卷荚相思人工林碳库及其分配特征

Stock and Distribution of Carbon in Acacia cincinnata Plantation

通过样地调查,对广西南宁市8年生卷荚相思Acacia cincinnata人工林碳库及其分配特征进行了研究.结果表明,卷荚相思不同器官碳素质量分数为465.8～508.2 g.kg-1,各器官碳素含量排序为树干>树叶>树枝>树根>树皮.灌木层、草本层和现存凋落物层碳素质量分数分别为460.8、430.9和468.1 g/kg,土壤层(0～80 cm)碳素质量分数为8.44 g.kg-1,随土层深度增加土壤碳素含量减少.卷荚相思人工林生态系统总碳库为126.07 t.hm-2,其中乔木层为28.76 t.hm-2,灌木层为5.35 t.hm-2,草本层为1.25 t.hm-2,现存凋落物层为1.69 t.hm-2,土壤层(0～80 cm)为89.02 t.hm-2.卷荚相思人工林年净生产力为10.15 t.hm-2.a-1,碳素年净固定量为5.64t.hm-2.a-1.

Carbon stock and the distribution of an 8-year-old Acacia cincinnata plantation in Nanning,Guangxi,China,were investigated based on field sampling data.The results showed that carbon content in different organs of A.cincinnata ranged from 465.8 to 508.2 g.kg^-1,and it was distributed in a descending order as follows： stem leaf branch root bark.Carbon content in the soil（0-80 cm） was 8.44 g.kg^-1 which declined with soil depth.The carbon stock in A.cincinnata plantation ecosystems was 126.07 t.hm^-2,which distributed among the tree layer with a stock of 28.76 t.hm^-2,shrub layer 5.35 t.hm^-2,herbaceous layer 1.25 t.hm^-2,litters 1.69 t.hm^-2,and the soil layer（0-80 cm） 89.02 t.hm^-2.Annual net productivity of A.cincinnata plantation was 10.15 t.hm^-2.a-1,and annual carbon storage was up to 5.64 t.hm^-2.a-1.