Source-driven remobilizations of nutrients within stem wood in Eucalyptus grandis plantations

Nutrient remobilizations in tree ligneous components have been little studied in tropical forests. A complete randomized block design was installed in Brazilian eucalypt plantations to quantify the remobilizations of phosphorus (P), potassium (K), calcium (Ca), magnesium (Mg), and sodium (Na) within stem wood. Three treatments were studied: control with neither K nor Na addition (C), 3 kmol ha-1 K applied (+K), and 3 kmol ha-1 Na applied (+Na). Biomass and nutrient contents were measured in the stem wood of eight trees destructively sampled at 1, 2, 3 and 4 years after planting in each treatment and annual rings were localized on discs of wood sampled every 3 m in half of the trees. Chemical analyses and wood density measurements were performed individually for each ring per level and per tree sampled. Nutrient remobilizations in annual rings were calculated through mass balance between two successive ages. Our results show that nutrient remobilizations within stem wood were mainly source-driven. Potassium and Na additions largely increased their concentration in the outer rings as well as the amounts remobilized in the first 2 years after the wood formation. The amount of Na remobilized in annual rings was 15 % higher in +Na than in +K the fourth year after planting despite a 34 % higher production of stem wood in +K leading to a much higher nutrient sink. A partial substitution of K by Na in the remobilizations within stem wood might contribute to enhancing Eucalyptus grandis growth in K-depleted soils. © 2013 Springer-Verlag Berlin Heidelberg.

O processo de construção referencial nas crônicas de temas políticos escritas por Carlos Heitor Cony

Pós-graduação em Estudos Linguísticos - IBILCE

Bodas de Sangue, de Carlos Saura: releitura do musical clássico

Pós-graduação em Artes - IA

O vestuário do negro na fotografia e na pintura: Brasil, 1850-1890

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Sistemática molecular de Atta laevigata (Smith 1858) e Acromyrmex balzani (Emery 1890)

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Exposición del Sr. Carlos Martínez Sotomayor, Director Regional del UNICEF para las Américas, en la ceremonia inaugural del Simposio

Inauguración oficial del Director Regional del UNICEF del Simposio en el cual alude al objetivo de éste, que es definir qué es el desarrollo social, cuáles son sus fines y sus relaciones con lo económico y con los regímenes políticos y, sobre todo, cuáles son sus medios para aumetnar el bienestar humano.

Qualidade da água utilizada para consumo em escolas no município de São Carlos-SP

Pós-graduação em Alimentos e Nutrição - FCFAR

As periferias em Antonio Gramsci

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

A recepção das ideias estético-literárias de Lukács em Leandro Konder e Carlos Nelson Coutinho: análise de suas produções teórico-críticas

Pós-graduação em Ciências Sociais - FCLAR

O papel conservador dos liberais: a ANL e os levantes nacional-libertadores e novembro de 1935 nas páginas do jornal O Estado de S. Paulo

Pós-graduação em Ciências Sociais - FFC