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Resultados 121-130 de 281
Marine pollution and international law
1993
Brubaker, Douglas
Diurnal and seasonal carbon dioxide exchange and its components in temperate grasslands in the Netherlands - an outline of the methodology.
1993
Dirks, B.O.M.
Factors influencing the uptake of PCBs and DDTs in red mullet (Mullus barbatus) from Pagassitikos Gulf, Central Greece
1993
Vassilopoulou, V. | Georgakopoulos-Gregoriades, E. (National Centre for Marine Research, Hellenikon 166 04 (Greece))
Measuring pollution prevention progress proceedings
1993
Adrenocortical hyperplasia, disease and chlorinated hydrocarbons in the harbour porpoise (Phocoena phocoena)
1993
Kuiken, T. | Hofle, U. | Bennett, P.M. | Allchin, C.R. | Kirkwood, J.K. | Baker, J.R. | Appleby, E.C. | Lockyer, C.H. | Walton, M.J. | Sheldrick, M.C. (Veterinary Science Group, Institute of Zoology, Zoological Society of London, Regent's Park, London NW1 4RY (United Kingdom))
Agricultural sources and sinks of carbon Texto completo
1993
Cole, C Vernon | Flach, Klaus | Lee, Jeffrey | Sauerbeck, Dieter | Stewart, Bobby
Most existing agricultural lands have been in production for sufficiently long periods that C inputs and outputs are nearly balanced and they are neither a major source nor sink of atmospheric C. As population increases, food requirements and the need for more crop land increase accordingly. An annual conversion of previously uncultivated lands up to 1.5 x 10⁷ hectares may be expected. It is this new agricultural land which suffers the greatest losses of C during and subsequent to its conversion. The primary focus for analysis of future C fluxes in agroecosystems needs to be on current changes in land use and management as well as on direct effects of CO2 and climate change. A valid assessment of C pools and fluxes in agroecosystems requires a global soils data base and comprehensive information on land use and management practices. A comprehensive effort to assemble and analyze this information is urgently needed.
Mostrar más [+] Menos [-]Development and application of a quasi-continuously working system for measuring the immission of acid air pollutants like HCl, NO2 and SO2 using an active collector. Pt. 2
1993
Weisweiler, W. (Karlsruhe Univ. (Germany). Inst. fuer Chemische Technik) | Gromes, B. | Creutznacher, H.
Model studies on heterogeneous reactions of organic components within aerosols and their influence on the condensation of water: Surface-analytical investigations on the water up-take of fly-ashes before and after exposition to fluoranthene and toluene
1993
Faude, F. (Kernforschungszentrum Karlsruhe (Germany). Inst. fuer Radiochemie) | Goschnick, J.
Pollutants exclusion experiment on spruce trees at the Edelmannshof site. Basic measurements and material turnover
1993
Evers, F.H. | Hoyer, V. | Kottke, J. | Quian, M. | Schnepf, M. | Seufert, G.
The effects of different fertilizers on the ciliate communities of forests
1993
Lehle, E. (Ulm Univ. (Germany). Abt. Oekologie und Morphologie der Tiere) | Funke, W.
