|
|
|
Registros recuperados: 26 | |
|
| |
|
|
MIRANDA, R. de Q.; GALVÍNCIO, J. D.; MOURA, M. S. B. de; JONES, C. A.; SRINIVASAN, R.. |
Mudanças na cobertura e uso da terra têm desencadeado mudanças drásticas na cobertura vegetal em várias partes do planeta Terra, causando grandes perdas, modificações e fragmentação de habitats, além da degradação do solo e da água, o que afeta vários microclimas, composição de espécies, interações e estrutura trófica de comunidades. Este estudo tem como objetivo analisar o balanço hídrico da Caatinga na bacia do rio Pontal. A bacia hidrográfica do rio Pontal está localizada em uma região oeste do estado de Pernambuco, e ocupa uma área de 6.057 km2. O SWAT (Soil and Water Assessment Tool) requer dados observados em quatro componentes essenciais: relevo, clima, solos, e uso e cobertura da terra. O projeto foi criado com o auxílio da ferramenta ArcSWAT, e... |
Tipo: Parte de livro |
Palavras-chave: Bacia do Rio Pontal; Índice de área foliar; Mudanças Climática; Climatic; Climatic changes; Caatinga; Clima; Evapotranspiração; Cobertura do Solo; Uso da Terra. |
Ano: 2017 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1083576 |
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
Andrade,Eunice Maia de; Silva,Bernardo Barbosa da; Rodrigues,Meilla Marielle Araújo; Mendonça,Marcos Amauri Bezerra; Chaves,Luiz Carlos Guerreiro. |
Despite uncertainties as to the real causes, there is a large amount of evidence of climatic change on Earth. With the objective of investigating changes in extreme air temperatures, as well as the local effects of these changes, eight data sets, collected throughout the State of Ceará in Brazil, were analyzed. Four series of data were obtained from the semi-arid region, three from the coastal zone, and one from a mountainous region. To quantify the changes that occurred during the study period, variations in maximum and minimum temperatures were calculated in relation to the mean of each data series. The annual rates of temperature increase were estimated from the angular coefficients of the best-fit lines. The results showed that although there are... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Climatic changes; Global warming; Air temperature. |
Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902012000200008 |
| |
|
|
Almeida,Jaime Antonio de; Cararo,Denis Cesar; Uberti,Antônio Ayrton Auzani. |
Dark subsurface horizons, with properties similar to the sombric horizon characterized by the USA Soil Taxonomy, are frequent in Southern Brazil. The genesis of this horizon is controversial and poorly understood. This study aimed to describe the occurrence of sombric-like horizons in Ultisols in the South of Santa Catarina State, at low altitudes, and suggest possible processes of humus transference, accumulation and persistence in these horizons. Physical, chemical and mineralogical properties of four Ultisols were evaluated; three were sampled in a toposequence, and another representative one in an isolated profile (RSP). The dark subsurface horizons coincide with the AB and BA transitional genetic horizons; they are acid, low in base saturation, and... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Dark subsurface horizon; Podzolization; Buried A horizon; Clay-humic substances; Climatic changes. |
Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832009000200018 |
| |
|
|
Ibe, A.C.. |
In the recent past, climatic changes and variations have occurred in Nigeria with resulting adverse socio-economic impact. From these experiences, it is inferred that the expected change in global climate will have far reaching disastrous consequences for Nigeria if appropriate anticipatory technical and policy Measure are not taken. More recent results from various models based on an eventual warming from a doubling of greenhouse gases of between 1.5 and 5oC by the end of the 21st century predict an acceleration of the eustatic rise in sea level from 1.2-1.5mm/yr. over the last hundred year s to 4 – 6mm/yr. although previous estimates were much higher [e.g.56–3.68m by the end of the 21 century] on the low lying Coastal zone of Nigeria, which is rich in... |
Tipo: Report |
Palavras-chave: Coastal zone management; Climatic changes. |
Ano: 1990 |
URL: http://hdl.handle.net/1834/2406 |
| |
|
|
