Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Effects of microsite variation on growth and adaptive traits in a beech provenance trial. | JOURNAL OF FOREST SCIENCE 57 2011 5 192-199 Effects of microsite variation on growth and adaptive traits in a beech provenance trial D. Gõmõry L. Paule E. Gômỏryovả Faculty of Forestry Technical University in Zvolen Zvolen Slovakia ABSTRACT The effects of the within-trial spatial variation of environmental factors on phenotypic traits were studied in the Slovak plot of the international beech provenance trial coordinated by BFH Grosshansdorf with 32 provenances established under a randomized complete block design with three adjacent blocks. Five indicators of soil properties soil moisture bulk density and pH and microclimate average daily temperature and temperature amplitude were assessed at 96 points distributed over a 10 X 10 m grid and their values for the positions of individual trees were estimated by ordinary point kriging. The evaluation of phenotypic variation height diameter Julian days of spring flushing and autumn leaf discoloration vegetation period length late frost damage using a common two-way analysis of variance showed a significant provenance X block interaction effect indicating the heterogeneity of blocks. Analysis of covariance using single-tree kriging estimates of environmental variables as covariates showed that in addition to provenance all phenotypic traits were significantly affected by microsite especially by temperature fluctuation. Employing methods incorporating the spatial component in the evaluation of tree breeding field experiments is advocated. Keywords experimental design Fagus sylvatica geostatistics microsite variation provenance research spatial variation In genetic and breeding research on forest trees homogeneous sites are scarcely available for field trials. Provenance experiments and progeny or clonal tests are usually established on forest land with variable soil conditions frequently surrounded or bordered by older stands affecting the microclimate of the trial by modifying radiation and air currents. Even in case that
