Genetic parameters of Eucalyptus clones for early selection in frost occurrence region [Estimativas de parâmetros genéticos para seleção precoce de clones de Eucalyptus para região com ocorrência de geadas]
De Moraes C.B.,São Paulo State University |
De Freitas T.C.M.,São Paulo State University |
Pieroni G.B.,Empresa Palmasola S.A. |
Zimback L.,If Instituto Florestal Do Estado Of Sao Paulo |
Mori E.S.,São Paulo State University
Scientia Forestalis/Forest Sciences | Year: 2014
Further to increase the wood yield, is important goal of forest tree breeding the adaptation of clones through diverse environment, especially for soil and climate. Perennial tree species such as eucalypts, have a long life cycle and the frosts can occur and to be their limiting source of cultivation. The aim of the study was to determine the genetic variability and the genetic correlations between selection ages of clones cultivated in the municipality of Palma Sola, SC, Brazil, where frosts are common in the winter. A clonal trial was set up in 2008 in Palma Sola, by statistical design of randomized complete blocks considering 29 clones, six replications, six plants per plot, and 3.0m x 3.0 m spacing. The silvicultural characters of total plant height, diameter of breast height (dbh), and wood volume were evaluated through 24, 36, 48, and 60 months old. The deviance analysis and estimates of genetic parameters were based on the REML / BLUP genetic statistical procedure. Significant differences were observed for all traits in the deviance analysis. High correlations and statistically significant between characters were observed, indicating that the early selection will provide significant gains. Part of the clones USP/IPEF 64, USP/IPEF 78, USP/IPEF 52, USP/IPEF 68, and USP/IPEF 74) are potential to be used into the breeding programs and in commercial stands into the studied frost regions.
De Moraes C.B.,Federal University of Tocantins |
Tambarussi E.V.,State University of the Central West |
Gama L.,Federal University of Tocantins |
Abilio F.M.,São Paulo State University |
And 4 more authors.
Scientia Forestalis/Forest Sciences | Year: 2016
This research aimed to study the genetic control of silvicultural traits in Eucalyptus urophylla progenies for frost tolerance. Three open-pollinated progeny tests were installed in a randomized blocks design, 150 progenies, four replications, six plants per plot. The tests were implemented in two contrasting regions for the occurrence of frost. In areas with frost occurrence the tests were implemented in the Eucatex (Itatinga/SP) and Palmasola (Palma Sola/SC) companies; for areas with rare frosts the trial was established in Experimental Station of Anhembi/SP. Plant height; diameter at breast height and wood volume at 12 and 24 months old were measured. The genetic variability in the population was high, the individual genetic variation coefficient ranging from 5.85% (ALT) to 22.58% (VOL) and the heritability in the narrow sense from 0.13 (ALT) to 0.77 (DAP and VOL), indicating a high potential for selection and breeding of the species for frost tolerance.
De Lima I.L.,If Instituto Florestal Do Estado Of Sao Paulo |
Longui E.L.,If Instituto Florestal Do Estado Of Sao Paulo |
Zanon B.,If Instituto Florestal Do Estado Of Sao Paulo |
Florsheim S.M.B.,If Instituto Florestal Do Estado Of Sao Paulo |
And 2 more authors.
Scientia Forestalis/Forest Sciences | Year: 2015
We investigated the effect of diameter class on the wood anatomy and properties of 24-year-old Liquidambar styraciflua to determine the potential wood quality in three different diameter classes: large (33cm), medium (26.5cm), and small (22.4cm). We hypothesize that different diameter classes have wood variations with potential distinct qualities. Results showed the highest values of compression parallel to the grain, shear parallel to the grain and modulus of rupture in the small and medium classes. Radial variation showed an increase in vessel diameter, decrease in the frequency of vessels, and increase in the fiber length toward the bark. In contrast to other studies, longer fibers were found, possibly associated with climatic conditions. Density did not vary among the three classes, but it was more homogeneous in the large and medium classes, but not the small class. Stiffness was more homogeneous in the large and small classes.
Durigan G.,If Instituto Florestal Do Estado Of Sao Paulo |
Suganuma M.S.,If Instituto Florestal Do Estado Of Sao Paulo |
De Melo A.C.G.,If Instituto Florestal Do Estado Of Sao Paulo
Scientia Forestalis/Forest Sciences | Year: 2016
Forest restoration projects have increased in number and extension in Brazil in recent years. Notwithstanding, the difficulty in evaluating if the ecosystem undergoing restoration follows an expected trajectory or is under the expectations; this is an obstacle to be overcome. This study aimed at generating expected values for monitoring community attributes of riparian forests over the ages after planting trees. In this region the semi-deciduous Atlantic Forest was the historical vegetation. The reference values were obtained by modeling the trajectories of 26 riparian forests undergoing restoration at different ages. Among the tree community attributes analyzed, we selected as ecological indicators, those that: 1) followed predictable trajectories through time, and 2) represented the recovery of ecosystem structure, richness and relevant ecosystem services. Expected values for forest restoration projects aging from 4-25 years are presented for the indicators: basal area, aerial biomass, canopy cover (by two different methods), total tree richness (planted + regenerating), density and richness of tree species spontaneously regenerating in two size classes. The result is a robust tool to verify if a riparian forest undergoing restoration follows the expected trajectory or is below the expectations for the time elapsed since the intervention, requiring adaptive management. This tool can be improved, provided that addtional data are obtained for the semi-deciduous forest region. Additionally, the procedure adopted here to generate the reference values can be replicated to other vegetation types, as far as monitoring data are provided.