خيارات البحث
النتائج 1 - 10 من 18
Deperissement des forets en Suisse: etat de situation, analyse des causes, projections.
1985
Schuetz J.P.
Soil acidification in Swiss forest ecosystems
2002
Braun, S. (Institute for Applied Plant Biology, Schonenbuch, (Switzerland)) | Kurz, D. | Fluckiger, W.
Soil water measurements in Swiss forest plots show a decrease of the ratio between base cations and aluminium within last 4 years. The decrease is significant in at least one soil layer in 12 of 14 plots and is strongest in areas with high acid deposition. In some of the soils the critical ratio of 1 is being reached today. The development is compared with model estimates. In Switzerland, 80% of acid deposition is made up by nitrogen compounds
اظهر المزيد [+] اقل [-]Assessment of ozone air pollution injuries on forest vegetation in the Transalpine region of Lombardy (Italy) and Canton Ticino (Switzerland)
2002
Ballarin-Denti, A. (Universita Cattolica di Brescia, Brescia (Italy). Dip. Matematica e Fisica) | Bussotti, F. | Cozzi, A. | Krauchi, N. | Gerosa, G. | Schaub, M. | Skelly, J. M. | Tagliaferri, A.
Many previous studies evidenced very high levels of air pollution by ozone between the North Italy (Lombardy) and the Southern Switzerland (Canton Ticino). These levels are mostly attributed to the influence of the large urbanized area of Milan and to the urban and industrial settlements in the Po Valley. Recent researches revealed the existence of spread foliar ozone-like symptoms in many native plant species, both in the Swiss and in Italian sector. Experiments carried out in open top chambers in Canton Ticino allowed us to attribute the foliar symptoms to the ambient air pollution levels
اظهر المزيد [+] اقل [-][To much nitrogen, aci and ozone: pollutant immissions are over the critical threshold]. | Trop d'azote, d'acide et d'ozone: les immissions polluantes depassent le seuil critique.
1997
Voltz, R. | Baumgartner, H.
Elaboration of critical load maps in Switzerland
1993
Rihm, B. (Meteotest, Bern (Suisse))
The spatial distribution of different elements in and on the foliage of Norway spruce growing in Switzerland
1989
Landolt, W. | Guecheva, M. | Bucher, J.B. (Swiss Federal Institute of Forestry Research, 8903 Birmensdorf (Switzerland))
Effects of ozone on the yield of spring wheat (Triticum aestivum L., cv. Albis) grown in open-top field chambers
1989
Fuhrer, J. | Egger, A. | Lehnherr, B. | Grandjean, A. | Tschannen, W. (Eidgenossische Forschungsanstalt fur Agrikulturchemie und Umwelthygiene, 3097 Liebefeld-Bern (Switzerland))
Spatial variation in annual nitrogen deposition in a rural region in Switzerland
1998
Eugster, W. | Perego, S. | Wanner, H. | Leuenberger, A. | Liechti, M. | Reinhardt, M. | Geissbuhler, P. | Gempeler, M. | Schenk, J. (University of Bern, Institute of Geography, Hallerstrasse 12, CH-3012 Bern (Switzerland))
Deposition of nitrogen-containing compounds to an extensively managed grassland in central Switzerland
1996
Hesterberg, R. | Blatter, A. | Fahrni, M. | Rosset, M. | Neftel, A. | Eugster, W. | Wanner, H. (Swiss Federal Research Station for Agricultural Chemistry and Environmental Hygiene, CH-3097 Liebefeld-Bern (Switzerland))
Beech foliage as a bioindicator of pollution near a waste incinerator
1994
Keller, T. | Matyssek, R. | Gunthardt-Goerg, M.S. (Swiss Federal Institute for Forest, Snow and Landscape Research, Birmensdorf ZH, CH 8903 (Switzerland))
