خيارات البحث
النتائج 1 - 10 من 15
Monitoring polycyclic aromatic hydrocarbons (PAHs) and heavy metals in urban soil, compost and vegetation.
1995
Niederer M. | Maschka Selig A. | Hohl C.
[Forest decline in Federal Republic of Germany [photooxidants, ozone, soil nutrients, "new damage"]]
1987
Prinz, B. (Landesanstalt fuer Immissionsschutz des Landes Nordrhein-Westfalen, Essen (Germany, F.R.)) | Krause, G.H.M.
Effects of nitrogen deposition on tree growth and soil nutrients in boreal scots pine stands
1998
Nissinen, A. | Hari, P. (Department of Forest Ecology, P.O. Box 24, University of Helsinki, 00014 Helsinki (Finland))
Experimental calibration of Ellenberg's indicator value for nitrogen
1998
Wamelink, G.W.W. | Dobben, H.F. van | Eerden, L.J.M. van der (Institute of Forestry and Nature Research, P.O. Box 23, 6700 AA Wageningen (Netherlands))
Interacting effects of nutrients, pH - Al and elevated CO2 on the growth of red spruce (Picea rubens Sarg.) seedlings
1992
Shipley, B. (McGill Univ., Montreal, Que. (Canada). Dept. of Biology) | Lechowicz, M. | Dumont, S. | Hendershot, W.H.
[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)
Mineral nutrient acquisition in nonmycorrhizal and mycorrhizal plants
1995
Marschner, H. (Hohenheim Univ., Stuttgart (Germany). Plant Nutrition Inst.)
Root-induced changes in the rhizosphere and root colonization with mycorrhizal fungi have marked influence on mineral nutrient acquisition from soils. Enhanced exudation of organic acids under phosphorus deficiency is a widespread phenomena in woody species forming root clusters. Root colonization with endomycorrhizas (AM) and ectomycorrhizas (ECM) increases the spatial availability of nutrients in the soil and enhances plant growth particulary on nutrient-poor soils. Most of these studies have been conducted under controlled environmental conditions and with annual plant species mycorrhizal with AM. Conclusions on the role of ECM colonization for nutrient acquisition of trees in forest stands are not possible at the present state of knowledge.
اظهر المزيد [+] اقل [-]Direct and Indirect Effects and the Long-term Risks of Air Pollution on Forest Ecosystems: Effects on Soil Nutrition
1993
Guang-Jing Ma | Bai-Zhong Li | Ping Zhang | Jing-shen Liang (Chinese Academy of Forestry, Wan Shou Shan (China). Research Center for Forest Environment)
Atmospheric pollutant can cause direct effects mediated by foliage and indirect effects mediated through soil. Biotic and abiotic factors can confound relationships among nutrient cycling, growth loss and mortality and air pollution. Changes in the soils could result from acidic deposition. Changes could include increased fertility as a result of sulphur and nitrogen input to soils that are deficient in these elements or decreased fertility through ion leaching or mobilization of toxic substances as aluminium.
اظهر المزيد [+] اقل [-]Effect of mineral nutrient supply and light intensity on root growth, root morphology, and nutrient uptake of Norway spruce
1996
Seith, B. | George, E. | Marschner, H.
Pedologic and nutritional aspects of enhanced carbon-dioxide storage in forest ecosystems
1993
Huettl, R.F. (Forestry Dept. Kali and Salz AG, Kassel (Germany))
Enhanced forest growth in combination with relatively high Nitrogen deposition may result in further pedologic and nutritional changes and an even greater destabilisation of forest ecosystems.
اظهر المزيد [+] اقل [-]