Abstract: Carbon density, storage, and distribution pattern of Phyllostachy edulis  forests in Yongan County, Fujian Province were studied under three tending measures including types Ⅰ (digging shoots, weeding, fertilizing and irrigating), Ⅱ (digging shoots, weeding and fertilizing) and Ⅲ (digging shoots and weeding). The carbon density of different bamboo organs varied from 0.3947 to 0.5619 g·g^-1 , and was in the order of rhizome > stem > branch > culm stump > leaf > root > rhizome root. The bamboos of different ages had significant differences in the carbon densities of stem, branch, leaf, and root ( P <0.01), but no significant differences in the carbon density of culm stump ( P >0.1). The average carbon density of 1-6 years old  P. edulis was 0.4579-0.4957 g·g^.-1 , and there was a decreasing trend with increasing age. Under the  management typesⅠ, Ⅱ, and Ⅲ, the total carbon storage of the forest was 227.37, 261.66 and 288.47 t·hm^-2 , and the carbon storage of bamboo layer, litter layer, and soil layer was 76.74, 64.30, and 55.91 t·hm^-2 , 2.59, 3.01, and 4.88 t·hm^-2 , and 150.64, 197.36, and 232.56 t·hm^-2 , respectively. In the total carbon storage of the forest, bamboo layer occupied 32.61% in type Ⅰ, 23.43% in type Ⅱ and 17.69% in type Ⅲ, litter layer occupied 1.14% in type Ⅰ, 1.15% in type Ⅱ and 169% in type Ⅲ, and soil layer occupied 6625% in type Ⅰ, 75.43% in type Ⅱ and 80.62% in type Ⅲ. The annual carbon fixation was in the order of type Ⅰ > type Ⅱ > type Ⅲ, and was the highest (56.47%-59.66% of the total) in bamboo stem and the lowest (2.52%-2.83%) in rhizome root.

Key words: Korqin sandy land, Spatial heterogeneity, Water content in sand layer, Pattern of plant community