خيارات البحث
النتائج 221 - 225 من 225
Evaluating ozone air pollution effects on pines in the western United States
1996
Historical and technical background is provided about ozone air pollution effects on ponderosa (Pinus ponderosa Dougl. ex Laws) and Jeffrey (P. jeffreyi Grev. and Balf.) pines in forests of the western United States. The principal aim is to document the development of field survey methods to be applied to assessment of chronic ozone injury by government agencies responsible for management of forest and air resources, primarily in the Sierra Nevada and mountains of southern California. Detailed procedures are supplied for the selection of sample plots, collection of plot and tree data, computation of an injury index for each tree and execution of quality assurance procedures. The methods have been field tested in California National Forests and National Parks during 4 consecutive years.
اظهر المزيد [+] اقل [-][Report. IMO/FAP/UNESCO/WMO/WHO/IAEA/UN/UNEP Joint Group of Experts on the Scientific Aspects of Marine Pollution] | 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. 26
1996
Forestry-related nonpoint source pollution in Maine
1996
Stafford, Craig | Briggs, Russell D. | Leathers, Mark
Mathematical modeling of groundwater pollution | Di xia shui wu ran--shu xue mo xing he shu zhi fang fa. English
1996
Sun, Ne-Zheng
Idaho water quality policy for nonpoint source pollution
1996
O'Laughlin, Jay
