Spatial Relationships Between Water Quality and Pesticide Application Rates in Agricultural Watersheds
| Autor: | Brian S. Anderson, Val Connor, John W. Hunt, Brian Fulfrost, Dustin Mulvaney, Mark Angelo, Karen Worcester, Amanda Bern, Bryn M. Phillips, Nancy Richard, Ronald S. Tjeerdema |
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| Rok vydání: | 2006 |
| Předmět: |
Hydrology
Geologic Sediments Nitrates Watershed Pesticide application Agriculture General Medicine Management Monitoring Policy and Law Pesticide Pollution California chemistry.chemical_compound Rivers chemistry Chlorpyrifos Water Pollution Chemical Environmental science Water quality Pesticides Water pollution Surface runoff Surface water Environmental Monitoring General Environmental Science |
| Zdroj: | Environmental Monitoring and Assessment. 121:245-262 |
| ISSN: | 1573-2959 0167-6369 |
| DOI: | 10.1007/s10661-005-9118-0 |
| Popis: | Pesticide applications to agricultural lands in California, USA, are reported to a central data base, while data on water and sediment quality are collected by a number of monitoring programs. Data from both sources are geo-referenced, allowing spatial analysis of relationships between pesticide application rates and the chemical and biological condition of water bodies. This study collected data from 12 watersheds, selected to represent a range of pesticide usage. Water quality parameters were measured during six surveys of stream sites receiving runoff from the selected watershed areas. This study had three objectives: to evaluate the usefulness of pesticide application data in selecting regional monitoring sites, to provide information for generating and testing hypotheses about pesticide fate and effects, and to determine whether in-stream nitrate concentration was a useful surrogate indicator for regional monitoring of toxic substances. Significant correlations were observed between pesticide application rates and in-stream pesticide concentrations (p0.05) and toxicity (p0.10). In-stream nitrate concentrations were not significantly correlated with either the amount of pesticides applied, in-stream pesticide concentrations, or in-stream toxicity (all p0.30). Neither total watershed area nor the area in which pesticide usage was reported correlated significantly with the amount of pesticides applied, in-stream pesticide concentrations, or in-stream toxicity (all p0.14). In-stream pesticide concentrations and effects were more closely related to the intensity of pesticide use than to the area under cultivation. |
| Databáze: | OpenAIRE |
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