Abstract
The farmland residual film pollution caused by traditional PE film has an adverse impact on crops and the environment. Polypropylene carbonate (PPC) film is a fully biodegradable film that can alleviate “white pollution”. In this study, the soil physicochemical properties and the composition and function of the soil community of FM (PPC film mulching) and CK (no film) treatments were determined to explore the effect of PPC film mulching on soil and the soil microbial community. Furthermore, the microorganisms at different time periods during the degradation of PPC mulch film were also analyzed. The results showed that film mulching increased soil pH but decreased the contents of EC and SOC, and there was no significant difference in the contents of AP and AK. The relative abundance of the phyla Acidobacteria was increased with film mulching, and the relative abundance of the genera MB_A2_108 also increased in the film mulched soil. Among the soil physicochemical properties, pH and SOC were the most important factors leading to changes in the composition of the bacterial and fungal communities. PPC film mulching had no significant effect on soil microbial community abundance and diversity. In addition, Pseudomonas, Flavobacterium, and Rhizobacter were dominant in the degradation of PPC film. Our research results provide a scientific theoretical basis for soil safety and the large-scale use of PPC biodegradable mulching films and a research foundation for the degradation of PPC plastics.
Highlights
Film mulching technology for farmland is an important strategy to maintain soil moisture and increase the soil temperature and crop yield [1,2]
The results showed that compared with CK, the pH value of FM was significantly
The results showed that compared with and CK,organic the pHmatter value of FM were was significantly increased (p < 0.05), the electrical conductivity of FM
Summary
Film mulching technology for farmland is an important strategy to maintain soil moisture and increase the soil temperature and crop yield [1,2]. It can effectively change the growth environment of crops, promote early maturity of crops, and increase crop yields and water use efficiency [3,4]. Plastic film residues pose a huge threat to the soil, soil microbial community, and crop growth and yield [7–9]. It was reported that the residual plastic mulch film can destroy the structure of soil aggregates and reduce soil ventilation and water permeability, and the residual film can affect the absorption of water and nutrients by plant roots and reduce root growth and overall plant productivity [10–12]. In order to reduce the pollution arising from traditional film, biodegradable film may serve as a suitable ecologically sustainable substitute
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