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Degradation and restoration processes in crowns and fine roots of polluted montane Norway spruce ecosystems
1995
Cudlin, P. | Chmelikova, E. (Academy of Sciences, Ceske Budejovice (Czech Republic))
The influence of UV-B irradiation on the mitotic activity in Picea abies (L.) Karst.
1995
Bavcon, J. | Gogala, N. (Ljubljana Univ., (Slovenia). Biotechnical Fac., Biology Dept.)
Because of thinning of the ozone layer, there is a continual increase of ultraviolet B (UV-B) irradiation reaching the Earth. We have followed for two and a half years the influence of an artificial source of UV-B irradiation of 17685 J/m** 2 and 28010 J/m** 2 on spruce Picea abies (L.) Karst seedlings. The controls were irradiated with only normal, 6025 J/m** 2. Results show that 3 years seedlings are sensitive to irradiation, as may be first seen from their decreased mitotic activity and in lesser needle and seedling growth in their third year.
Show more [+] Less [-]The classification of chromosomal defects of spruce trees as an alternative in environmental studies
1995
Muller, M. | Grill, D. (Graz Univ. (Austria). Plant Physiology Inst.)
A plant test system by the classification of chromosome aberration in the root tip meristems of young spruce plants (Picea abies (L.) Karst.) has been used to study the environmental influence on the genetic material of trees at natural sites and under defined conditions of greenhouses and open-top chambers. All our results suggest that this plant test system is a valuable tool in environmental monitoring.
Show more [+] Less [-]Comparison of the annual cycle of sulphur content in spruce needles from heavily polluted and less polluted areas
1995
Simoncic, P. | Kalan, P. (Forestry Inst. of Slovenia, Ljubljana (Slovenia))
Needles of 20 years old spruces from Prednji vrh, in the area affected by the Sostanj power station, and from Pokljuka (Alps region, with a relatively unpolluted environment), were analysed for total sulphur content (St). Measurements were taken in a period between April and August twice monthly and in the period from August to April every four weeks (May 1993 - June 1994). Sulphur content in one and two years old spruce needles from Prednji vrh were much higher (one year old needles 2.06-2.50 mg/g needle dry weight, 1993) than in needle samples from Pokljuka (one year old needles 1.05-1.25 mg/g needle dry weight, 1993).
Show more [+] Less [-]The influence of altitude and exposition on the level of cytogenetic damage to Norway spruce in Slovenia
1995
Rogina, D. | Druskovic, B. (Biology Inst., Ljubljana (Slovenia))
Annual research has proven that the level of the so called natural cytogenetic damage to Norway spruce in Slovenia has been correctly estimated at 8. The results of cytogenetic bioindication calculated in accordance with this level show that average cytogenetic damage in the period from 1985 to 1992 enable us to determine environmental influences on the expression of cytogenetic damage.
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