خيارات البحث
النتائج 1801 - 1810 من 62,398
A [mathematical] model for uptake of pollutants by vegetation.
1977
O'Dell R.A. | Taheri M. | Kabel R.L.
Supply and demand in training and utilization of professionally qualified air pollution abatement practitioners.
1977
Stinson F.A.
Sampling frequencies for determining long-term average concentrations of atmospheric particulate sulfates [Air pollution].
1977
Tong E.Y. | DePietro S.A.
Plume dispersion in a mountainous river valley during spring [Air pollution, Canada].
1977
Whaley H. | Lee G.K.
Improved ventilation of open top greenhouses [Air pollutants, plant injury].
1976
Kats G. | Thompson C.R. | Kuby W.C.
Evidence of sulfur-bound reduced copper in bamboo exposed to high silicon and copper concentrations النص الكامل
2014
Collin B. | Doelsch E. | Keller C. | Cazevieille P. | Tella M. | Chaurand P. | Panfili F. | Hazemann J.L. | Meunier J.D.
Evidence of sulfur-bound reduced copper in bamboo exposed to high silicon and copper concentrations النص الكامل
2014
Collin B. | Doelsch E. | Keller C. | Cazevieille P. | Tella M. | Chaurand P. | Panfili F. | Hazemann J.L. | Meunier J.D.
We examined copper (Cu) absorption, distribution and toxicity and the role of a silicon (Si) supplementation in the bamboo Phyllostachys fastuosa. Bamboos were maintained in hydroponics for 4 months and submitted to two different Cu (1.5 and 100 mm Cu2þ) and Si (0 and 1.1 mM) concentrations. Cu and Si partitioning and Cu speciation were investigated by chemical analysis, microscopic and spectroscopic techniques. Copper was present as Cu(I) and Cu(II) depending on plant parts. Bamboo mainly coped with high Cu exposure by: (i) high Cu sequestration in the root (ii) Cu(II) binding to amino and carboxyl ligands in roots, and (iii) Cu(I) complexation with both organic and inorganic sulfur ligands in stems and leaves. Silicon supplementation decreased the visible damage induced by high Cu exposure and modified Cu speciation in the leaves where a higher proportion of Cu was present as inorganic Cu(I)S compounds, which may be less toxic. (Résumé d'auteur)
اظهر المزيد [+] اقل [-]Evidence of sulfur-bound reduced copper in bamboo exposed to high silicon and copper concentrations النص الكامل
2014
Collin, Blanche | Doelsch, Emmanuel | Keller, Catherine | Cazevieille, Patrick | Tella, Marie | Chaurand, Perrine | Panfili, Frédéric | Hazemann, Jean-Louis | Meunier, Jean-Dominique
We examined copper (Cu) absorption, distribution and toxicity and the role of a silicon (Si) supplementation in the bamboo Phyllostachys fastuosa. Bamboos were maintained in hydroponics for 4 months and submitted to two different Cu (1.5 and 100 μm Cu2+) and Si (0 and 1.1 mM) concentrations. Cu and Si partitioning and Cu speciation were investigated by chemical analysis, microscopic and spectroscopic techniques. Copper was present as Cu(I) and Cu(II) depending on plant parts. Bamboo mainly coped with high Cu exposure by: (i) high Cu sequestration in the root (ii) Cu(II) binding to amino and carboxyl ligands in roots, and (iii) Cu(I) complexation with both organic and inorganic sulfur ligands in stems and leaves. Silicon supplementation decreased the visible damage induced by high Cu exposure and modified Cu speciation in the leaves where a higher proportion of Cu was present as inorganic Cu(I)S compounds, which may be less toxic.
اظهر المزيد [+] اقل [-]Decision support tool for soil sampling of heterogeneous pesticide (chlordecone) pollution النص الكامل
2014
Clostre F. | Lesueur Jannoyer M. | Achard R. | Letourmy P. | Cabidoche Y.M. | Cattan P.
Decision support tool for soil sampling of heterogeneous pesticide (chlordecone) pollution النص الكامل
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)
اظهر المزيد [+] اقل [-]Decision support tool for soil sampling of heterogeneous pesticide (chlordecone) pollution النص الكامل
2014
Clostre, Florence | Lesueur Jannoyer, Magalie | Achard, Raphaël | Letourmy, Philippe | Cabidoche, Yves-Marie | Cattan, Philippe | Fonctionnement agroécologique et performances des systèmes de cultures horticoles (UPR HORTSYS) ; Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad) | Pôle de Recherche Agro-Environnementale de la Martinique ; Partenaires INRAE | Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad) | Agrosystèmes tropicaux (ASTRO) ; Institut National de la Recherche Agronomique (INRA) | Conseil Régional de la Martinique et Ministère des Outre-Mer (France)
The online version of this article (doi:10.1007/s11356-013-2095-x) contains supplementary material, which is available to authorized users. | International audience | 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.
اظهر المزيد [+] اقل [-]Decision support tool for soil sampling of heterogeneous pesticide (chlordecone) pollution النص الكامل
2014
Clostre, Florence | Lesueur Jannoyer, Magalie | Achard, Raphaël | Letourmy, Philippe | Cabidoche, Yves-Marie | Cattan, Philippe
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.
اظهر المزيد [+] اقل [-]Copper smelters and atmospheric visibility in the southwest, seasonal analysis [Nevada; Utah; Texas; Colorado; Arizona; New Mexico].
1984
Nochumson D.H. | Williams M.D.
Validation of the industrial source complex dispersion model in a rural setting [Air pollution].
1984
Heron T.M. | Kelly J.F. | Haataja P.G.
Using farmers' actions to measure crop loss due to air pollution [Ozone, Illinois].
1984
Mjelde J.W. | Adams R.M. | Dixon B.L. | Garcia P.
