Refinar búsqueda
Resultados 91-100 de 306
[Effects of reduced supplies of plant nutrients to recipients [water pollution, eutrophication]]
1981
Ahl, T.
Effect of heavy metal pollution on plants
1981
Lepp, N. W. (Nicholas W)
[Leaching of plant nutrients [nitrogen, phosphorus, potassium] from cultivated soil in Sweden [pollution, groundwater, surface water]]
1981
Gustafson, A. (Sveriges Lantbruksuniv., Uppsala (Sweden). Avd. foer Vattenvaard)
[Phosphorus erosion from arable land [and forest land, snowmelt losses, Sweden]]
1981
Ulen, B.
[Sedimentation basins in watercourses [lakes, dams, effects of pollution, eutrophication]]
1981
Alasaarela, E.
[Choice of fertilizer application methods [band placement] and fertilization time, and split fertilizer applications [effect on fertilizer utilization, nutrient losses, pollution]]
1981
Siman, G.
[Soil phosphorus fractions and biologically available phosphorus in erosion material [soil runoff]]
1981
Persson, G.
[Water pollution in Norway [impact of agriculture on supplies of nitrogen and phosphorus to watercourses, eutrophication]]
1981
Lundekvam, H.
Ozone treatment for industrial wastewater.
1981
Rice R. G. | Browning Myron E.
The role of atmospheric deposition in an eastern U.S. deciduous forest
1981
Lindberg, S.E. (Oak Ridge National Lab., Oak Ridge, TN (USA). Environmental Sciences Div.) | Hariss, R.C.
Atmospheric sources contributed significantly to the annual flux of trace metals and sulfate to the forest floor of Walker Branch Watershed, a forested catchment in the southeastern United States. Atmospheric deposition supplied from 14%(Mn) to approx. 40%(Zn, Cd, SO(,4)('2-)) to 99%(Pb) of the annual flux to the forest floor; the remainder was attributable to internal element cycling. The measured water solubility of these metals in suspended and deposited particles indicates that they may be readily mobilized following deposition. Dry deposition constituted a major fraction of the total annual atmospheric input of Cd and Zn(20%), SO(,4)('2-)(35%), Pb(55%), and Mn(90%); however, wet deposition rates for single events exceeded dry deposition rates by one to four orders of magnitude. Interception of rain by the canopy resulted in loss of Cd, Mn, Pb, Zn, and SO(,4)('2-) from the canopy, but uptake of H('+) which increased with increasing free acidity of the incoming rain, and with increasing residence time of the rain on the leaf surface
Mostrar más [+] Menos [-]