Affiner votre recherche
Résultats 11-13 de 13
Effects of big polluters on biodiversity of northern terrestrial ecosystems
2002
Kozlov, M.V. (University of Turku, Turku (Finland). Section of Ecology)
Impacts of big polluters on adjacent ecosystems can be seen as long-term unintentional experiments. Contrary to the common guess, results of these experiments may be used to address basic ecological problems, like diversity - stability and diversity - productivity relationships, as well as evaluate general effects of disturbance on ecosystem structure and functioning. Toxicity of pollutants plays a leading role at early stages of forest decline, while transformation of forests into birch woodlands and industrial barrens is accelerated by positive feedback's acting primarily via changes in microclimate
Afficher plus [+] Moins [-]European oak decline (Quercus robur and Q. petraea) and population genetic structures
2002
Hertel, H. | Zaspel, I. (Institute for Forest Genetics and Forest Tree Breeding, Waldsieversdorf (Germany). Federal Research Centre for Forestry and Forest Products)
Phenotypical differentiation between and within populations was observed. During the last decade, vitality decreased for both species in the observation plots in accordance with the general trend in Germany. Differences between the species were detected for single symptomatic traits like bark necroses. The genetic analyses with isozyme markers as well as cpDNA haplotypes resulted in remarkable differences between species
Afficher plus [+] Moins [-]Neutron activation analyses for air pollution studies: some preliminary results of the European moss-survey 2000
2002
Ermakova, E. | Frontasyeva, M. (Joint Institute for Nuclear Research, Dubna (Russia). Frank Laboratory of Neutron Physics)
Instrumental neutron activation analysis (INAA) at the Joint Institute for Nuclear Research is presently being used in several projects on air pollution studies supported by the International Atomic Energy Agency and the Plenipotentiaries of the country members of JINR. They involve moss and lichen biomonitoring techniques and GIS technology for constructing geographical maps of atmospheric deposition patterns of key heavy metals and a number of additional elements. Multi-element INAA is considered to be a reference analytical technique providing most reliable results for the bulk elemental content due to the non-destructive way of sample preparation for analysis
Afficher plus [+] Moins [-]