State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China; College of Water Sciences, Beijing Normal University, Beijing, 100875, China.
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan, 430074, China.
J Environ Manage. 2021 Mar 1;281:111874. doi: 10.1016/j.jenvman.2020.111874. Epub 2020 Dec 29.
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.
地表灌溉是水资源丰富地区最重要的灌溉方式之一。虽然这种灌溉方法既经济又方便，但许多污染物也会被引入土壤-水系统，如有机磷农药（OPPs）。为了研究地表灌溉对土壤-水系统中 OPPs 分布的影响，在中国江汉平原的沙湖采集了 42 个水样（38 个地下水和 4 个地表水）和 85 个土壤样（78 个剖面土壤样和 7 个表土样）。沙湖是中国典型的地表灌溉区。在采样过程中，考虑了三种类型的区域：地表水灌溉区、远离河流的地下水灌溉区和靠近河流的非灌溉区。结果表明，地表水灌溉农田的地下水和土壤中 OPPs 的浓度高于地下水灌溉农田。地下水流动场和地表水灌溉是 OPPs 的成因。因此，地表灌溉对土壤-水系统中 OPPs 的分布有很强的影响。地下水 OPPs 含量的主成分分析表明，地下水 OPPs 分布的关键影响因素是地下水流动场和当前农药的使用。
