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中文摘要：
对南宁市马占相思人工林3个不同年龄阶段（4，7和11年生）生态系统的碳素密度、贮量及其空间分布特征进行研究。结果表明：马占相思不同器官中碳素密度为455．4～494．5g·kg^-1，各器官碳素密度表现为：皮〉干或叶〉枝〉根；同一林分中各层次碳素密度表现为乔木层〉灌木层〉草本层；0～80cm土层中碳素密度随林龄增加而增大，且随土层深度增加而下降；3个年龄阶段马占相思人工林生态系统总碳贮量分别为117．63，176．70和202．08 t·hm^-2，其中乔木层分别占25．67％，46．10％和50．91％，灌木和草本层分别占1．82％，1．65％和1．62％，土壤层分别占69．84％，49．62％和44．59％％，凋落物层分别占2．68％，2．34％和2．88％；3个年龄阶段林分碳素年净固定量分别为10．66，15．70和12．55 t·hm^-2 a^-1，其中乔木层碳素年净固定量分别为7．54，12．14和9．36 t·hm^-2 a^-1，占林分总量的70．17％，74．14％和74．58％；凋落物层碳素年固定量分别为312，3．56和3．191 t·hm^-2 a^-1，占林分总量的70．17％，74．14％和74．58％。
英文摘要：
Carbon density, storage and spatial distribution of three different age classes（4-year-old,7-year-old and 11-year-old） of Acacia mangium plantation ecosystems were investigated in the city of Nanning, Guangxi. The results indicated that carbon density in different organs of A. mangium ranged from 455.4 g· kg^- 1 to 494.5 g·kg^-1 , which in the order as follows ： bark 〉 stem or leaf 〉 branch 〉 root. The vertical distribution of carbon density within the stand was in the following order： tree layer 〉 shrub layer 〉 herb layer. Carbon density in the 0-80 cm of soil increased with the stand age increase, and decreased with the increase of soil deepness. The total carbon storages in three age classes of A. mangium plantation ecosystems were 117.63, 176.70 and 202.08 t·hm-2, respectively. Of the total storage of carbon,25.67% - 50.91% was distributed in tree layer, 1.62% - 1.82% at herb and shrub layer,44.59%-69.84% at soil layer, only 2.68% - 2.88% at litter layer. Annual net carbon storage at three age classes of A. mangium plantation was respectively up to 10.66,15.70 and 12.55 t·hm^-2 a^-1 and 70.17%-74.58% of the total annual net carbon storage was distributed at tree layer, with the 44.59%-69.84% at little layer. Therefore, A. mangium plantation could obviously increase the carbon storage of ecosystem and prompt the potential capability of sequestrating atmospheric CO2.
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