خيارات البحث
النتائج 1 - 10 من 10
[Wood-biological studies on stress symptoms and capability of recovery of urban trees in Hamburg]
1988
Petersen, A. | Eckstein, D.
Analysis of tree rings using inductively coupled plasma mass spectrometry to record fluctuations in a metal pollution episode
1996
Watmough, S.A. | Hutchinson, T.C. (Environmental and Resource Studies Program, Trent University, Peterborough, Ontario K9J 7B8, Canada)
Seasonal changes in indole acetic acid content of the cambial region of Norway spruce at the research station "Postturm", forest district Farchau/Ratzeburg, in relation to the degree of forest decline (needle loss) and annual diameter
1992
Scheid, P. (Hamburg Univ. (Germany). Inst. fuer Allgemeine Botanik und Botanischer Garten) | Doerffling, K.
Annual growth throughout the whole tree during normal and extreme climatic conditions
1992
Krause, C. (Hamburg Univ. (Germany). Ordinariat fuer Holzbiologie) | Eckstein, D.
[Dendroecological pre-studies conducted with Norway spruce trees of a North German forest damage area]
1988
Eckstein, D. (Hamburg Univ. (Germany, F.R.). Ordinariat fuer Holzbiologie)
[Anatomical studies on the wood of healthy and diseased Norway spruce trees from a forest damage area, forest district Farchau/Ratzeburg]
1988
Goettsche-Kuehn, H. (Bundesforschungsanstalt fuer Forst-und Holzwirtschaft, Hamburg (Germany, F.R.)) | Bauch, J. | Feuerstack, M.
Defect in formation of annual rings and forest damage due to air pollution in the region of Horna Orava [Slovak Republic]
1995
Dursky, J. (Technicka Univ., Zvolen (Slovakia). Lesnicka Fakulta)
Structural studies of the cell walls in wood of diseased conifers for estimating the wood quality
1986
Fengel, D. (Muenchen Univ. (Germany, F.R.). Inst. fuer Holzforschung)
[Anatomical and physiological studies on urban trees in Hamburg: wood increment - water balance - biomass]
1988
Petersen, A. (Hamburg Univ. (Germany, F.R.). Ordinariat fuer Holzbiologie) | Eckstein, D.
Concentration of chemical elements in the xylem wood of Scots pines growing in different environmental conditions
2000
Paern, H. (Estonian Agricultural Univ., Tartu (Estonia). Forest Research Inst.)
Element concentrations in the xylem wood of Scots pines (Pinus sylvestris L.) growing in different soil and pollution load conditions at Narva-Joesuu and Haeaedemeeste, Estonia, were studied for temporal trends with respect to soil properties. The upper horizons of the Haeaedemeeste stand soil profile were strongly acidic compared with those of Narva-Joesuu, which were weakly acidic. Element concentrations for K, Ca, Mg, Mn and Zn in upper soil horizons were higher at the Narva-Joesuu stand and for Pb at Haeaedemeeste. Concentrations of xylem elements Mg, K, P, Pb and Cu were higher in the Narva-Joesuu sample and of Ca, Mn and Zn in the Haeaedemeeste sample. The concentrations of xylem elements except for K, Mg and Cu were poorly associated with those in soil. The increasing concentrations of Ca, K, P and in the Narva-Joesuu sample during the last decades can be explained by the larger amounts of emissions of the oil-shale fly ash by the neighbouring thermal electric power stations. Thus, the alteration of the concentrations of these elements in the xylem offer a promise for determining deposition-mediated changes in the environment
اظهر المزيد [+] اقل [-]