Entity

Time filter

Source Type

Agudos, Brazil

De Moraes C.B.,Sao Paulo State University | Brizolla T.F.,Sao Paulo State University | Teixeira L.G.,Federal University of Tocantins | Zimback L.,If Instituto Florestal Of Sao Paulo | And 4 more authors.
Scientia Forestalis/Forest Sciences | Year: 2014

Eucalyptus grandis is the most commonly cultivated species in commercial stands in Brazil and throughout the world. The species is planted as a cultivar, by seed, e also by clonal plantings of its interspecific hybrids. The study have as objective to analyze the correlations between juvenile and at the end of rotation, aiming to get support for procedures of early selection in forest tree breeding programs. The experiments were set up in two trials in two localities: Angatuba and Lençois Paulista, both in São Paulo State, Brazil. The experimental design was randomized blocks, with 10 replications, six plants per plot, 3 x 2 spacing and 76 progenies. The diameter at breast height, plant height, and wood volume were the studied traits. The evaluations were made through the consecutive years (2, 3, 4, and 5 of age) in Lençois Paulista (Locality 2), and in Angatuba (Locality 1) where annual evaluations from de second to the sixth years of age were done. The results have shown that early selection for wood volume can be done by the 2 years of age, with 0.83 of genetic correlation with the age of final rotation (6 years), and it reaches the value of 0.93, between 3 and 6 years of age, meaning that at half rotation, almost all the selection can be done for the final of rotation. Source


Lira J.M.S.,Federal University of Lavras | Ferreira R.A.,Federal University of Sergipe | Junior C.D.S.,Federal University of Sergipe | Neto E.M.d.S.,Engenheiro Florestal | Santana W.S.,Federal University of Sergipe
Ciencia Florestal | Year: 2013

In order to select species for using in the restoration of riparian forests on the banks of the Sao Francisco River, in the state of Sergipe, an experiment was conducted to evaluate the growth and gas exchange of plants Lonchocarpus sericeus (Poir.) D.C., subject to flooding conditions in the nursery. The experiment was conducted at Forest Nursery, Department of Forest Sciences, Federal University of Sergipe (UFS), the municipality of São Cristóvão, (11 ° 01 'S latitude and 37 ° 12' longitude W, altitude 20 m), state of Sergipe, Brazil, from October 2006 to January 2007 under ambient conditions. We used a completely randomized design (CRD), factorial (2x7), two treatments (control - T0, plants at field capacity and flooded - T1) and days after flooding (0, 15, 30, 45, 60, 75 and 90 days). To simulate the condition of flooding, the plants were placed in plastic pots of black color with a volume of 5 L and more substrate. Following these pots were attached to pots with a volume of 10 L, which was added water until it reaches a water depth of 5 cm above the top of the plants. The control plants kept in pots with a volume of 5 L substrate maintained at field capacity. In non-destructive variables were used four replicates per treatment evaluated every fifteen days, where each replicate consists of six plants, totaling 24. Destructive variables used were 4 replicates per treatment, determined biweekly from 15 days after flooding, where each replicate consists of a plant totaling 24 plants. Therefore, 48 plants were used per treatment. The non-destructive variables were height, diameter and number of leaves. While the destructive variables analyzed were dry weight of roots, dry weight of shoots and dry weight of root / shoot ratio. In addition, we carried out analysis of gas exchange on a monthly basis and evaluated twelve plants per treatment, with two sampling leaves, fully expanded, per plant. The biometric variables were subjected to analysis of variance and subsequently the average test (Tukey p <0.05), while the values of gas exchange were taken from the standard deviations of the mean. Thus, we observe that the flooding caused a reduction in height and dry mass of root / shoot ratio, from 30 days after treatment application. In addition, flooded plants showed morphological changes such as hypertrophy of adventitious roots and lenticels, characteristics of species tolerant to flooding. The net photosynthetic rate has been reduced by 48.20% compared to control after 60 days. However, despite reductions in growth variables and gas exchange species Lonchocarpus sericeus showed promise in the recovery of riparian vegetation, due to its morphological characteristics of species tolerant to flooding. Source


Vatraz S.,Federal Rural University of Amazonia | De Carvalho J.O.P.,Engenheiro Florestal | Gomes J.M.,Federal Rural University of Amazonia | Taffarel M.,Federal Rural University of Amazonia | Ferreira J.E.R.,CKBV Florestal Ltda.
Scientia Forestalis/Forest Sciences | Year: 2012

The effects of reduced impact logging and silvicultural treatments on the growth rate of Laetia procera (Poepp.) Eichler (pau-jacaré) were evaluated on trees with DBH > 35 cm, in 700 ha of terra firme natural forest in the municipality of Paragominas, PA. Seven treatments were established, in six of which liana cutting and competing tree girdling were applied, and one of them was considered as a control. Annual diameter increment of the species was calculated from 2005 to 2009, considering also crown shape of trees, intensity of light on the crowns and presence or effect of liana on trees. Silvicultural treatments did not promote significant differences on the growth rate after five years (2005-2009) of logging and after four years of liana cutting and tree girdling. Source


de Oliveira Freire A.L.,Federal University of Campina Grande | de Sousa Filho G.M.,Engenheiro Florestal | de Miranda J.R.P.,Federal University of Campina Grande | Souto P.C.,Federal University of Campina Grande | de Araujo L.V.C.,Federal University of Campina Grande
Ciencia Florestal | Year: 2010

The objective of this study was to verify the effects of soil salinity on growth and nutrient and sodium accumulation in neem (Azadirachta indica) and cinnamomum (Melia azedarach). The experimental delineation was completely randomized in a 2 × 4 factorial arrangement, with two species (neem and cinnamomum), four salinity levels (electrical conductivity 0.49 (non saline soil), 4.15, 6.33 and 10.45 dS m -1) and four replications. Initially, plants were grown in tubes, and 60 days after emergence, they were transferred to pots containing 3 kg of substrate [soil + manure (2:1)], according to the saline treatment. After 45 days, plant height, dry matter (leaves, stem, shoot (stem + leaves), roots and total) and N, P, K, Ca, Mg, S and Na + shoot accumulation were evaluated. Salinity reduced the plant height in both species, but the effect was more pronounced in neem. Increases in soil salinity caused an increase in the accumulation of Na + and reduced the accumulation of nutrients in shoots of both species, especially in neem. The cinnamomum was more tolerant to salinity levels of soils than neem. Source


Paula R.R.,University of Sao Paulo | Pereira M.G.,Federal Rural University of Rio de Janeiro | Santiago R.R.,Engenheiro Florestal | Amorim H.B.,Federal Rural University of Rio de Janeiro
Floresta e Ambiente | Year: 2012

The purpose of this study was to evaluate the influence of soil properties in the development of eucalyptus plantation. Four-year old stands of Eucalyptus urophylla S. T. BLAKE were evaluated in 'Mario Xavier' National Forest (FLONA) in topographic sequence: two Ultisol areas located in the shoulder (Upper Third) and back slope (Medium Third), and a Planossol area located in the foot slope (Lower Third). For each soil area, a study portion was established and the silvicultural aspects of the stands were evaluated; soil samples were also collected for fertility and bulk density assessment. No significant differences were observed in the chemical properties of the soil, but there were significant differences in bulk density, though, especially in the back slope (MT). Although trees presented longer survival in the foot slope (LT), it was observed that the diameter distribution was more symmetric, with trees of larger diameter and greater basal area per hectare in the shoulder (UT) and back slope (MT). Results obtained suggest the need for differential management of eucalyptus stands due to marked relief differences, once they can influence the age of harvest and final use of wood. Source

Discover hidden collaborations