Consulta: creatorFacets:"Lima,Walter de Paula"
Registros recuperados: 4
Data/hora: 16/06/2024 16:55:37

Stomatal responses of Eucalyptus species to elevated CO2 concentration and drought stress
Provedor de dados: Scientia Agricola
Autores: Lima,Walter de Paula; Jarvis,Paul; Rhizopoulou,Sophia.
Five species of Eucalyptus (E. grandis, E. urophylla, E. camaldulensis, E. torelliana, and E. phaeotrica), among the ten species most commonly used in large scale plantations, were selected for studies on the effects of elevated CO2 concentration [CO2] and drought stress on stomatal responses of 2.5-month old seedlings. The first three species belong to the subgenus Smphyomyrtus, whereas the fourth species belongs to the subgenus Corymbia and E. phaeotrica is from the subgenus Monocalyptus. Seedlings were grown in four pairs of open-top chambers, arranged to have 2 plants of each species in each chamber, with four replications in each of two CO2 concentrations: 350 ± 30 mumol mol-1 and 700 ± 30 mumol mol-1. After 100 days in the chambers, a series of gas...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus physiology; Water use efficiency; Drought tolerance; CO2 adaptation.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000200005

Can land use changes alter carbon, nitrogen and major ion transport in subtropical brazilian streams?
Provedor de dados: Scientia Agricola
Autores: Silva,Daniela Mariano Lopes da; Ometto,Jean Pierre Henry Balbaud; Lobo,Gré de Araújo; Lima,Walter de Paula; Scaranello,Marcos Augusto; Mazzi,Edmar; Rocha,Humberto Ribeiro da.
Several studies in tropical watersheds have evaluated the impact of urbanization and agricultural practices on water quality. In Brazil, savannas (known regionally as Cerrados) represent 23% of the country's surface, representing an important share to the national primary growth product, especially due to intense agriculture. The purpose of this study is to present a comprehensive evaluation, on a yearly basis, of carbon, nitrogen and major ion fluxes in streams crossing areas under different land use (natural vegetation, sugar cane and eucalyptus) in a savanna region of SE Brazil. Eucalyptus and sugar cane alter the transport of the investigated elements in small watersheds. The highest concentration of all parameters (abiotic parameters, ions, dissolved...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Savanna; Nutrients; Watershed; Sugar cane; Eucalyptus.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000400002

Soil water dynamics and litter production in eucalypt and native vegetation in southeastern Brazil
Provedor de dados: Scientia Agricola
Autores: Silva,Paulo Henrique Muller da; Poggiani,Fabio; Lima,Walter de Paula; Libardi,Paulo Leonel.
High productivity of eucalypt plantations is the result of advances in research that have led to gradual improvements in intensive silvicultural technology. High productivity notwithstanding, eucalypt plantations remain the focus of environmental concerns. Our study aimed to compare the soil water regime, litter fall and nutrients dynamics either in a fragment of native forest or in an adjacent stand of growing eucalypt. We took field measurements during the first three years of eucalypt plantation in a sandy soil in the southeastern region of Brazil. Soil moisture and internal drainage were higher during the early stages of growth of the eucalypt stand, as compared with native vegetation. However, one and a half years after planting, available soil water...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Initial growth; Soil water flow; Soil solution; Nutrient cycling.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000500005

A importância das áreas ripárias para a sustentabilidade hidrológica do uso da terra em microbacias hidrográficas
Provedor de dados: Bragantia
Autores: Attanasio,Cláudia Mira; Gandolfi,Sergius; Zakia,Maria José B.; Veniziani Junior,José Carlos Toledo; Lima,Walter de Paula.
Zonas ripárias são áreas de saturação hídrica, permanente ou temporária, cuja principal função é a proteção dos recursos hídricos de uma microbacia. Essa pesquisa comparou a adequação do uso do solo de dois cenários de planejamento agrícola de uma microbacia: o cenário convencional, representando o método usualmente empregado, que apenas considera as classes de capacidade de uso da terra, e o cenário hidrológico, que inclui a delimitação e avaliação das zonas ripárias. Um estudo de caso foi realizado na Microbacia do Ribeirão São João (3.656 ha), no município de Mineiros do Tietê (São Paulo, Brasil). Mapas de Classe de Capacidade de Uso da Terra e de Adequação do Uso do Solo foram elaborados, utilizando o Sistema de Informação Geográfica (SIG), para a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Classes de capacidade de uso da terra; Adequação do uso do solo; Agricultura sustentável; Cenários; Planos de manejo integrado; Áreas úmidas.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052012000400007