National assessment of spatiotemporal loss in agricultural pesticides and related potential exposure risks to water quality in China

文献类型： 外文期刊

第一作者： Sun, Cheng

作者： Sun, Cheng;Chen, Lei;Jiang, Yue;Wang, Kai;Jiao, Cong;Shen, Zhenyao;Zhai, Limei;Liu, Hongbin

作者机构：

关键词： Pesticide loss; Exposure risk; Water quality; Spatiotemporal distribution; Cropping pattern; Nonpoint source pollution

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2019 年 677 卷

页码：

收录情况： SCI

摘要： Pesticide loss during agricultural development has a serious effect on related water quality, and the critical concern is quantifying the potential exposure risks that pesticide loss pose to water quality at the national scale. In this study, an integrated assessment framework is proposed to scale emission factors from 232 monitoring plots to the national scale, while also considering the physicochemical properties of pesticides in dissolved or adsorbed forms. Based on the results of this study, the total pesticide emissions increased by 29.39% from 146.55 tons in 2004 to 189.62 tons in 2013 and the average loss intensities of insecticides, herbicides and fungicides were 35.25 g/km(2), 44.24 g/km(2) and 48.57 g/km(2). respectively. Central and Southeastern China are identified as hotspots for pesticide loss, while the proportions of high or extremely high-risk areas mainly comprise >50% of farmland. In addition, single-field crops and single-crop rice are the major cropping patterns for pesticide loss in Northern and Southern China. Our results identify key areas for the management of pesticides at the national scale and have direct implications for environmental policies on reducing the potential exposure risk of agricultural pesticides to water quality. (C) 2019 Elsevier B.V. All rights reserved.

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