annual precipitation is associated to the meridional migration of Intertropical Convergence Zone (ITCZ). Climate in NEB changed during the Holocene, although paleoclimatic interpretations are still controversial due to small number of studies. This study contribute to the discussion about paleoclimatic and paleoenvironmental changes of NEB by using geochemistry, micropaleontological, biogeochemistry and deuterium and carbon isotope analyses in lacustrine sediments and bat guano, and also speleothem isotope records from middle to late Holocene.Studies from Boqueirão Lake suggested that its formation occurred due to the fluvio-eolian dynamic, which resulted in blockage of fluvial channels during the holocenic humid period. Transition between fluvial and lacustrine system recorded the barrage formation and was defined around 4,500 years BP and suggested by the substitution of fluvial sponge spicules to lacustrine diatoms, mainly Mastogloia smithii var. lacustres, preserved in sediments. These data demonstrated that depth fluctuations of Boqueirão Lake were not associated to local precipitation accumulation.Paleoclimatic changes were reconstructed from Boqueirão Lake and Trapiá Cave based on δD of n-alkanoic acids of 28 carbons, which are produced by terrestrial (Wang et al., 2004;Cruz et al., 2005Cruz et al., , 2006; Van-Breukelen et al., 2008;Bird et al., 2011; Stríkis et al., 2011;Kanner et al., 2012;Novello et al., 2012; Mosbleach et al., 2012; , 2005, 2006) e no oeste da bacia amazônica e nos altiplanos andinos Mosbleah et al., 2012;.O aumento da insolação de verão austral é acompanhado pela redução da insolação de verão boreal. Esse padrão antifásico do balanço radiativo estabelecido nas relações inter-hemisférica é observado na comparação entre os registros de espeleotemas associados à atividade do SMAS com os registros da sudeste da China, associadas às monções asiáticas (Wang et al., 2001(Wang et al., , 2004(Wang et al., , 2006 Novello et al., 2012). A maior pa...

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Evaluation and Integration of Environmental Stress Using Stable Isotopes

Cited by 2 publications

References 83 publications

Potential use of leaf carbon isotope discrimination for the selection of shade-tolerant species

Potential use of leaf carbon isotope discrimination for the selection of shade-tolerant species

Variações paleoambientais e paleoclimáticas durante o holoceno no Rio Grande do Norte a partir do estudo de registros geoquímicos de sedimentos de lagos e cavernas

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