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结果 1-10 的 18
Some new aspects of macerating and composting of organic matter
1992
Matthias, J. (Georg-August-Universitaet, Goettingen (Germany). Inst. fuer Agrartechnik)
Change in the dendrochemistry of sacred fir close to Mexico City over the past 100 years
1999
Watmough, S.A. | Hutchinson, T.C. (ERS Program, Trent University, Peterborough, Ontario K9J 7B8 (Canada))
Annual growth throughout the whole tree during normal and extreme climatic conditions
1992
Krause, C. (Hamburg Univ. (Germany). Ordinariat fuer Holzbiologie) | Eckstein, D.
Phosphorus availability to corn from wood ash-amended soils
1992
Erich, M.S. (Maine Univ., Orono, ME (USA). Dept. of Plant, Soil and Environmental Sciences) | Ohno, T.
The short-term effects of wood-ash amendment on forest soils
1990
Unger, Y.L. (Maine Univ., Orono, ME (USA). Dept. of Plant and Soil Sciences) | Fernandez, I.J.
Element composition of leaves and wood of beech (Fagus sylvatica L.) on SO(2)-polluted sites of the NE-Bavarian Mountain
1990
Zech, W. (Bayreuth Univ. (Germany, F.R.). Inst. of Soil Science and Soil Geography) | Schneider, B.U. | Roehle, H.
Direct and Indirect effects and the Long-term Risks of Air Pollution on Forest Ecosystems: Forest Decline and Wood Quality
1993
Bues, C.T. | Schulz, H. (University of Munich, (Germany))
The results of numerous investigations in Europe on potential relationships between forest decline caused by immissions and the wood quality of diseased trees consistently showed the technical properties of wood form diseased trees to be unaffected. Wood from diseased trees can be used without reservation.
显示更多 [+] 显示较少 [-]Potassium content in living bark, cambium and wood in relation to electrical resistance and tree condition in the Silver fir (Abies alba Mill.)
1995
Krizaj, B. (Ljubljana Univ. (Slovenia). Biotechnical Fac., Wood Science and Technology Dept.) | Stupar, J. (Jozef Stefan Inst., Ljubljana (Slovenia))
The concentrations of potassium were determined in: (a) the last formed wood, (b) the vascular cambial zone with conductive (noncollapsed) phloem, (c) the youngest nonconductive (collapsed) phloem and the (d) oldest nonconductive phloem, by atomic absorption flame spectroscopy in three unaffected and three heavily affected silver fir (Abies alba Mill.) trees. A commercial conditiometer and own devised Tree Tester were used to determine the electrical resistance (ER). The relationship between the ER of living tissues and K content was investigated. The tissues of unaffected trees were generally characterized by a higher K content and corresponding lower ER. In all trees the K content was highest and ER lowest in the vascular cambial zone with conducting phloem, followed by nonconducting phloem and youngest xylem.
显示更多 [+] 显示较少 [-][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)
[Technological properties of European beech and oak from the forest damage area "Postturm", forest district Farchau/Ratzeburg]
1988
Fruehwald, A. (Hamburg Univ. (Germany, F.R.). Ordinariat fuer Holztechnologie) | Schwab, E.
