10年生灰木莲人工林碳库及其分配特征

Carbon stock and distribution in 10-year-old Manglietia glauca plantation

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/hm^2,其中乔木层为49.04 t/hm^2,占35.41%;凋落物层为4.40 t/hm^2,占3.18%;土壤层为85.05 t/hm^2,占61.41%。10年生灰木莲人工林年净生产力为11.62 t/（hm^2·a）,碳素年净固定量为5.81 t/（hm^2·a）,折合成CO2的量为21.29 t/（hm^2·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 Manglietia 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 / hm^2,divided among the tree layer with 49. 04 t / hm^2（ 35. 41%）,litter 4. 40 t/hm^2（ 3. 18%）,and soil（ 0-80 cm） 8. 53 t/hm^2（ 3. 18%）. The annual net productivity in the tree layer of M. glauca plantation at fast growing stage was 11. 62 t /（ hm^2·a）,annual net carbon fixation was up to 5. 81 t /（ hm^2·a）,amounted CO2 to 21. 29 t /（ hm^2·a）. M. glauca could be planted as ecological plantation with efficient carbon sink.