The effect of plastic cover was not significant in both soils. The sequencing of MBP was TS>NTS>NTP>NT>TP>T in the depth of 0-5cm and NTP>TS>NTS>NT>T>TP in the depth of 5-10cm.

• 0-5cm土层，土壤微生物量磷均值排序：TS>NTS>NTP>NT>TP>T，NTS与T之间、TS与T之间差异显著，其余差异不显著；