Tiago de Oliveira Godinho

Quantification of biomass and nutrients in the accumulated litter in a section of Submontane Seasonal Semideciduous Forest, ES.

Objetivou-se, com o trabalho, quantificar o acumulo de serapilheira, bem como os macronutrientes e o carbono orgânico na Floresta Estacional Semidecidual Submontana, localizada em Cachoeiro de Itapemirim, ES. A amostragem da serapilheira foi realizada em 12 parcelas (20 m x 50 m), sendo as mesmas distribuidas de forma sistematica no campo. Em cada uma das 12 parcelas, foram coletadas mensalmente 12 amostras de serapilheira acumulada, de forma aleatoria, com o auxilio de um gabarito de metal de 0,25 m x 0,25 m. O estudo de acumulo de serapilheira na floresta foi analisado segundo o delineamento inteiramente casualizado, com 12 tratamentos (meses do ano) e 12 repeticoes. O acumulo de serapilheira mostrou-se sazonal, com maiores acumulos, ocorrendo no final da estacao seca e de menores temperaturas do ar (Dez/09, Jan/10, Set/10 e Out/10), contendo em media 5,5 Mg ha-1 de serapilheira acumulada. O Calcio foi encontrado em maior teor e conteudo, sendo o conteudo medio de macronutrientes contidos na serapilheira de 293,59 kg ha-1.

Aboveground stock of biomass and organic carbon in stands of Pinus taeda L.

This study aimed to estimate biomass and organic carbon in stands of Pinus taeda L. at different ages (14, 16, 19, 21, 22, 23 and 32 years) and located in the municipality of General Carneiro (PR). In order to estimate biomass and organic carbon in different tree components (needles, live branches, dead branches, bark and stem wood), the destructive quantification method was used in which seven trees from each age category were randomly sampled across the stand. Stocks of biomass and organic carbon were found to vary between the different age categories, mainly as a result of existing dissimilarities between ages in association with forest management practices such as thinning, pruning and tree density per hectare.

Reflorestamento e Recuperação de Atributos Químicos e Físicos do Solo

The objective with this study was to evaluate the influence of reforestation with native species from seasonal semideciduous forest, eucalyptus plantation, and pasture in the soil chemical and physical properties of degraded areas. Five sites were selected in the watershed of the Aguapei River in the Garca city, Sao Paulo state: two reforestation areas with native species, with four and nine years old; a reforestation area with eucalyptus plantation, a pasture area, and a forest fragment used as control. The forest fragment presented the lowest exangeable bases and the highest levels of P, SOC and CEC; it also showed the lowest penetration resistance, and the largest diameter and aggregate stability. The chemical and physical soil attributes of the reforestation areas differed from those of the forest fragment (control), showing that the recovery period was not sufficient to restore these attributes. However, the 9-year-old reforestation area presented significant improvement of these soil attributes, tending to approach those of the control area.

Reflorestamento e Recuperação de Atributos Químicos e Físicos do Solo / Reforestation and Recovery of Soil Chemical and Physical Attributes

The objective with this study was to evaluate the influence of reforestation with native species from seasonal semideciduous forest, eucalyptus plantation, and pasture in the soil chemical and physical properties of degraded areas. Five sites were selected in the watershed of the Aguapei River in the Garca city, Sao Paulo state: two reforestation areas with native species, with four and nine years old; a reforestation area with eucalyptus plantation, a pasture area, and a forest fragment used as control. The forest fragment presented the lowest exangeable bases and the highest levels of P, SOC and CEC; it also showed the lowest penetration resistance, and the largest diameter and aggregate stability. The chemical and physical soil attributes of the reforestation areas differed from those of the forest fragment (control), showing that the recovery period was not sufficient to restore these attributes. However, the 9-year-old reforestation area presented significant improvement of these soil attributes, tending to approach those of the control area.

PRODUTIVIDADE DO MINIJARDIM E QUALIDADE DE MINIESTACAS DE UM CLONE HÍBRIDO DE Eucalyptus grandis x Eucalyptus urophylla (I-224) EM FUNÇÃO DE DOSES DE NITROGÊNIO

For being part of innumerable compounds and being directly related with the photosynthetic capacity of plants, Nitrogen (N) can significantly influence the production and rooting of cuttings. On the basis of this context, the work aimed to evaluate the effect of increasing doses of N in the productivity, capacity and speed of rooting mini-cuttings produced from mini-stumps of hybrid clones of Eucalyptus grandis x E. urophylla (I-224), beyond the quality of the formed changes. The present work was carried through in nursery seedlings of Eucalyptus, in a mini-garden of sand stream bed of FAEF, in Garca, Sao Paulo state. The used experimental delineation was complete randomized design with 4 replications, being the treatments consisted of 5 different doses of Nitrogen in nutritional solution (0; 80; 160; 240 and 320 mg L-1). The variables analyzed were: number of cuttings produced, the productivity index, rooting of cuttings produced and determination of the dry mass of seedlings. The dose of nitrogen applied in the mini-garden influenced the production of stakes, with a quadratic, reaching maximum production (13,1 stakes strain-1 month-1) with the estimated dose of 129 mg L-1.The percentage of rooting presented increasing linear behavior. The dose that provided the biggest index of productivity of the mini-garden was of 194 mg L-1. The dose of nitrogen applied in the mini-garden influenced the rooting significantly and the dry mass of formed seedlings.