Influence of surface-water irrigation on the distribution of organophosphorus pesticides in soil-water systems, Jianghan Plain, central China. (1st March 2021)

• Record Type: Journal Article
• Authors: Wang, Jianwei; Zhang, Caixiang; Liao, Xiaoping; Teng, Yanguo; Zhai, Yuanzheng; Yue, Weifeng
• Is Part Of: Journal of environmental management. Volume 281(2021)
• Publication Date: 2021-03-01
• Subjects: Organophosphorus pesticides -- Surface-water irrigation -- Distributions -- Fluvisols -- Water -- Jianghan plain; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2020.111874
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: Surface-water irrigation is one of the most important irrigation methods in areas with abundant surface water. Although this method of irrigation is both economical and convenient, many contaminants are also introduced into the soil-water systems such as organophosphorus pesticides (OPPs). To study the influence of surface-water irrigation on the distribution of OPPs in soil-water systems, 42 water samples (38 groundwater and four surface water) and 85 soil samples (78 profile soil samples and seven topsoil samples) were taken from Shahu in the Jianghan Plain, China. Shahu is a typical Chinese surface-water irrigation district. During sampling, three types of areas were considered: surface-water irrigated areas, groundwater-irrigated areas away from rivers, and non-irrigated areas adjacent to rivers. The results showed that the concentrations of OPPs in the groundwater and soil in the surface-water irrigated farmland were higher than those in groundwater-irrigated farmland. The groundwater flow field and surface-water irrigation were responsible for the OPPs. Thus, it is clear that the surface-water irrigation had a strong influence on the distribution of OPPs in soil-water systems. Principal component analysis for OPPs content in groundwater showed that the key influencing factors on the distribution of OPPs in groundwater were the groundwater flow field and current pesticide use. Graphical abstract: Image 1 Highlights: Methamidophos, Diazinon and Omethoate were the main OPPs in the soil-water system. OPPs in the topsoil and subsoil had adverse effects to the safety of agricultural products. OPPs in the subsoil and groundwater had significant spatial distribution characteristics. Surface-water irrigation influenced the distribution of OPPs in the study area. Groundwater flow field and current pesticide use were two major influencing factors.