Abstract: This paper studies the development and biomass of undergrowth vegetations of young-age plantations, middle-age plantations and near-mature plantations of Cupressus funebris in Yichang suburb. The results show that,from young plantations and middle-aged plantations to near-mature plantations, number of arbor species,shrub species and herbaceous species increase to a different extent, but evergreen arbor nearly not increased. dominant species of shrub layer changed from strong-masculine to relatively neutral,dominant species of herb layer changed from carex brunnea and ficus tikoua to pteridophyte. Bad regeneration of Cupressus funebris had a distincteffect on the average height and cover of shrub layer and herb layer,which increasedon the whole,but average density descended a little. Biomass of herb layer and canopy floor increased,but as a result of bad regeneration of Cupressus funebris,biomass of shrub layer descended earlier,and increased afterward.

Key words: Cupressus funebris, plantations, undergrowth vegetations, biomass, Yichang