对杉木人工林间伐后林下植被生物量的变化进行测算分析,结果表明,间伐以后,由于林下空间环境因子的变化,植被生物量大量增加,为对照区的3.25倍其中灌木生物量增加273.5％,由对照区占林下植被总生物量的79.78％,提高到91.75％.且灌木种类增多,并尤以层外植物较多.其生物量占灌木生物量的50.25％;草本生物量增加32.49％;林下死地被物生物量达9100kg／hm2,比对照区增加92.80％。 The results showed that after the thinning, the biomass of vegetation increased greatly, which was 3.25 times of that in the control area, in which the shrub biomass increased by 273.5 %, Accounting for 79.78% of the total biomass of undergrowth in the control area, up to 91.75% .And shrub species increased, especially in the extra-plant more than its biomass accounted for 50.25% of the shrub biomass; Herb biomass increased 32.49%. The biomass of under-parcels was 9100kg / hm2, which was 92.80% higher than the control.