Details

Autor(en) / Beteiligte

• Yang, Xiaomei
• Bento, Célia P.M.
• Chen, Hao
• Zhang, Hongming
• Xue, Sha
• Lwanga, Esperanza Huerta
• Zomer, Paul
• Ritsema, Coen J.
• Geissen, Violette

Titel

Influence of microplastic addition on glyphosate decay and soil microbial activities in Chinese loess soil

Ist Teil von

• Environmental pollution (1987), 2018-11, Vol.242 (Pt A), p.338-347

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2018

Quelle

MEDLINE

Beschreibungen/Notizen

• The intensive use of pesticide and plastic mulches has considerably enhanced crop growth and yield. Pesticide residues and plastic debris, however, have caused serious environmental problems. This study investigated the effects of the commonly used herbicide glyphosate and micrometre-sized plastic debris, referred as microplastics, on glyphosate decay and soil microbial activities in Chinese loess soil by a microcosm experiment over 30 days incubation. Results showed that glyphosate decay was gradual and followed a single first-order decay kinetics model. In different treatments (with/without microplastic addition), glyphosate showed similar half-lives (32.8 days). The soil content of aminomethylphosphonic acid (AMPA), the main metabolite of glyphosate, steadily increased without reaching plateau and declining phases throughout the experiment. Soil microbial respiration significantly changed throughout the entirety of the experiment, particularly in the treatments with higher microplastic addition. The dynamics of soil β-glucosidase, urease and phosphatase varied, especially in the treatments with high microplastic addition. Particles that were considerably smaller than the initially added microplastic particles were observed after 30 days incubation. This result thus implied that microplastic would hardly affect glyphosate decay but smaller plastic particles accumulated in soils which potentially threaten soil quality would be further concerned especially in the regions with intensive plastic mulching application. [Display omitted] •Influence of MP on glyphosate decay and soil microbial activities were conducted.•No effect of microplastic on glyphosate degradation was observed.•Glyphosate followed SFO decay kinetics model, with 32.8 days of half-life time.•Soil microbial activities significantly changed with MP addition.•Particle sizes of MP differed significantly in this short-term incubation study. Microplastic hardly affected herbicide glyphosate decay in soil but soil microbial activities which, in turn, would indirectly influence pesticide behaviour in soil ecosystem.