Biomass and efficiency of radiation utilization in monsoon evergreen broadleaved forest in Dinghushan biosphere reserve

The biomass, productivity and efficiency of radiation utilization in Cryptocarya concinna community in Dinghushan Biosphere Reserve were investigated.The biomass, photosynthetic rate and respiration rate were measured by harvesting the sample plants of the main species in several layers and by CO2 infra-red analysis. After ward,the productivity and the efficiency of radiation utilization were calculated. The results show that the biomass, gross primary productivity and net primary productivity in the community were 208 t · hm^-2, 128704 kJ · m^-2 · a^-1 and 30451 kJ · m^-2 · a^-1,respectively the utilization efficiency of available radiation for gross primary productivity and net primary productivity were 9.66% and 2.29%, respectively. These results explain the potential productivity of the forest community in southern subtropical zone. (author)