10年生灰木莲人工林碳库及其分配特征

为了解灰木莲人工林碳素累积能力，通过野外调查和实验室分析，对广西南宁市10年生灰木莲人工林的碳库及其分配格局进行了研究。结果表明，灰木莲不同器官碳素含量在470.0~532.1 g/kg之间，不同器官碳素含量排列次序为干材>树根>树枝>干皮>树叶。凋落物层碳素含量为493.2 g/kg。土壤（0~80 cm）中碳素含量为8.53 g/kg，随土壤深度的增加而明显下降。灰木莲人工林碳库为138.49 t/hm2，其中乔木层为49.04 t/hm2，占35.41%；凋落物层为4.40 t/hm2，占3.18%；土壤层为85.05 t/hm2，占61.41%。10年生灰木莲人工林年净生产力为11.62 t/(hm2？a)，碳素年净固定量为5.81 t/(hm2？a)，折合成CO2的量为21.29 t/(hm2？a)。认为，灰木莲可以作为碳汇功能高效的生态公益木材树种。
To understund the properties of carbon accumulation, we studied the carbon stock and the distribution in Mang？？lietia glauca plantation at 10？？year？？old in Nanning, Guangxi Province. The results showed that carbon content in different organs of M.glauca was 470.0 g/kg to 532.1 g/kg, which was in the order as follows: stem>root>branch>bark>leaf. Carbon content was 493.2 g/kg in litter floor, 8.53 g/kg in the soil（0-80 cm）and obviously declined with increased soil depth from 0 to 80 cm. The carbon stock in M.glauca plantation at fast growing stage was 138.49 t/hm2 , divided among the tree layer with 49.04 t/hm2 (35.41%), litter 4.40 t/hm2 (3.18%), and soil (0-80 cm) 8.53 t/hm2 (3.18%). The annual net productivity in the tree layer of M.glauca plantation at fast growing stage was 11.62 t/(hm2？a), annual net carbon fixation was up to 5.81 t/(hm2？a), amounted CO2 to 21.29 t/(hm2？a).M.glauca could be planted as ecological plantation with efficient carbon sink