After the thinning,the total amounts of the undergrowth biomass were increased as the thinning was enhancing and were ranked in such order:6 th year > 2 nd year > 1 st year.

• 随着间伐强度的增大,油松林林下植物总生物量也增加,且各强度间伐的林下植物总生物量表现为间伐后第6年>第2年>第1年;