خيارات البحث
النتائج 121 - 130 من 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 النص الكامل
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.
اظهر المزيد [+] اقل [-]A field study of radiation fog. The chemical composition of interstitial aerosol and droplet residues
1993
Gieray, R. (Hohenheim Univ. (Germany). Inst. fuer Physik) | Wieser, P.
Development and application of methods for the evaluation of air pollutant emissions and emission reduction scenarios
1993
John, C. (Stuttgart Univ. (Germany). Inst. fuer Energiewirtschaft und Rationelle Energieanwendung (IER)) | Berner, P. | Friedrich, R. | Obermeier, A. | Seier, J.
Analysis of the concentration of PAH and PCB in the ambient air of Halle
1993
Hahne, F. (Landesamt fuer Umweltschutz Sachsen-Anhalt, Halle (Germany)) | Schumann, H.
Climatic variation and growth of Norway spruce (Picea abies (L.) Karst.), silver fir (Abies alba Mill.) and beech (Fagus silvatica L.) in southwestern Germany
1993
Kahle, H.P. (Freiburg Univ. (Germany). Inst. fuer Waldwachstum) | Hahn, D. | Spiecker, H.
