Refinar búsqueda
Resultados 1811-1820 de 62,157
Controlling cotton gin emmissions [Air pollution filter equipment].
1978
Roddy W.J.
Measurement of ambient odors using dynamic forced-choice triangle olfactometer.
1978
Dravnieks A. | Prokop W.H. | Boehme W.R.
The impact of gold smelter emissions on vegetation and soils of a sub-arctic forest-tundra transition ecosystem [Canada].
1978
Hocking D. | Kuchar P. | Plambeck J.A. | Smith R.A.
Plume dispersion in a mountainous river valley during spring [Air pollution, Canada].
1977
Whaley H. | Lee G.K.
Measuring air pollutant uptake by plants: a direct kinetic technique.
1977
Rogers H.H. | Jeffries H.E. | Stahel E.P. | Heck W.W. | Ripperton L.A. | Witherspoon A.M.
Decision support tool for soil sampling of heterogeneous pesticide (chlordecone) pollution
2014
Clostre F. | Lesueur Jannoyer M. | Achard R. | Letourmy P. | Cabidoche Y.M. | Cattan P.
When field pollution is heterogeneous due to localized pesticide application, as is the case of chlordecone (CLD), the mean level of pollution is difficult to assess. Our objective was to design a decision support tool to optimize soil sampling. We analyzed the CLD heterogeneity of soil content at 0-30- and 30-60-cm depth. This was done within and between nine plots (0.4 to 1.8 ha) on andosol and ferralsol. We determined that 20 pooled subsamples per plot were a satisfactory compromise with respect to both cost and accuracy. Globally, CLD content was greater for andosols and the upper soil horizon (0-30 cm). Soil organic carbon cannot account for CLD intra-field variability. Cropping systems and tillage practices influence the CLD content and distribution; that is CLD pollution was higher under intensive banana cropping systems and, while upper soil horizon was more polluted than the lower one with shallow tillage (<40 cm), deeper tillage led to a homogenization and a dilution of the pollution in the soil profile. The decision tool we proposed compiles and organizes these results to better assess CLD soil pollution in terms of sampling depth, distance, and unit at field scale. It accounts for sampling objectives, farming practices (cropping system, tillage), type of soil, and topographical characteristics (slope) to design a relevant sampling plan. This decision support tool is also adaptable to other types of heterogeneous agricultural pollution at field level. (Résumé d'auteur)
Mostrar más [+] Menos [-]A rainfall simulator for laboratory use in acidic precipitation studies.
1984
Chevone B.I. | Yang Y.S. | Winner W.E. | Storks Cotter I. | Long S.J.
Field surveys of vegetation during a period of rising electric power generation in the Ohio River Valley [Sulfur dioxide].
1984
Jacobson J.S. | Showman R.E.
A statistical trajectory technique for determining air pollution source regions [Air quality in national parks].
1983
Ashbaugh L.L.
Surface ozone and peroxyacetyl nitrate (PAN) observations at rural locations in Alberta, Canada [Air pollution].
1983
Peake E. | MacLean M.A. | Sandhu H.S.
