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Content available Dynamika wzrostu wybranych traw w rejonie gorskim
The investigations were conducted in 1994-1995 in the mountain area situated 650 m a.s.l. Dynamic of growth and development of two grasses Arrhenatherum elatius and Dactylis glomerata was compared with the indigenous wild growing Holcus mollis. Every year the experiments lasted for 8 weeks, which included the period of growth from the beginning of grass vegetation till their cutting maturity. The date of the vegetation start was determined in the studies and the height of plants was assessed every two weeks, and dry mass yields and daily increase of those yields were determined. Arrhenatherum elatius was the species, which started its vegetation at the earliest date and was characterised with the greatest growth dynamic while Holcus mollis was placed the last. The biggest growths of dry mass were detected at the shooting stage. It was on an average twice bigger than in the tillering and earing stages and even between 3 and 5 times bigger than in the period after earing. At the shooting stage daily increase in Arrhenatherum elatius yields were on an average twice bigger than for Dactylis glomerata and Holcus mollis.
The rapid increase in the concentration of atmospheric carbon dioxide may exert a substantial impact on the biosphere. The paper presents the effects of elevated CO₂ concentration on the growth of tree species on the base of literature data. Both physiological responses as weil as changes in growth and development of plants are discussed. Furthermore, water and nutrient requirements of trees grown under high CO₂ are considered. Practical aspects of the problem are also included.
Paper presents a review of the recent literature dealing with the UV-B radiation, its effect on physiological processes of plant growth and development, cellular changes, concentration of chemical compounds and changes in morphological plant traits. The reasons of increasing UV-B radiation level are rapidly developing civilization and decreasing of ozone layer. It was stated that the plant reaction to UV-B irradiation depends on plant species and environment conditions. Destructive effects of UV-B radiation to plants may be - to some extent-neutralized by defence mechanisms, a form of specific plant adaptation to stress, however, under conditions of strong UV-B irradiation such mechanisms are not sufficient.
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