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Spulak O.,Vyzkumny ustav lesniho hospoddrstvi a myslivosti | Vitamvas J.,Ceskd zemedelskd univerzita v Praze | Kacalek D.,Vyzkumny ustav lesniho hospoddrstvi a myslivosti | Kunes I.,Ceskd zemedelskd univerzita v Praze
Zpravy Lesnickeho Vyzkumu | Year: 2011

Liming is considered a measure to support vigor of tree species in the air-polluted areas. T e objective of our study is to f nd out if spot liming at the time of planting can inf uence photosynthesis and leaf chemistry 17 years af er application. An experiment with artif cially planted European beech was established in 1993. Samples of beech leaves were collected three times in May, June and July 2009. Analyzes used were as follows: 1) Chlorophyll a f uorescence using Imaging PAM, 2) contents of chlorophyll and carotenoids being extracted from assimilatory tissues using a spectrophotometer and 3) contents of nutrients (N, P, K, Ca, Mg, S and Si) in leaves. Data were processed using T-test or one-way ANOVA followed by Tukey test. Spot-limed treatment shows dif erence only in mature leaves being collected in July. T ere was a signif cantly higher maximum quantum yield (F /F = 0.867) in limed leaves compared to control treatment (F /F = 0.860). Contents of chlorophylls (Chla+b 2,369 μg.g-1) and carotenoids (Carx+c 590 μg.g1) were also signif cantly higher in raw matter of the limed beeches compared to control treatment (Chla+b 2,268 μg.g1; Car 552 μg.g1). Among the elements analyzed in the leaves, the only dif erence was found in content of phosphorus between the limed (0.15%) and control (0.13%) treatments.

Dusek D.,Vyzkumny ustav lesniho hospoddrstvi a myslivosti | Novak J.,Vyzkumny ustav lesniho hospoddrstvi a myslivosti | Slodicak M.,Vyzkumny ustav lesniho hospoddrstvi a myslivosti
Zpravy Lesnickeho Vyzkumu | Year: 2011

The effects of thinning on the growth and yield of Scots pine (Pinus sylvestris L.) were investigated at two long-time experiments in southern Moravia (Czech Republic). Th e experimental sites are situated at an altitude of 207 m (Straznice I) and 190 m (Straznice III) a. s. l., a subsoil material is sand, soil type is classifi ed as haplic arenic podzol, ecosite was determined as nutrient-poor Pine - Oak (Pineto - Quercetum oligotrophicum arenosum). Th e experiments were established in 1962 at the age of 33 (Straznice I) and 38 (Straznice III) years. Each experiment included three plots with treatments: control, thinning from above and thinning from below. Diameters and heights of trees were measured in fi ve-year periods. Th e latest measurement was done in 2008. In thinned plots, natural mortality was considerably lower compared with unthinned plots. Th e diameter of mean stem clearly increased in thinned plots. However, diameter of dominant trees (100 thickest trees per hectare) was not aff ected by thinning. Th e development of slenderness quotient was similar in all treatments. We found no clear relationship between treatments and basal area, stand volume or total volume production. Th e unclear eff ect of thinning was probably related to late age in which the thinning started.

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