文献类型： 外文期刊

作者： Hui, Kunlong ¹ ; Xi, Beidou ¹ ; Tan, Wenbing ¹ ; Song, Qidao ⁴ ;

作者机构： 1.Chinese Res Inst Environm Sci, State Key Lab Environm Criteria & Risk Assessment, Beijing 100012, Peoples R China

2.Chinese Res Inst Environm Sci, State Environm Protect Key Lab Simulat & Control G, Beijing 100012, Peoples R China

3.Guizhou Inst Technol, Sch Chem Engn, Guiyang 550003, Peoples R China

4.Chinese Acad Trop Agr Sci, Inst Sci & Tech Informat, Haikou 571101, Peoples R China

5.8 Dayangfang Beiyuan Rd, Beijing 100012, Peoples R China

6.4 West Xueyuan Rd, Haikou 571101, Peoples R China

关键词： Nitrogen input; Soil microenvironment; Sewage irrigation area; Dissolved organic matter; Polycyclic aromatic hydrocarbons

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：8.431； 五年影响因子：8.399 ）

ISSN： 0013-9351

年卷期： 2022 年 215 卷

页码：

收录情况： SCI

摘要： Soil is a key component of terrestrial ecosystems, as it provides nutrients and energy for all terrestrial organisms and is the site of various physical, chemical, and biological processes. Soil organic matter is particularly important for the role that it plays in element cycling, as well as the adsorption and degradation of soil pollutants. Nitrogen (N) fertilizer is an important nutrient element in the soil microenvironment. Applications of N fertilizer can improve soil quality, but the long-term excessive application of N fertilizer can lead to the deterioration of the soil environment, alter the properties of organic matter, and affect the adsorption and accumulation of soil pollutants. In recent years, several pollutants, especially polycyclic aromatic hydrocarbons (PAHs), have accumulated in farmland soil due to long-term sewage irrigation. However, few studies have examined the response of soil PAHs accumulation to long-term N application, as well as the relationship between this response and changes in soil microenvironmental indicators caused by N application. Here, we conducted field experiments to study changes in soil pH, total organic carbon, and dissolved organic matter (DOM) under long-term N application, as well as their effects on PAHs accumulation. The application of N fertilizer resulted in the aromatization and humification of soil DOM, enhanced the accumulation response ratio (- 0.05-0.32) and the amount of PAHs accumulated in soil (more than 30%), and exacerbated the environmental risks of PAHs. Our findings provide new insights that could aid the management and control of PAHs pollution of soil in sewageirrigated areas.