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Результаты 321-329 из 329
The feasibility of an environmental research institute and the Pollution Prosecution Act of 1990
1990
Screening methods for groundwater pollution potential from pesticide use in Colorado agriculture
1990
Durnford, Deanna S.
Review of potentially harmful substances: Nutrients
1990
The state of the marine environment
1990
Review of potentially harmful substances: choosing priority organochlorines for marine hazard assessment
1990
Report of the twentieth session (of GESAMP)
1990
Eutrophication along the french coasts
1990
Menesguen, Alain
The French coasts exhibit two kiruJs of eutrophicati.on; the prolif erati.on of green macroa/gae (Ulva sp.) affects the very shallow Mediterranean /agoons as we/1 as a lot of widely open beaches in Brittany, whereas phytoplanktonic mass blooms are to be f ound in front of the large estuaries and in some Atlantic -embayments. Bath these types of eutrophicati.on seem to have increased during the fast twenty years, probably in relation with the increase of the nutrients /oadings from agriculture and sewage. However, the severity of eutrophicati.on is not on/y related to the absolute amount of /oadings. The local residence time of the waters, deduced from hydrodynamics, is a crucial parameter; numerica/ mode/s have highlighted the raie of tidal residua/ circulation. Reduction of eutrophicati.on requires a precise knowledge of the in-situ limiting nutrient. If green macroalgae are c/early nitrogen limited, phytoplankton may be either phosphorus or nitrogen limited. Ecological numerical mode/s may help to quanti/y the effects of various strategies of lowering the loadings of nutrients.
Показать больше [+] Меньше [-]Rapport. Groupe Mixte d' Experts OMI/FAO/UNESCO/OMM/OMS/AIEA/ONU/PNUE Charge d' Etudier les Aspects Scientifiques de la Pollution des Mers. Sess. 20.
1990
Protection et gestion des oceans: principes sous-jacents et elements de la protection et de la gestion des milieux marin et cotier.
1990