Zonetti,P. da Costa; Suzuki,L. Sayuri; Bonini,E. Aparecida; Ferrarese,M. L. Lucio; Ferrarese-Filho,Osvaldo. |
Glyphosate resistant transgenic soybean [Glycine max (L.) Mettill] expresses a glyphosate insensitive EPSPS (5-enolpyruvylshikimate-3-phosphate synthase). This enzyme is involved in important secondary metabolism pathways, including lignin biosynthesis. Thus, differences in lignin content and growth between susceptible (OC14) and glyphosate-resistant soybean may be observed. The objective of this study was to evaluate differences between growth and lignin content of roots in transgenic and OC14 soybean cultivated at high temperatures. Seeds from the OC14 soybean and its transgenic cultivar, CD213RR, were germinated at 25, 27.5, 30 and 32.5 °C. After 3 d, seedlings were cultivated in Hoagland half-strength nutrient solution during 12 h photoperiods and at... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glyphosate; Abiotic stress; Glycine max; Plants; Climatic changes. |
Ano: 2012 |
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952012000600003 |
| |
|
|
LISBÔA, H.; GRUTZMACHER, A. D.; WREGE, M. S.; GARCIA, F. R. M.; NAVA, D. E.. |
Anastrepha grandis é uma das principais pragas relacionadas à Cucurbitaceae nas Américas do Sul e Central. O presente trabalho teve como objetivo conhecer o impacto do aumento da temperatura no número de gerações de A. grandis, cuja distribuição poderá ser agravada devido ao aumento da temperatura. Essas variações climatológicas foram analisadas para cenários de referência obtidos de 1961?1990 e nos cenários de mudanças climáticas A2 e B1 do Painel Intergovernamental de Mudanças Climáticas, onde encontramos um cenário menos pessimista (B1) e um mais pessimista (A2). Em relação ao período de referência é possível observar que, nas estações mais frias, as regiões Sul e Sudeste mostram-se inadequadas para o desenvolvimento de A. grandis, apresentando no... |
Tipo: Artigo de periódico |
Palavras-chave: Abiotic factors; Climatic changes; Quarantine pest; Fatores abióticos; Cucurbitaceae; Praga Quarentenária; Mudança Climática. |
Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1128472 |
| |
|
| |
|
| |
|
|
Silva,João B. L. da; Ferreira,Paulo A.; Justino,Flávio; Pires,Luanna C.; Toledo,Amanda S.. |
This study aims to evaluate the leaf concentration of nitrogen and phosphorus correlated to the production of photoassimilates in beans plants (Phaseolus vulgaris L.) under high [CO2] and drought stress. The experiment was conducted in Viçosa (Brazil), during the period from April to July 2009, by using open-top chambers equipped with CO2 injection system. The drought stress was applied, through the irrigation suspension, during the period from flowering to maturation. The experimental design was randomized blocks in split-plot scheme with four replication, where the plots with plants grown in [CO2] of 700 mg L-1 and [CO2] environment of 380 mg L-1 and the subplots with plants with and without drought stress. The results were submitted to ANOVA and Tukey... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beans; Mineral nutrition; Photosynthesis; Climatic changes. |
Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000500012 |
| |
|
| |
|
| |
|
|
Barros,Michel J.F.; Silva-Arias,Gustavo A.; Segatto,Ana Lúcia Anversa; Reck-Kortmann,Maikel; Fregonezi,Jeferson N.; Diniz-Filho,José Alexandre F.; Freitas,Loreta B.. |
Abstract Phylogenetic niche conservatism can be investigated at multiple scales on an explicit geographical context. Haplotype-based comparative analyses of lineages occupying the same region, and thus subjected to similar environmental factors, allow decoupling shared evolutionary and ecological patterns, as well as multiple dimensions of adaptive diversification. Here we aimed to assess the role of environmental drivers on diversification of subtropical grassland, based on haplotypic diversity of two plant genera. We sampled two closely related and co-distributed grassland plant genera, Petunia and Calibrachoa, across their entire distribution area. Eigenvectors extracted from pairwise distances based on chloroplast DNA haplotypes were used to fit... |
Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Altitude; Climatic changes; Molecular diversification; Phylogenetic niche conservatism. |
Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400602 |
| |
Registros recuperados: 26 | |
|
|
|