| Autor: |
Ponggumnerd, Doungpond, Mohanasundaram, S., Pradhan, Pragya, Babel, Mukand S., Shrestha, Sangam, Ninsawat, Sarawut |
| Zdroj: |
Modeling Earth Systems and Environment; 20240101, Issue: Preprints p1-27, 27p |
| Abstrakt: |
Intensive use of agrochemicals and pesticides in agriculture leads to environmental degradation and toxic to human health. The present study assesses the spatiotemporal variations of five highly used pesticides namely Ametryn, Atrazine, Diuron, Glyphosate, and Paraquat in Northeast of Thailand. Eighteen Thai Meteorological Department (TMD) weather station sites from Northeast of Thailand were considered to model flow and transport of pesticide chemicals through multi-layered soils using a process based HYDRUS-1D model in this study. We have used reliable climatic datasets from TMD, soil properties from Harmonised World Soil Database, pesticide properties from Pesticides Properties DataBase, and global soil moisture datasets from Global Land Data Assimilation System to assess the pesticide leaching risk. HYDRUS-1D model validation performance was highly satisfactory with root mean square error values less than 0.05 and with a percent bias range of − 10 to 10% at 72% of the total selected sites in the study area. The simulated concentration from bottom of the soil profile for Diuron and Ametryn pesticides were exceeding a threshold concentration of 1 µg/L at few TMD sites in the study area. The leaching risk assessment reveals that Ametryn and Diuron shows high risk of leaching in the northeastern part of the study area while other pesticides, Atrazine, Glyphosate and Paraquat, leaching risk were classified from very low to no risk. |
| Databáze: |
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