Effects of Microplastics on the Transport of Soil Dissolved Organic Matter in the Loess Plateau of China

被引:21
作者
Guo, Ziqi [1 ]
Li, Peng [2 ]
Yang, Xiaomei [3 ,4 ]
Wang, Zhanhui [5 ]
Wu, Yang [1 ]
Li, Guanwen [1 ]
Liu, Guobin [6 ,7 ]
Ritsema, Coen J. [4 ]
Geissen, Violette [4 ]
Xue, Sha [1 ,6 ,7 ]
机构
[1] Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess Pl, Yangling 712100, Peoples R China
[2] Power China, Chendu Engn Corp Ltd, Chengdu 610072, Peoples R China
[3] Northwest A&F Univ, Coll Nat Resources & Environm, Yangling 712100, Peoples R China
[4] Wageningen Univ & Res, Soil Phys & Land Management, NL-6700 AA Wageningen, Netherlands
[5] Drinking Water Safety Testing Technol Innovat Ctr, Shijiazhuang 050000, Hebei, Peoples R China
[6] Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Shaanxi 712100, Peoples R China
[7] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
基金
中国国家自然科学基金;
关键词
Microplastics; Adsorption; Dissolved organicmatter; Nutrient leaching; Soil health; CARBON; ENVIRONMENT; LIMITATION; GRASSLAND; DYNAMICS; BIOCHARS; NITROGEN; SORPTION; MODEL; WATER;
D O I
10.1021/acs.est.3c04023
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Microplastics (MPs) pollution and dissolved organic matter (DOM) affect soil quality and functions. However, the effect of MPs on DOM and underlying mechanisms have not been clarified, which poses a challenge to maintaining soil health. Under environmentally relevant conditions, we evaluated the major role of polypropylene particles at four micron-level sizes (20, 200, and 500 mu m and mixed) in regulating changes in soil DOM content. We found that an increase in soil aeration by medium and high-intensity (>0.5%) MPs may reduce NH4+ leaching by accelerating soil nitrification. However, MPs have a positive effect on soil nutrient retention through the adsorption of PO43- (13.30-34.46%) and NH4+ (9.03-19.65%) and their leached dissolved organic carbon (MP-leached dissolved organic carbon, MP-DOC), thereby maintaining the dynamic balance of soil nutrients. The regulating ion (Ca2+) is also an important competitor in the MP-DOM adsorption system, and changes in its intensity are dynamically involved in the adsorption process. These findings can help predict the response of soil processes, especially nutrient cycling, to persistent anthropogenic stressors, improve risk management policies on MPs, and facilitate the protection of soil health and function, especially in future agricultural contexts.
引用
收藏
页码:20138 / 20147
页数:10
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