Consulta: creatorFacets:"Rocha,Humberto Ribeiro da"
Registros recuperados: 4
Data/hora: 09/06/2024 04:11:33

Spatial Distribution of Annual and Monthly Rainfall Erosivity in the Jaguarí River Basin
Provedor de dados: 90
Autores: Pontes,Lucas Machado; Silva,Marx Leandro Naves; Bispo,Diêgo Faustolo Alves; Avalos,Fabio Arnaldo Pomar; Oliveira,Marcelo Silva de; Rocha,Humberto Ribeiro da.
ABSTRACT The Jaguarí River Basin forms the main water supply sources for the São Paulo Metropolitan Region and other cities in the state. Since the kinetic energy of rainfall is the driving force of water erosion, the main cause of land and water degradation, we tested the hypothesis of correlation between the erosive potential of rainfall (erosivity) and geographical coordinates and altitude for the purpose of predicting the spatial and temporal distribution of the rainfall erosivity index (EI30) in the basin. An equation was used to estimate the (EI30) in accordance with the average monthly and total annual rainfall at rainfall stations with data available for the study area. In the regression kriging technique, the deterministic part was modeled using...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Geostatistics; Soil and water conservation; Erosion; EI30.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100529

Isotopic view of vegetation and carbon and nitrogen cycles in a cerrado ecosystem, southeastern Brazil
Provedor de dados: 63
Autores: Coletta,Luciana Della; Nardoto,Gabriela Bielefeld; Latansio-Aidar,Sabrina Ribeiro; Rocha,Humberto Ribeiro da.
Carbon and nitrogen biogeochemical cycles in savannas are strongly regulated by the seasonal distribution of precipitation and pulses of nutrients released during the wetting of the dry soil and are critical to the dynamics of microorganisms and vegetation. The objective of this study was to investigate the spatial and temporal variability of C and N isotope ratios as indicators of the cycling of these elements in a cerrado sensu stricto area, within a protected area in a State Park in the state of São Paulo, Brazil. The foliar δ13C and δ15N values varied from -33.6 to -24.4 ‰ and -2.5 to 4.5 ‰, respectively. The δ13C values showed a consistent relationship with canopy height, revealing the importance of structure of the canopy over the C isotopic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cerrado; Carbon; Nitrogen; Stable isotopes; Woody savanna.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000400006

Can land use changes alter carbon, nitrogen and major ion transport in subtropical brazilian streams?
Provedor de dados: 63
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

Fitossociologia de um Cerrado denso em área de influência de torre de fluxo de carbono, Pé-de-Gigante, Parque Estadual de Vassununga, SP
Provedor de dados: 49
Autores: Latansio-Aidar,Sabrina Ribeiro; Oliveira,Ana Claudia Pereira de; Rocha,Humberto Ribeiro da; Aidar,Marcos Pereira Marinho.
O domínio do Cerrado compreende uma área contínua nos estados centrais do Brasil e áreas disjuntas em outros estados, incluindo São Paulo. Essa vegetação ocupava originalmente 21% do território brasileiro, restando atualmente apenas 21,6% de sua extensão original. A área recoberta por essa vegetação em São Paulo cobria 14% de sua área total e seus remanescentes recobrem menos de 1% da ocorrência original dessa vegetação. Estudos recentes indicam que o valor da produtividade líquida no Cerrado Pé-de-Gigante (SP) constitui um pequeno dreno de carbono e indicou que a sazonalidade foi o fator determinante do valor observado. Os estudos dos fluxos de carbono em ecossistemas terrestres são raramente acompanhados de abordagens ecofisiológicas de modo a explorar a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anadenanthera falcata; Área basal; Cuestas basálticas; Índice de valor de importância; Leguminosae; Santa Rita do Passa Quatro.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032010000100020