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Результаты 11-20 из 230
Hierarchy theory as a guide to mycorrhizal research on large-scale problems.
1991
O'Neill E.G. | O'Neill R.V. | Norby R.J.
Historical changes of soil metal background values in select areas of China.
1991
Li J. | Wu Y.
On the bonding of manganese, copper and cadmium to peptides of the xylem sap of plant roots.
1991
Przemeck E. | Haase N.U.
Indices of metal tolerance in trees.
1991
Turner A.P. | Dickinson N.M. | Lepp N.W.
Response of freshwater algae (Scenedesmum spp.) to phenylurea herbicides.
1991
El Dib M.A. | Shehata S.A. | Abou Waly H.F.
Photooxidation of carbonyl sulfide (SCO) by ozone studies of the reaction mechanisms in the gas phase and solid argon matrices
1991
Jaeger, K. | Weller, Rolf | Schrems, Otto
Nutritional status of declining spruce (Picea abies (L.) Karst.) - Effect of soil organic matter turnover rate
1991
Hambuckers, Alain | Remacle, Jean
peer reviewed | Foliar analysis was undertaken in two plots of Picea abies (L.) Karst., located in a watershed of Haute Ardenne, Belgium, in order to estimate the decline of the trees. Apart from a general Mg deficiency, the concentrations of the needles were in the same range as those determined in other European stands. Comparisons between healthy and declining trees within each plot revealed a general pattern of decline similar to that observed elsewhere in Western Europe. This was shown as lower Ca, Mg, Zn concentrations and water content and higher N and P concentrations of the needles collected from declining trees. It is concluded that this decline could be due to N over fertilization by the atmospheric deposition. The difference of decline between the two plots was attributed to the turnover rate of the soil organic layer which was less intensive in the most damaged plot.
Показать больше [+] Меньше [-]Water pollution | Nonindustrial wastewater pollution can be better managed
1991
Pollution prevention | Meeting the environmental challenges of the 1990s
1991
