Kannan Narayanan, White Sue M, Worrall Fred, Whelan Mick J
Blackland Research and Extension Center, Temple, TX 76502, USA.
J Environ Sci Health B. 2006;41(7):1049-70. doi: 10.1080/03601230600850804.
Pesticides in stream flow from the 142 ha Colworth catchment in Bedfordshire, UK were monitored from October 1999 to December 2000. About 47% of the catchment is tile-drained and different pesticides and cropping patterns have recently been evaluated in terms of their effect on nutrient and pesticide losses to the stream. The data from Colworth were used to test soil and water assessment tool (SWAT) 2000 predictions of pesticide concentrations at the catchment outlet. A sound model set-up to carry out pesticide modelling was created by means of hydrological modelling with proper simulation of crop growth and evapotranspiration. The pesticides terbuthylazine, terbutryn, cyanazine and bentazone were modelled. There was close agreement between SWAT-predicted pesticide concentration values and observations. Scenario trials were conducted to explore management options for reducing pesticide loads arriving at the catchment outlet. The results obtained indicate that SWAT can be used as a tool to understand pesticide behavior at the catchment scale.
1999年10月至2000年12月期间，对英国贝德福德郡142公顷的科尔沃思集水区内溪流中的农药进行了监测。该集水区约47%的区域采用了瓷砖排水系统，近期已针对不同农药及种植模式对溪流养分和农药流失的影响进行了评估。利用科尔沃思的数据对土壤和水评估工具（SWAT）2000模型预测的集水区出口处农药浓度进行了检验。通过水文建模，并对作物生长和蒸散进行适当模拟，构建了一个用于农药建模的合理模型设置。对农药特丁津、特丁净、氰草津和灭草松进行了建模。SWAT预测的农药浓度值与观测结果高度吻合。开展了情景试验，以探索减少进入集水区出口处农药负荷的管理方案。所得结果表明，SWAT可作为一种工具，用于了解集水区尺度上的农药行为。
