خيارات البحث
النتائج 1 - 6 من 6
L' etat des forets en Europe.
1994
Haemmerli F. | Vogel J. | Volz R.
[State of forests in Europe]
1994
Haemmerli, F. | Vogel, J. | Volz, R.
Direct and Indirect Effects and the Long-term Risks of Air Pollution on Forest Ecosystems: A Call for Caution in Proper Diagnosis of Causes
1993
Skelly, J.M. (The Pennsylvania State University, (USA). Department of Plant Pathology)
Forest Scientists must recognize that numerous diseases and insect occurrences as well as more subtle environmental stresses are prevalent as causes of changes in forest health. Their interactions often lead to "natural" declines of individual tree species or site-species declines of multiple species. The role of air pollution should be carefully investigated in an integrative sense with these other endemic and sometimes epidemic outbreaks of biotic agents and environmental stresses.
اظهر المزيد [+] اقل [-]Air Pollution and Forest Condition in Central Europe
1993
Kandler, O. (University of Munich, Munich (Germany).Botanical Institute of University of Munich)
Depending on their concentrations, air pollutants are dangerous to forests. With the exception of some industrial areas in the east, concentrations of air pollutants in Central Europe are below the damaging threshold as shown by the records of the monitoring stations.
اظهر المزيد [+] اقل [-]Forestry and society-oriented research on the history of virgin forests and their future needs
1995
Mlinsek, D. (Ljubljana Univ. (Slovenia). Biotechnical Fac., Forestry Dept.)
