36年生顶果木人工林生态系统碳密度及其分配格局

摘要

The carbon content, accumulation and distribution of 36-year-old standing forest of Acrocarpus fraxinifo-lius plantation ecosystem was studied in Guangxi State-owned Weidu Forestry Farm, Laibin City.The results showed that the average carbon content in different organs of the tree layer was 501.7 g/kg, ranged from 483.40 g/kg to 516.95 g/kg, with the order of leaf >trunk >root tip>coarse root>dead branch>middle root>flesh branch>fine root>bark.The total carbon density in Acrocarpus fraxinifolius plantation ecosystem was 554.89 t · c/hm2 , tree layer and soil layer were the main carbon pool, both reached 406.60 t· c/hm2 , 143.72 t· c/hm2 , respec-tively;different gradations showed tree layer (account for 73.28%of the total) >soil layer (25.90%) >shrub lay-er (0.55 %) >litter layer (0.25%) >herb layer (0.02%) .The annual carbon fixation of Acrocarpus fraxinifoli-us plantation was 32.18 t· c/(hm2· a), and net carbon accumulation was 11.29 t· c /(hm2· a), being relat-ed with high carbon sequestration ability.%对广西来宾市维都林场36年生顶果木人工林生态系统碳含量、碳密度及其分配格局进行了研究。结果表明，乔木层不同器官平均碳含量为501.7 g／kg，介于483.40～516.95 g／kg之间，表现为：树叶＞树干＞根兜＞粗根＞枯枝＞中根＞鲜枝＞细根＞树皮；生态系统碳密度为554.89 t· c／hm2，其中乔木层和土壤层为主要的碳库，分别为406.60 t· c／hm2、143.72 t· c／hm2；不同层次表现为乔木层（占总量73.28％）＞土壤层（25.90％）＞灌木层（0.55％）＞凋落物层（0.25％）＞草本层（0.02％）。顶果木年净固碳量为32.18 t· c／（hm2· a），净碳素累积量为11.29 t· c／（hm2· a），具有很高的固碳能力。