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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Dynamika růstu buku lesního (Fagus sylvatica L.) ve smíšeném lese a monokultuře ve Východních Karpatech
 Vyčítalová, Hana
The study observes the difference in the growth dynamics of common beech (Fagus sylvatica L.) in monocultures and in stands with admixture of conifers like Norway spruce (Picea abies L.) and/or Silver fir (Abies alba Mill.) in the Eastern Carpathians. Point dendrometers and soil humidity sensors were used for measurement of tree growth and water availability that took place near the Râșca in the Suceava region. Out of the growing season, hemispherical ("fish-eye") images were also taken to evaluate canopy openness. Mixed models were used for the statistical evaluation of the data. Negative effect of increasing the percentage of conifers in the stand on growth and the maximum growth rate of beech was found insignifficant, which give an evidence of beeches strong competitive ability in habitats with favorable conditions. However, a negative effect of a higher admixture percentage of conifers on the availability of water in the soil was signifficant, probably due to higher interception, which indicates possible problems when growing beech with a high admixture of conifers in drought-prone locations. The growth rate was highest at the turn of June and July, which refers to the dependence of beech growth dynamics on the solar cycle and indicates that drought could have the strongest negative impact on growth in the period around the summer solstice. On the basis of the obtained results, beech silviculture could be recommended with only a small admixture of conifers, and the admixture of other deciduous trees should be preferred in order to reduce the interception of the stand
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Influence of air humidity, air and soil temperature and soil moisture on diameter increment of Pinus spp.
 Bartoš, Radek
Increments of hourly intervals of Pinus oocarpa was measured during the year 2015. The research was based in Villa Rica area, Peru. Each hour change of stem was measured by band dendrometer even climatic values like air temperature, air humidity, soil temperature and soil water availability were measured every hour too. The measured tree is part of agroforestry system of coffee, where shading tree is the main role. Measured climatic values were compared to daily changes and weekly changes of the stem. A statistically significant effect (p<0.001) was found only for the temperature and humidity of the air and their effect on changes in the strain during day and night. The above graphs have a clear effect on other values where statistical significance has not been demonstrated.
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