Fig. 1. Schematic diagram of the experimental setup

Fig. 2. Relationship between different input powers and mass degradation rate and energy efficiency

Fig. 3. Relationship between different discharge times and mass degradation rate and energy efficiency

Fig. 4. Relationship between different number of needle tips and mass degradation rate and energy efficiency

Fig. 5. Effect of the presence or absence of air circulation on degradation efficiency

Fig. 6. Effect of the presence or absence of air circulation on degradation efficiency at different input powers

Fig. 7. Microscopic morphology before and after mulch treatment: (a) without treatment; (b) normal plasma treatment

Fig. 8. Mechanical properties before and after membrane treatment: (a) pretreatment; (b) after treatment

Fig. 9. Raman spectra before and after mulch treatment (color online)

Fig. 10. Needle tip diagram after mulch treatment

Fig. 11. Viscosity measurement curves before and after film treatment: (a) pretreatment; (b) after treatment