Crotalaria incana L. and Leucaena leucocephala Lam. (Leguminosae) as indicators of toxicity by petroleum hydrocarbons in soil
This study assesses the toxic effects produced by a Gleysol molic soil contaminated with crude oil on seedlings of two species of legumes. A phytotoxic impact index (IIF) was generated, which includes five parameters measured by relative rates of impact (IRIF(x)) for variables; emergency, height, ro...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2010 |
| País: | México |
| Institución: | UNIVERSIDAD NACIONAL AUTÓNOMA DE MÉXICO |
| Repositorio: | Revista Internacional de Contaminación Ambiental |
| Idioma: | español |
| OAI Identifier: | oai:ojs.pkp.sfu.ca:article/20455 |
| Acceso en línea: | https://www.revistascca.unam.mx/rica/index.php/rica/article/view/20455 |
| Access Level: | acceso abierto |
| Palabra clave: | EC50 crude oil phytotoxicity index soil pollution total petroleum hydrocarbons CE50 contaminación del suelo índice de fitotoxicidad petróleo crudo |
| Sumario: | This study assesses the toxic effects produced by a Gleysol molic soil contaminated with crude oil on seedlings of two species of legumes. A phytotoxic impact index (IIF) was generated, which includes five parameters measured by relative rates of impact (IRIF(x)) for variables; emergency, height, root length, aboveground biomass and root biomass. Bioassays were conducted under a completely randomized design with three replications under semi-controlled conditions, to assess the sensitivity of Leucaena leucocephala and Crotalaria incana at different concentrations of HTP (total petroleum hydrocarbons). Effects were highly significant (P ≤ 0.01) with increasing concentrations of HTP in substrate. The emergence of L. leucocephala was 29 % lower with 80 000 mgkg-1 HTP, while C. incana decreased 30 % with 32 000 mgkg-1 HTP respect to control. Both species showed a five-day delay in the emergence of seedlings when exposed to high levels of HTP. A significant decrease in the accumulation of dry matter (DM) at concentrations above 20 000 mgkg-1 HTP was observed in both species. The respective IIF declined of 50 % with 80 000 and 25 000 mgkg-1 TPH, but L. leucocephala had no significant effect with 10 000 mgkg-1 TPH. Finally, the EC50 in L. leucocephala, is presented with 80 000 mgkg-1 TPH whereas in C. incana this parameter is noted from 25 000 mgkg-1 TPH. |
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