Effects of different tending measures on carbon density,storage,and allocation pattern of Phyllostachy edulis forests in western Fujian Province

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 (P0.01),but no significant differences in the carbon density of culm stump (P0.1). 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 1.69% in type Ⅲ,and soil layer occupied 66.25% 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.