Department of Agricultural and Environmental Engineering, United Graduate School of Agricultural Science, Tokyo University of Agriculture and Technology, Tokyo, Japan.
Research Center of Climate Change, Nong Lam University, HoChiMinh, Vietnam.
Pest Manag Sci. 2018 Nov;74(11):2520-2529. doi: 10.1002/ps.4934. Epub 2018 Jun 1.
The Soil and Water Assessment Tool combined with Pesticide Concentration in Paddy Field (PCPF-1@SWAT) model was previously developed to simulate the fate and transport of rice pesticides in watersheds. However, the current model is deficient in characterizing the rice paddy area and is incompatible with the ArcSWAT2012 program. In this study, we modified the original PCPF-1@SWAT model to develop a new PCPF-1@SWAT2012 model to address the deficiency in the rice paddy area and utilizing the ArcSWAT2012 program. Next, the new model was applied to the Sakura River watershed, Ibaraki, Japan in order to simulate the transport of four herbicides: mefenacet, pretilachlor, bensulfuron-methyl and imazosulfuron.
The results showed that the water flow rate simulated by PCPF1@SWAT2012 was similar with the observed data. The calculated Nash-Sutcliffe efficiency coefficient (NSE) (0.73) and percent bias (PBIAS) (-20.38) suggested satisfactory performance of the model. In addition, the concentrations of herbicides simulated by the PCPF-1@SWAT2012 model were in good agreement with the observed data. The statistical indices NSE and root mean square error (RMSE) estimated for mefenacet (0.69 and 0.18, respectively), pretilachlor (0.86 and 0.18, respectively), bensulfuronmethyl (0.46 and 0.21, respectively) and imazosulfuron (0.64 and 0.28, respectively) indicated satisfactory predictions.
The PCPF-1@SWAT2012 model is capable of simulating well the water flow rate and transport of herbicides in this watershed, comprising different land use types, including a rice paddy area. © 2018 Society of Chemical Industry.
土壤和水评估工具结合稻田中的农药浓度（PCPF-1@SWAT）模型先前被开发用于模拟流域中水稻农药的命运和迁移。然而，目前的模型在描述稻田区域方面存在不足，并且与 ArcSWAT2012 程序不兼容。在本研究中，我们修改了原始的 PCPF-1@SWAT 模型，开发了一个新的 PCPF-1@SWAT2012 模型，以解决稻田区域的不足，并利用 ArcSWAT2012 程序。接下来，将新模型应用于日本茨城县的樱川流域，以模拟四种除草剂：甲草胺、丙草胺、苄嘧磺隆和异丙隆的迁移。
结果表明，PCPF1@SWAT2012 模拟的水流速率与观测数据相似。计算得出的纳什-苏特克里夫效率系数（NSE）（0.73）和偏度百分比（PBIAS）（-20.38）表明模型表现良好。此外，PCPF-1@SWAT2012 模型模拟的除草剂浓度与观测数据吻合良好。甲草胺（0.69 和 0.18）、丙草胺（0.86 和 0.18）、苄嘧磺隆（0.46 和 0.21）和异丙隆（0.64 和 0.28）的统计指标 NSE 和均方根误差（RMSE）分别表明预测结果令人满意。
PCPF-1@SWAT2012 模型能够很好地模拟该流域不同土地利用类型（包括稻田）的水流速率和除草剂迁移。© 2018 英国化学学会。
