Abstract:The purpose was to comprehend the dynamic changes in carbon and nitrogen storage of Phyllostachys edulis forest with rhizome expansion, the changes in carbon and nitrogen storage of P. edulis forest in Yong'an City, Fujian Province were studied with abandoned land and 14-year-old Chinese fir (Cunninghamia lanceolata) forest as control. The results showed that the carbon and nitrogen storage of forest was higher significantly than that of abandoned land. The carbon storage of P. edulis forest deceased firstly and then increased quickly when Chinese fir transformed into moso bamboo. The carbon storage reached the maximum when moso bamboo forest was 10 years old, and then decreased with age increasing. The change trend of carbon storage was difference from that of nitrogen storage. The nitrogen storage of moso bamboo forest with more than 10-year-old was higher significantly than that of 14-year-old Chinese fir, and the nitrogen storage of moso bamboo forest at the age of 5 were lower significantly than that of Chinese fir. The carbon and nitrogen storages of all forest types were in the order: soil layer > tree layer > litter-fall layer > vegetation layer under canopy. Meanwhile, the carbon and nitrogen storages in soil layer decreased while those in tree layer increased. The carbon and nitrogen storages in litter-fall of moso bamboo were higher than those in abandoned land, and lower than those in Chinese fir forest. Meanwhile, the carbon and nitrogen storages in litter-fall of moso bamboo forest decreased with stand age increasing. The low carbon and nitrogen storages in litter-fall of moso bamboo forest may decline continued carbon sequestration capacity. So, it was important to balance the carbon and nitrogen storages between tree layer and soil layer.