对间伐后杉木人工林生态系统生物产量的动态变化的研究结果表明：间伐后生态系统生物量由对照的１８０．０５ｔ／ｈｍ２减少至１５６．５８ｔ／ｈｍ２，减少１３．０４％．系统生物量的减少主要是因为乔木层林木株数、生物量减少所致，乔木层生物量由对照的１７３．８７ｔ／ｈｍ２减少至１４２．７４ｔ／ｈｍ２，减少１７．９０％；但单株木的生物量增加了６４．０７％，尤以枝、叶和根增长迅速；林下植被生物量、死地被物生物量也大大超过对照林分，分别是对照的３．２５倍和１．９３倍 The results of the dynamic changes of biomass of Cunninghamia lanceolata plantation ecosystems after thinning indicated that the biomass of thinned ecosystem decreased from 180.05 t / hm2 to 156.58 t / hm2, a decrease of 13.04%. The reduction of biomass was mainly due to the reduction of the number of trees and biomass in the arbor layer. The biomass of arbor layer decreased from 173.87t / hm2 to 142.74t / hm2 in the control, decreasing by 17.90% The biomass increased 64.07%, especially in branches, leaves and roots. The biomass of understory vegetation and the biomass of dead plants also greatly exceeded the control stands, which were 3.25 times and 1.93 times of that of control respectively