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Resultados 151-160 de 282
Improvement of a wet process for the separation of aerosols
1993
Schenkel, A. (GEA Wiegand GmbH, Ettlingen (Germany))
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.
Composting and reed beds for aerobic treatment of livestock wastes
1993
Biddlestone, A.J. | Gray, K.R. | Thayanithy, K. (School of Chemical Engineering, University of Birmingham, PO Box 363, Edgbaston, Birmingham, B15 2 TT (United Kingdom))
The "Black Triangle". A general reader
1993
Pape, R. (comp.)
[Interest and limits of the use of sludges from wastewater treatment in agriculture]
1993
Perrin, D. (Faculte des Sciences Agronomiques de Gembloux (Belgium). Unite de Biologie Vegetale)
[Agricultural use of wastewaters from the agroindustrial sector]
1993
Xanthoulis, D. (Faculte des Sciences Agronomiques de Gembloux (Belgium). Unite d'Hydraulique Agricole)
Direct and Indirect effects of Air Pollution on Forest Ecosystems: the Attempt of a Resume of Scientific Investigations Carried out in Nortrhine-Westphalia/FRG during the last Decade
1993
Prinz, B. (Landesansalt fuer Immissionsschutz, Essen (Germany))
Since the beginning of the 80's, a wide-spread damage to Norway spruce has occurred, mainly characterized by the light-induced decay of chlorophyll in magnesium-deficient needles. Damage also occurs in deciduous trees, especially in beech. To clarify the causes of the damage in Northrine-Wesphalian forests, extensive investigations have been carried out, which combined experimental techniques and epidemiologically orientated surveys.
Mostrar más [+] Menos [-]Potential Impacts of Climate Change on Forests in China
1993
Deying Xu (Chinese Academy of Forestry, Beijing (China))
Experimental research on the physiology of tree seedlings under simulated climate and doubled carbon dioxide can rarely be extrapolated to grown forests. Climatological research has demonstrated a warming trend in the north and a cooling trend in the south of China. However, the changing climate has not caused the death of forests. Projecting the impact of climate change on forest distribution and growth using current GCMs seems to be the only method available.
Mostrar más [+] Menos [-]Direct Effects on Boreal Forest Trees in Northern Europe
1993
Koski, V. (Finnish Forest Research Institute, Vantaa (Finland). Department of Forest Ecology)
Northern species not only tolerate but even benefit vegetatively from a slightly warmer climate than they have been adapted to. If the climatic warming remains below 5 celsius in annual mean temperature, the present forest will not be subject to direct disaster. Reproductive processes are likely to be enhanced through increased flowering and better seed maturation. There are few empirical studies on reproductive biology in new environments.
Mostrar más [+] Menos [-]Indirect effects and the Long-term Risks of Air Pollution on Eastern North American Temperate Forest Ecosystems: Insect Outbreaks
1993
Chappelka, A.H. (Auburn University, Alabama (USA). School of Forestry)
Air pollutants cause subtle changes in natural resistance that can prediscope plants to insect attack. The majority of reports in the area of plant-pollutant-insect interactions have been correlative in nature. In the last ten years, there has emerged a growing body of literature, the vast majority with herbaceous crops, reporting on cause-effect relationships among insects and their hosts.
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