A Study on Biomass Dynamics and Distribution of Undervegetation in the Secondary Generation of Chinese Fir Plantation in Hui Tong

The biomass of undervegetation in the secondary generation of Chinese fir plantation at fast growing stage was studied for 2 years at Hui Tong.Biomass in undervegetation shrubs, herbs was discussed. In the light of specific conditions of biomass of undervegetation in the secondary generation of young Chinese fir plantation, the biomass dynamics of living undervegetation in the secondary generation of Chinese fir plantation were analyzed. The results showed that the biomass of undervegetation shrubs and herbs in 13 year old Chinese fir stand were 521.89 kg·hm-2and 1 429.71kg·hm-2.The biomass of undervegetation shrubs and herbs in 14 year old Chinese fir stand were 372.69 kg·hm-2and 897.10 kg·hm-2.In the 2 years, the biomass orders of shrub all was rootstemleaf, while the biomass order of herb was under ground partabove ground part.The biomass of living undervegetation is the largest,3 089.62 kg·hm-2 in 5 year old. The biomass of living undervegetation is smallest,1 269.79 kg·hm-2in 14 year old.