Microplastic-contamination can reshape plant community by affecting soil properties.

Area of Science:

• Environmental Science
• Ecology
• Soil Science

Background:

• Microplastics are emerging contaminants threatening terrestrial ecosystems.
• Their impact on plant communities and underlying soil mechanisms is under-explored.

Purpose of the Study:

• To investigate the effects of polyethylene (PE) and polypropylene (PP) microplastics on plant community characteristics.
• To elucidate the mechanisms by which soil property variations influence plant communities.
• To assess the impact of microplastics on soil nutrients and plant community stability.

Main Methods:

• Establishing naturally germinated plant communities from soil seed banks.
• Analyzing changes in soil properties including salinity, available potassium (AK), total phosphorus (TP), and ammonium nitrogen (AN).
• Evaluating plant community composition, stability, niche breadth, niche overlap, and interspecific associations.

Main Results:

• Microplastics significantly increased soil available potassium (AK) and decreased salinity, total phosphorus (TP), and ammonium nitrogen (AN).
• Plant community composition shifted, leading to reduced stability and niche breadth of dominant species.
• Salinity, AK, and TP were identified as key drivers of community changes, with TP having the strongest impact.

Conclusions:

• Microplastics alter soil physicochemical properties, affecting plant community structure and function.
• Changes in soil nutrients like TP are critical in mediating microplastic impacts on plant communities.
• Findings offer insights for restoring microplastic-contaminated coastal saline-alkali wetlands.