خيارات البحث
النتائج 1 - 5 من 5
Critical levels for ozone effects on vegetation in Europe
1997
Fuhrer, J. | Skarby, L. | Ashmore, M.R. (Swiss Federal Research Station for Agroecology and Agriculture (FAL), Institute of Environmental Protection and Agriculture (IUL) Liebefeld, CH-3003 Bern (Switzerland))
Mapping of exceedances of ozone critical levels for crops and forest trees in the Netherlands: preliminary results
1997
Leeuw, F.A.A.M. de | Zantvoort, E.D.G. van (National Institute of Public Health and the Environment (RIVM), PO Box 1, 3720-BA Bilthoven (Netherlands))
Effects of ozone on vegetation
1997
Bastrup-Birk, A. | Mortensen, L.
Increased cadmium availability to crops on a sewage-sludge amended soil
1997
Tichý, R. | Ný, V. | Kužel, S. | Kolář, L.
Analysis of spatial distribution of sewage-sludge born cadmium on the experimental plot revealed positive correlation of total cadmium and organic matter. Soil pH fluctuated randomly on the field. ‘Bioavailable’ concentrations, as determined by NH₄-acetate extraction, were closely correlated to the total cadmium levels, and only negligible effects of pH and/or organic matter fluctuations were recorded. Desorption model using modified Freundlich isotherm was applied to predict risks of cadmium solubilization at different conditions. Simulations revealed that the organic matter content within the ranges found at the experimental field cannot support a proper immobilization of cadmium at pH-range observed at the field. The phenomenon was explained by ineffective care for the soil in the past.
اظهر المزيد [+] اقل [-]Increased cadmium availability to crops on a sewage-sludge amended soil
1997
Tichy, R. (Institute of Landscape Ecology, Ceske Budejovice (Czech Republic).) | Nydl, V. | Kuzel, S. | Kolar, L.
