خيارات البحث
النتائج 1 - 10 من 26
Pesticides in rainfall and air in Italy.
1993
Trevisan M. | Montepiani C. | Ragozza L. | Bartoletti C. | Ioannilli E. | Re A.A.M. del
Observations on long-term air-soil exchange of organic contaminants.
1994
Jones K.C.
Evidence for long-term changes in the soil composition of selected organic compounds, brought about by exchanges with the atmosphere, is briefly reviewed. In the case of some compounds - such as benzo(a)pyrene and octachlorodibenzo-p-dioxin, soils may be significant long-term environmental sinks for atmospherically-derived material. In other cases - such as phenanthrene and some of the lighter PCBs, de-gassing or volatilisation from soil back to the air can occur under certain conditions. Hence the soil may act as a "short-term" sink, and a potential source to atmosphere. Indeed, for some 'semi-volatile' compounds used in large quantities in the past - such as PCBs, soil outgassing may actually be an extremely important source to contemporary air. Furthermore, soil outgassing from areas of former high use may provide an important driving mechanism for continued "global cycling" of a range of semi-volatile organochlorine compounds.
اظهر المزيد [+] اقل [-][Pollens: geographical distribution and temporal evolution (France)] | Les pollens: distribution geographique et evolution temporelle (France)
2000
Thibaudon, M. (Reseau National de Surveillance Aerobiologique, Saint Clement les Places (France))
[Surveillance of pollens: the National network of aerobiological surveillance (RNSA; France)] | Surveillance des pollens: le Reseau national de surveillance aerobiologique (RNSA)
2000
Thibaudois, M. (Reseau National de Surveillance Aerobiologique, Saint Clement les Places (France))
The global nitrogen cycle: changes and consequences
1998
Galloway, J.N. (Department of Environmental Sciences, University of Virginia, Charlottesville, VA 22903 (USA))
EMEP eulerian model for atmospheric transport and deposition of nitrogen species over Europe
1998
Jonson, J.E. | Bartnicki, J. | Olendrzynski, K. | Jakobsen, H.A. | Berge, E. (Meteorological Synthesizing Centre - West of EMEP, The Norwegian Meteorological Institute, P.O. Box 43, Blindern N-0313 Oslo (Norway))
Growth, respiration and nitrogen content in needles of Scots pine exposed to elevated ozone and carbon dioxide in the field
1998
Kellomaki, S. | Wang KaiYun (Faculty of Forestry, University of Joensuu, PO Box 111, FIN-80101 Joensuu (Finland))
The mass budget of atmospheric ammonia in woodland within 1 km of livestock buildings
1998
Fowler, D. | Pitcairn, C.E.R. | Sutton, M.A. | Flechard, C. | Loubet, B. | Coyle, M. | Munro, R.C. (Institute of Terrestrial Ecology, Edinburgh Research Station (United Kingdom))
Design and field operation of an in-situ environmental enclosure for tree branches
1995
Vann, D.R. | Johnson, A.H. (Department of Biology, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (USA))
Effects of nitrogen deposition on field layer vegetation in south Swedish oak forests
1998
Brunet, J. | Diekmann, M. | Falkengren-Grerup, U. (Department of Conservation Biology, Swedish University of Agricultural Sciences, Box 7002, S-750 07 Uppsala (Sweden))
