[Effect of Low-density Polyethylene Microplastics on Soybean-soil-microbial System]

Area of Science:

• Agricultural Science
• Environmental Science
• Soil Science

Context:

• Microplastic pollution is a growing concern in terrestrial ecosystems.
• Low-density polyethylene microplastics (LDPE-MPs) are prevalent plastic pollutants.
• Understanding their impact on agroecosystems is crucial.

Purpose:

• To investigate the effects of varying LDPE-MP concentrations on soybean growth.
• To assess the impact of LDPE-MPs on soil physicochemical properties and enzyme activities.
• To analyze the changes in soil microbial community structure under microplastic stress.

Summary:

• Microplastics inhibited soybean emergence but promoted growth at high concentrations, while reducing chlorophyll content (SPAD).
• Soybean quality improved with increased sugars, proteins, and cellulose, but nutrient uptake (N, P, K) was altered.
• Soil properties changed, with increased cation exchange capacity (CEC) and soil organic matter (SOM), but decreased nitrate, available phosphorus, and available potassium.
• Microplastic stress altered microbial communities, increasing Proteobacteria and decreasing Acidobacteria, leading to reduced diversity and system instability.

Impact:

• Microplastic contamination poses significant risks to agricultural productivity and soil health.
• The study highlights the complex, concentration-dependent effects of microplastics on the soybean-soil-microbial system.
• Findings underscore the need for strategies to mitigate microplastic pollution in farmlands.