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Registros recuperados: 4
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Mercury distribution in Douro estuary (Portugal) IPB - Escola Superior Agrária
Ramalhosa, Elsa; Pereira, Eduarda; Vale, C.; Válega, M.; Monterroso, Paulo; Duarte, A.C..
Determinations ofdissolved reactive and total dissolved mercury, particulate and sedimentary mercury, dissolved organic carbon (DOC), particulate organic carbon (POC) and suspended particulate matter (SPM) have been made in the estuary ofriver Douro, in northern Portugal. The estuary was stratified by salinity along most ofits length, it had low concentrations of SPM, typically <20 mg dm-3, and concentrations of DOC in the range <1.0–1.8 mg dm-3. The surface waters had a maximum dissolved concentration of reactive mercury of about 10 ng dm-3, whereas for the more saline bottom waters it was about 65 ng dm-3. The surface waters had maximum concentrations oftotal suspended particulate mercury of ~7 ug g-1 and the bottom waters were always < l ug...
Tipo: Article Palavras-chave: Mercury; Estuaries; Partitioning; Dissolved Organic Carbon; SPM.
Ano: 2005 URL: http://hdl.handle.net/10198/3372
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Mercury sources and transformations in a man-perturbed tidal estuary; the Sinnamary Estuary, French Guiana ArchiMer
Muresan, B; Cossa, Daniel; Coquery, M; Richard, S.
The distribution, partition and speciation of mercury (Hg) were studied along the redox gradient of an anthropogenically perturbed tropical estuary, the Sinnamary Estuary in French Guiana. This system is a partially mixed estuary characterized by an anoxic freshwater end-member, while the marine end member consists of the Amazon Plume. The set up of an artificial oxygenation system in the anoxic freshwater end-member generates sharp gradients of major chemical species (iron, sulfides, etc.) coupled with intense organic matter (OM) turnover. The coexistence of oxygenated waters and dissolved sulfides in an organic rich environment depicts the Upper Sinnamary Estuary (USE: part of Sinnamary Estuary under the tidal influence but upstream of the salt...
Tipo: Text Palavras-chave: Partitioning; Speciation; Redox; Mercury; Reservoir; Estuary.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4223.pdf
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Resposta de especies florestais a baixa disponibilidade de oxigenio. II. Alteracoes na producao e distribuicao de materia seca. Repositório Alice
PELACANI, C.R.; OLIVEIRA, L.E.M. de; CRUZ, J.L..
O objetivo deste trabalho foi o de avaliar a producao e distribuicao de materia seca e o desenvolvimento de estruturas morfologicas de especies florestais exoticas e nativas em condicoes de baixa disponibilidade de oxigenio no meio de cultivo, e identificar as que apresentam melhor adaptacao a essas condicoes. Utilizaram-se plantas jovens das especies sesbania (Sesbania sesban), ameixa (Eriobotrya japonica), seringueira (Hevea brasiliensis) e jacaranda-mineiro (Macchaerium villosum). O estudo foi realizado em casa de vegetacao, e os tratamentos foram constituidos de dois niveis de disponibilidade de oxigenio no meio de cultivo em quatro repeticoes. O substrato utilizado foi areia grossa lavada, irrigada com solucao nutritiva. Apesar do efeito negativo...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Anoxia; Producao de materia seca; Particao; Flooding; Dry matter yield; Partitioning.
Ano: 1998 URL: http://www.alice.cnptia.embrapa.br/handle/doc/97644
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Yield and performance of sugarcane in on-farm interface with rubber in Brazil. Repositório Alice
PINTO, L.F.G.; BERNARDES, M.S.; PEREIRA, A.R..
Agroforestry systems are indicated as an alternative for sugarcane (Saccharum officinarum) cultivation in Piracicaba, SP, Brazil, however there are not many field experiments on plant performance under these conditions in the world. The objective of this work was to assess crop yield and partitioning in a sugarcane-rubber (Hevea brasiliensis) interface in on-farm conditions. The availability of irradiance for the crop along the interface was simulated and its effect over sugarcane dry matter production was tested. Crop yield was negatively affected by distance of the trees, but development and sucrose were not affected. Above ground dry matter increased from 16.6 to 51.5 t ha-1 from trees. Partitioning did not have a defined standard, as harvest index...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Saccharum officinarum; Hevea brasiliensis; Agroforestry systems; Light; Partitioning; Sistemas agroflorestais; Luz; Partição.
Ano: 2006 URL: http://www.alice.cnptia.embrapa.br/handle/doc/118444
Registros recuperados: 4
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