خيارات البحث
النتائج 91 - 100 من 304
Effect of heavy metal pollution on plants
1981
Lepp, N. W. (Nicholas W)
[Phosphorus erosion from arable land [and forest land, snowmelt losses, Sweden]]
1981
Ulen, B.
[Water pollution in Norway [impact of agriculture on supplies of nitrogen and phosphorus to watercourses, eutrophication]]
1981
Lundekvam, H.
[Effects of reduced supplies of plant nutrients to recipients [water pollution, eutrophication]]
1981
Ahl, T.
[Choice of fertilizer application methods [band placement] and fertilization time, and split fertilizer applications [effect on fertilizer utilization, nutrient losses, pollution]]
1981
Siman, G.
[Sedimentation basins in watercourses [lakes, dams, effects of pollution, eutrophication]]
1981
Alasaarela, E.
[Soil phosphorus fractions and biologically available phosphorus in erosion material [soil runoff]]
1981
Persson, G.
[Leaching of plant nutrients [nitrogen, phosphorus, potassium] from cultivated soil in Sweden [pollution, groundwater, surface water]]
1981
Gustafson, A. (Sveriges Lantbruksuniv., Uppsala (Sweden). Avd. foer Vattenvaard)
Species and ecosystem level bioindicators of airborne pollution: an analysis of two major studies
1981
Grodzinski, W. (Jagiellonian Univ., Krakow (Poland). Dept. of Animal Ecology) | Yorks, T.P. (Colorado State Univ., Fort Collins, CO (USA). Natural Resource Ecology Lab.)
Bioindication of air pollution effects has received considerable attention in recent years. It has been almost entirely focused on individual species and relatively little notice has been given to ecosystem level process and function monitors. Longterm research projects in the Niepolomice Forest in southern Poland and the Colstrip area in southeast Montana, U.S.A., were analyzed for both organismic and system level indicators and monitors for SO, trace elements, and fluoride pollution originating in nearby coal-fired industrial processes. Species of lichens exhibited changes in morphology and survival and pine species exhibited pollutant accumulation in needles at both sites. Declines in Scots pine growth in Poland of up to 20% were compared with declines in western wheatgrass rhizome biomass in Montana to illustrate system wide effects on primary productivity. Directly observable declines in decomposition rate were noted for both sites at higher pollution levels and tied to system wide occurrences of nutrient deficiency and toxicant buildup in soil pools. Pollutant increases in deer antler composition, changes in grasshopper dietary patterns, and lichen density and health were postulated to have system level implications as well
اظهر المزيد [+] اقل [-]Effects of SO2 exposure on carbohydrate contents, phytomass and caloric values of wheat plants
1981
Prasad, B.J. | Rao, D.N. (Banaras Hindu Univ., Varanasi (India). Centre of Advanced Study in Botany, Lab. of Ecology)
This paper reports the results of wheat plants exposed to SO(,2). The SO(,2)-treated and control plant samples were periodically analyzed with respect to their carbohydrate content, caloric values, phytomass accumulations and net primary productivity. An initial increase, but later decrease in all these parameters was recorded in SO(,2)-treated plants. These effects in wheat plants have been interpreted in terms of energy budget of plants under SO(,2)-stress condition.
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