Pesticides in fluvial wetlands catchments under intensive agricultural activities |
| |
Authors: | Poissant Laurier Beauvais Conrad Lafrance Pierre Deblois Christian |
| |
Affiliation: | Direction des Sciences & Technologie, Environnement Canada, 105 McGill, 7e étage (Youville), Montréal, QC, Canada H2Y 2E7. |
| |
Abstract: | A survey on pesticides (73 compounds) in the Bay St. Fran?ois wetland and its catchment (part of the wetlands of Lake St. Pierre area St. Lawrence River, Québec]) was achieved in 2006. The metabolites as well as the active ingredients of pesticides (11 compounds) were detected in the wetland and its catchment. This wetland ecosystem was active in the degradation of agricultural pesticides (e.g., atrazine). The measured pesticides were individually below the criteria for aquatic species in natural water, except chlorpyrifos. Overall, the pesticides lost from agricultural field towards the streams were <1% of the quantity applied. The environmental fates of the pesticides were found to vary according to the size of the watershed. Over large catchments, half-life times were important in terms of global loss from the agricultural lands to wetlands whereas over small catchments, soil organic carbon/water distribution coefficient (Koc) was an important term for pesticides losses to water system since half-life times were not limiting factors. |
| |
Keywords: | Pesticides Agricultural Losses from field Wetlands impacts |
本文献已被 ScienceDirect PubMed 等数据库收录! |
|